What is the best way to write this equation to have a better look?












2















What is the best way to write the following equation:



begin{flalign} 
begin{aligned}
&qquadqquadfrac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=\
&sum_{i=1}^{N-N^*} Bigg(bigg[sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i}bigg]\
&-bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} bigg]Bigg)\
&-sum_{i=1}^{N^*} sum_{j=2}^{n_i}bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
end{aligned}
&&
end{flalign}


Following is an image to how it looks like in the way I wrote the code above



enter image description here



I tried also to use multiline but did not get a nice look either.



I change the code using footnotesize, the new code is



{footnotesize
begin{flalign} label{18}
begin{aligned}
frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}&=sum_{i=1}^{N-N^*} Bigg(bigg[sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i}bigg]\
&qquad-bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} bigg]Bigg)\
&qquad-sum_{i=1}^{N^*} sum_{j=2}^{n_i}bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
end{aligned}
&&
end{flalign}
}


It looks now as:
enter image description here










share|improve this question




















  • 2





    Please do not post code snippets - create minimal working examples (MWEs) instead.

    – epR8GaYuh
    Dec 18 '18 at 13:29











  • I post it as it is because the equation is splitted in many line. I can't compile the above code here to show how it is very messy

    – N. I. ElZayat
    Dec 18 '18 at 13:33






  • 1





    Please state, in words, what you would like to achieve. Please also state what the main font size is and how wide the text block is.

    – Mico
    Dec 18 '18 at 13:37








  • 1





    Do you use the default layout (with a very large outer margin) or do you customise your layout (say with geometry)?

    – Bernard
    Dec 18 '18 at 13:54








  • 2





    The combination of footnotesize and tfrac makes reading the material quite a chore -- unless a free magnifying glass is handed out...

    – Mico
    Dec 18 '18 at 15:06
















2















What is the best way to write the following equation:



begin{flalign} 
begin{aligned}
&qquadqquadfrac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=\
&sum_{i=1}^{N-N^*} Bigg(bigg[sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i}bigg]\
&-bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} bigg]Bigg)\
&-sum_{i=1}^{N^*} sum_{j=2}^{n_i}bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
end{aligned}
&&
end{flalign}


Following is an image to how it looks like in the way I wrote the code above



enter image description here



I tried also to use multiline but did not get a nice look either.



I change the code using footnotesize, the new code is



{footnotesize
begin{flalign} label{18}
begin{aligned}
frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}&=sum_{i=1}^{N-N^*} Bigg(bigg[sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i}bigg]\
&qquad-bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} bigg]Bigg)\
&qquad-sum_{i=1}^{N^*} sum_{j=2}^{n_i}bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
end{aligned}
&&
end{flalign}
}


It looks now as:
enter image description here










share|improve this question




















  • 2





    Please do not post code snippets - create minimal working examples (MWEs) instead.

    – epR8GaYuh
    Dec 18 '18 at 13:29











  • I post it as it is because the equation is splitted in many line. I can't compile the above code here to show how it is very messy

    – N. I. ElZayat
    Dec 18 '18 at 13:33






  • 1





    Please state, in words, what you would like to achieve. Please also state what the main font size is and how wide the text block is.

    – Mico
    Dec 18 '18 at 13:37








  • 1





    Do you use the default layout (with a very large outer margin) or do you customise your layout (say with geometry)?

    – Bernard
    Dec 18 '18 at 13:54








  • 2





    The combination of footnotesize and tfrac makes reading the material quite a chore -- unless a free magnifying glass is handed out...

    – Mico
    Dec 18 '18 at 15:06














2












2








2








What is the best way to write the following equation:



begin{flalign} 
begin{aligned}
&qquadqquadfrac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=\
&sum_{i=1}^{N-N^*} Bigg(bigg[sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i}bigg]\
&-bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} bigg]Bigg)\
&-sum_{i=1}^{N^*} sum_{j=2}^{n_i}bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
end{aligned}
&&
end{flalign}


Following is an image to how it looks like in the way I wrote the code above



enter image description here



I tried also to use multiline but did not get a nice look either.



I change the code using footnotesize, the new code is



{footnotesize
begin{flalign} label{18}
begin{aligned}
frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}&=sum_{i=1}^{N-N^*} Bigg(bigg[sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i}bigg]\
&qquad-bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} bigg]Bigg)\
&qquad-sum_{i=1}^{N^*} sum_{j=2}^{n_i}bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
end{aligned}
&&
end{flalign}
}


It looks now as:
enter image description here










share|improve this question
















What is the best way to write the following equation:



begin{flalign} 
begin{aligned}
&qquadqquadfrac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=\
&sum_{i=1}^{N-N^*} Bigg(bigg[sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i}bigg]\
&-bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} bigg]Bigg)\
&-sum_{i=1}^{N^*} sum_{j=2}^{n_i}bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
end{aligned}
&&
end{flalign}


Following is an image to how it looks like in the way I wrote the code above



enter image description here



I tried also to use multiline but did not get a nice look either.



I change the code using footnotesize, the new code is



{footnotesize
begin{flalign} label{18}
begin{aligned}
frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}&=sum_{i=1}^{N-N^*} Bigg(bigg[sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i}bigg]\
&qquad-bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} bigg]Bigg)\
&qquad-sum_{i=1}^{N^*} sum_{j=2}^{n_i}bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
end{aligned}
&&
end{flalign}
}


It looks now as:
enter image description here







equations






share|improve this question















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edited Dec 18 '18 at 14:05







N. I. ElZayat

















asked Dec 18 '18 at 13:25









N. I. ElZayatN. I. ElZayat

515




515








  • 2





    Please do not post code snippets - create minimal working examples (MWEs) instead.

    – epR8GaYuh
    Dec 18 '18 at 13:29











  • I post it as it is because the equation is splitted in many line. I can't compile the above code here to show how it is very messy

    – N. I. ElZayat
    Dec 18 '18 at 13:33






  • 1





    Please state, in words, what you would like to achieve. Please also state what the main font size is and how wide the text block is.

    – Mico
    Dec 18 '18 at 13:37








  • 1





    Do you use the default layout (with a very large outer margin) or do you customise your layout (say with geometry)?

    – Bernard
    Dec 18 '18 at 13:54








  • 2





    The combination of footnotesize and tfrac makes reading the material quite a chore -- unless a free magnifying glass is handed out...

    – Mico
    Dec 18 '18 at 15:06














  • 2





    Please do not post code snippets - create minimal working examples (MWEs) instead.

    – epR8GaYuh
    Dec 18 '18 at 13:29











  • I post it as it is because the equation is splitted in many line. I can't compile the above code here to show how it is very messy

    – N. I. ElZayat
    Dec 18 '18 at 13:33






  • 1





    Please state, in words, what you would like to achieve. Please also state what the main font size is and how wide the text block is.

    – Mico
    Dec 18 '18 at 13:37








  • 1





    Do you use the default layout (with a very large outer margin) or do you customise your layout (say with geometry)?

    – Bernard
    Dec 18 '18 at 13:54








  • 2





    The combination of footnotesize and tfrac makes reading the material quite a chore -- unless a free magnifying glass is handed out...

    – Mico
    Dec 18 '18 at 15:06








2




2





Please do not post code snippets - create minimal working examples (MWEs) instead.

– epR8GaYuh
Dec 18 '18 at 13:29





Please do not post code snippets - create minimal working examples (MWEs) instead.

– epR8GaYuh
Dec 18 '18 at 13:29













I post it as it is because the equation is splitted in many line. I can't compile the above code here to show how it is very messy

– N. I. ElZayat
Dec 18 '18 at 13:33





I post it as it is because the equation is splitted in many line. I can't compile the above code here to show how it is very messy

– N. I. ElZayat
Dec 18 '18 at 13:33




1




1





Please state, in words, what you would like to achieve. Please also state what the main font size is and how wide the text block is.

– Mico
Dec 18 '18 at 13:37







Please state, in words, what you would like to achieve. Please also state what the main font size is and how wide the text block is.

– Mico
Dec 18 '18 at 13:37






1




1





Do you use the default layout (with a very large outer margin) or do you customise your layout (say with geometry)?

– Bernard
Dec 18 '18 at 13:54







Do you use the default layout (with a very large outer margin) or do you customise your layout (say with geometry)?

– Bernard
Dec 18 '18 at 13:54






2




2





The combination of footnotesize and tfrac makes reading the material quite a chore -- unless a free magnifying glass is handed out...

– Mico
Dec 18 '18 at 15:06





The combination of footnotesize and tfrac makes reading the material quite a chore -- unless a free magnifying glass is handed out...

– Mico
Dec 18 '18 at 15:06










4 Answers
4






active

oldest

votes


















8














Do six lines. I changed the position of some of the brackets from before to after the summation sign and reduced the size.



Note that it should be bigl for a left delimiter and bigr for a right one (with the obvious variations for Big, bigg and Bigg).



documentclass{article}
usepackage{amsmath,bm}

begin{document}

begin{flalign}
begin{aligned}
frac{partial^2 ell}{partial bm{phi},partialbm{phi}'}={}&
begin{aligned}[t]
sum_{i=1}^{N-N^*}
biggl(,sum_{j=2}^{d_i-1}Bigl[
& -frac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}
{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}
tilde{mathbf{Y}}_j tilde{mathbf{Y}}'_j
\
& +frac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}
{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
tilde{mathbf{Y}}_{d_i} tilde{mathbf{Y}}'_{d_i}Bigr]
\
-sum_{j=2}^{d_i-1}Bigl[
& frac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
tilde{mathbf{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) tilde{mathbf{Y}}'_j
\
& +frac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
tilde{mathbf{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) tilde{mathbf{Y}}'_{d_i} Bigr]biggr)
end{aligned}
\
&begin{aligned}[t]
-sum_{i=1}^{N^*} sum_{j=2}^{n_i}Bigl[
& frac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}
{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}
tilde{mathbf{Y}}_j tilde{mathbf{Y}}'_j
\
& + frac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
tilde{mathbf{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) tilde{mathbf{Y}}'_jBigr]
end{aligned}
end{aligned}
&&
end{flalign}

end{document}


enter image description here



I changed all mathbf{tilde{Y}} to tilde{mathbf{Y}} that's conceptually sounder. You may also want to use widetilde, but I don't recommend so.






share|improve this answer





















  • 2





    I'd be tempted to replace all instances of mathbf{tilde{Y}} with widetilde{mathbf{Y}}.

    – Mico
    Dec 18 '18 at 14:14






  • 3





    @Mico It should be tilde{mathbf{Y}}, much likely.

    – egreg
    Dec 18 '18 at 14:16











  • Nice touch to supply the missing inner brackets, by the way.

    – Mico
    Dec 18 '18 at 14:18











  • @egreg it is really looks very nice

    – N. I. ElZayat
    Dec 18 '18 at 14:32



















3














Reduce the text size or make it spread into several lines.



begin{flalign}
{footnotesize
begin{aligned}
frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=
&sum_{i=1}^{N-N^*} Bigg(bigg[sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}\&
mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i}bigg]
-bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} bigg]Bigg)\
&-sum_{i=1}^{N^*} sum_{j=2}^{n_i}bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
end{aligned}}
end{flalign}





share|improve this answer



















  • 1





    I just notice your answer, this is exactly what comes to my mind before I saw you answer

    – N. I. ElZayat
    Dec 18 '18 at 14:06






  • 1





    And you remembered to check the log before you posted this? Hint: footnotesize is not allowed in math mode.

    – daleif
    Dec 18 '18 at 14:08






  • 3





    No error is not the same as not being correct. You get LaTeX Font Warning: Command footnotesize invalid in math mode if you look in the log. Never use text font resizing commands in math mode.

    – daleif
    Dec 18 '18 at 14:16








  • 2





    It is still a bad practise that should be avoided in a good document design.

    – daleif
    Dec 18 '18 at 14:47






  • 2





    Shrinking the font to make something fit is a bad idea regardless.

    – JPi
    Dec 18 '18 at 17:04



















3














enter image description here



I've made the code a bit more legible and changed Bigg( to Biggl( etc. Also, I'm using the multline environment from amsmath which is suitable here.



documentclass{article}

usepackage{amsmath}
usepackage{bm}
usepackage[margin=1in]{geometry}

newcommand{bP}{bm{P}}
newcommand{tY}{mathbf{tilde Y}}
begin{document}
begin{multline}
frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=
sum_{i=1}^{N-N^*} Biggl(biggl[sum_{j=2}^{d_i-1} -;frac{bP_{ij}'bP_{ij} (1-bP_{ij})'}{(1-bP_{ij})'(1-bP_{ij})+bP_{ij}'bP_{ij}}tY_j tY'_j + frac{bP_{id_i}'(1-bP_{id_i})'(1-bP_{id_i})}{(1-bP_{id_i})'(1-bP_{id_i})+bP_{id_i}'bP_{id_i}}
tY_{d_i} tY'_{d_i}biggr]\
-biggl[sum_{j=2}^{d_i-1} frac{bP_{ij}}{(1-bP_{ij})'}
tY_j bP_{ij}(1-bP_{ij}) tY'_j+frac{(1-bP_{id_i})}{bP'_{id_i}}
tY_{d_i} bP_{id_i}(1-bP_{id_i}) tY'_{d_i} biggr]Biggr)\
-sum_{i=1}^{N^*} sum_{j=2}^{n_i}biggl[frac{bP_{ij}'bP_{ij} (1-bP_{ij})'}{(1-bP_{ij})'(1-bP_{ij})+bP_{ij}'bP_{ij}}tY_j tY'_j + frac{bP_{ij}}{(1-bP_{ij})'}
tY_j bP_{ij}(1-bP_{ij}) tY'_jbiggr]
end{multline}

end{document}





share|improve this answer































    2














    I propose this, with package geometry. If you have the default layout with large margins, you can nest the equation contents in a medsize environment from nccmath (~ 80% of previous size):



    documentclass{article}
    usepackage{geometry}
    usepackage{showframe}
    renewcommand{ShowFrameLinethickness}{0.3pt}
    usepackage{amsmath, bm, nccmath}
    usepackage{diffcoeff}

    begin{document}

    begin{equation}
    begin{aligned}diffp[1,1]{ell}{bm{phi},bm{phi}'} =
    sum_{i=1}^{N-N^*} Bigg( & bigg[begin{aligned}[t]sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'
    bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
    mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i} & bigg]\
    %&
    - bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
    mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
    mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} &bigg]Bigg)
    end{aligned}\
    % &
    -sum_{i=1}^{N^*} sum_{j=2}^{n_i} & bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
    mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
    end{aligned}
    end{equation}
    bigskip

    begin{equation}
    begin{medsize}
    begin{aligned}diffp[1,1]{ell}{bm{phi},bm{phi}'} =
    sum_{i=1}^{N-N^*} Biggl( & Biggl[begin{aligned}[t]sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'
    bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
    mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i} & Biggr]\
    %&
    - Biggl[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
    mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
    mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} &Biggr]Biggr)
    end{aligned}\
    % &
    -sum_{i=1}^{N^*} sum_{j=2}^{n_i} & biggl[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
    mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbiggr]
    end{aligned}
    end{medsize}
    end{equation}

    end{document}





    share|improve this answer























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      4 Answers
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      4 Answers
      4






      active

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      8














      Do six lines. I changed the position of some of the brackets from before to after the summation sign and reduced the size.



      Note that it should be bigl for a left delimiter and bigr for a right one (with the obvious variations for Big, bigg and Bigg).



      documentclass{article}
      usepackage{amsmath,bm}

      begin{document}

      begin{flalign}
      begin{aligned}
      frac{partial^2 ell}{partial bm{phi},partialbm{phi}'}={}&
      begin{aligned}[t]
      sum_{i=1}^{N-N^*}
      biggl(,sum_{j=2}^{d_i-1}Bigl[
      & -frac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}
      {(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}
      tilde{mathbf{Y}}_j tilde{mathbf{Y}}'_j
      \
      & +frac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}
      {(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
      tilde{mathbf{Y}}_{d_i} tilde{mathbf{Y}}'_{d_i}Bigr]
      \
      -sum_{j=2}^{d_i-1}Bigl[
      & frac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      tilde{mathbf{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) tilde{mathbf{Y}}'_j
      \
      & +frac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
      tilde{mathbf{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) tilde{mathbf{Y}}'_{d_i} Bigr]biggr)
      end{aligned}
      \
      &begin{aligned}[t]
      -sum_{i=1}^{N^*} sum_{j=2}^{n_i}Bigl[
      & frac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}
      {(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}
      tilde{mathbf{Y}}_j tilde{mathbf{Y}}'_j
      \
      & + frac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      tilde{mathbf{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) tilde{mathbf{Y}}'_jBigr]
      end{aligned}
      end{aligned}
      &&
      end{flalign}

      end{document}


      enter image description here



      I changed all mathbf{tilde{Y}} to tilde{mathbf{Y}} that's conceptually sounder. You may also want to use widetilde, but I don't recommend so.






      share|improve this answer





















      • 2





        I'd be tempted to replace all instances of mathbf{tilde{Y}} with widetilde{mathbf{Y}}.

        – Mico
        Dec 18 '18 at 14:14






      • 3





        @Mico It should be tilde{mathbf{Y}}, much likely.

        – egreg
        Dec 18 '18 at 14:16











      • Nice touch to supply the missing inner brackets, by the way.

        – Mico
        Dec 18 '18 at 14:18











      • @egreg it is really looks very nice

        – N. I. ElZayat
        Dec 18 '18 at 14:32
















      8














      Do six lines. I changed the position of some of the brackets from before to after the summation sign and reduced the size.



      Note that it should be bigl for a left delimiter and bigr for a right one (with the obvious variations for Big, bigg and Bigg).



      documentclass{article}
      usepackage{amsmath,bm}

      begin{document}

      begin{flalign}
      begin{aligned}
      frac{partial^2 ell}{partial bm{phi},partialbm{phi}'}={}&
      begin{aligned}[t]
      sum_{i=1}^{N-N^*}
      biggl(,sum_{j=2}^{d_i-1}Bigl[
      & -frac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}
      {(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}
      tilde{mathbf{Y}}_j tilde{mathbf{Y}}'_j
      \
      & +frac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}
      {(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
      tilde{mathbf{Y}}_{d_i} tilde{mathbf{Y}}'_{d_i}Bigr]
      \
      -sum_{j=2}^{d_i-1}Bigl[
      & frac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      tilde{mathbf{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) tilde{mathbf{Y}}'_j
      \
      & +frac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
      tilde{mathbf{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) tilde{mathbf{Y}}'_{d_i} Bigr]biggr)
      end{aligned}
      \
      &begin{aligned}[t]
      -sum_{i=1}^{N^*} sum_{j=2}^{n_i}Bigl[
      & frac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}
      {(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}
      tilde{mathbf{Y}}_j tilde{mathbf{Y}}'_j
      \
      & + frac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      tilde{mathbf{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) tilde{mathbf{Y}}'_jBigr]
      end{aligned}
      end{aligned}
      &&
      end{flalign}

      end{document}


      enter image description here



      I changed all mathbf{tilde{Y}} to tilde{mathbf{Y}} that's conceptually sounder. You may also want to use widetilde, but I don't recommend so.






      share|improve this answer





















      • 2





        I'd be tempted to replace all instances of mathbf{tilde{Y}} with widetilde{mathbf{Y}}.

        – Mico
        Dec 18 '18 at 14:14






      • 3





        @Mico It should be tilde{mathbf{Y}}, much likely.

        – egreg
        Dec 18 '18 at 14:16











      • Nice touch to supply the missing inner brackets, by the way.

        – Mico
        Dec 18 '18 at 14:18











      • @egreg it is really looks very nice

        – N. I. ElZayat
        Dec 18 '18 at 14:32














      8












      8








      8







      Do six lines. I changed the position of some of the brackets from before to after the summation sign and reduced the size.



      Note that it should be bigl for a left delimiter and bigr for a right one (with the obvious variations for Big, bigg and Bigg).



      documentclass{article}
      usepackage{amsmath,bm}

      begin{document}

      begin{flalign}
      begin{aligned}
      frac{partial^2 ell}{partial bm{phi},partialbm{phi}'}={}&
      begin{aligned}[t]
      sum_{i=1}^{N-N^*}
      biggl(,sum_{j=2}^{d_i-1}Bigl[
      & -frac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}
      {(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}
      tilde{mathbf{Y}}_j tilde{mathbf{Y}}'_j
      \
      & +frac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}
      {(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
      tilde{mathbf{Y}}_{d_i} tilde{mathbf{Y}}'_{d_i}Bigr]
      \
      -sum_{j=2}^{d_i-1}Bigl[
      & frac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      tilde{mathbf{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) tilde{mathbf{Y}}'_j
      \
      & +frac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
      tilde{mathbf{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) tilde{mathbf{Y}}'_{d_i} Bigr]biggr)
      end{aligned}
      \
      &begin{aligned}[t]
      -sum_{i=1}^{N^*} sum_{j=2}^{n_i}Bigl[
      & frac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}
      {(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}
      tilde{mathbf{Y}}_j tilde{mathbf{Y}}'_j
      \
      & + frac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      tilde{mathbf{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) tilde{mathbf{Y}}'_jBigr]
      end{aligned}
      end{aligned}
      &&
      end{flalign}

      end{document}


      enter image description here



      I changed all mathbf{tilde{Y}} to tilde{mathbf{Y}} that's conceptually sounder. You may also want to use widetilde, but I don't recommend so.






      share|improve this answer















      Do six lines. I changed the position of some of the brackets from before to after the summation sign and reduced the size.



      Note that it should be bigl for a left delimiter and bigr for a right one (with the obvious variations for Big, bigg and Bigg).



      documentclass{article}
      usepackage{amsmath,bm}

      begin{document}

      begin{flalign}
      begin{aligned}
      frac{partial^2 ell}{partial bm{phi},partialbm{phi}'}={}&
      begin{aligned}[t]
      sum_{i=1}^{N-N^*}
      biggl(,sum_{j=2}^{d_i-1}Bigl[
      & -frac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}
      {(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}
      tilde{mathbf{Y}}_j tilde{mathbf{Y}}'_j
      \
      & +frac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}
      {(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
      tilde{mathbf{Y}}_{d_i} tilde{mathbf{Y}}'_{d_i}Bigr]
      \
      -sum_{j=2}^{d_i-1}Bigl[
      & frac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      tilde{mathbf{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) tilde{mathbf{Y}}'_j
      \
      & +frac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
      tilde{mathbf{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) tilde{mathbf{Y}}'_{d_i} Bigr]biggr)
      end{aligned}
      \
      &begin{aligned}[t]
      -sum_{i=1}^{N^*} sum_{j=2}^{n_i}Bigl[
      & frac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}
      {(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}
      tilde{mathbf{Y}}_j tilde{mathbf{Y}}'_j
      \
      & + frac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      tilde{mathbf{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) tilde{mathbf{Y}}'_jBigr]
      end{aligned}
      end{aligned}
      &&
      end{flalign}

      end{document}


      enter image description here



      I changed all mathbf{tilde{Y}} to tilde{mathbf{Y}} that's conceptually sounder. You may also want to use widetilde, but I don't recommend so.







      share|improve this answer














      share|improve this answer



      share|improve this answer








      edited Dec 18 '18 at 14:18

























      answered Dec 18 '18 at 14:08









      egregegreg

      721k8719113210




      721k8719113210








      • 2





        I'd be tempted to replace all instances of mathbf{tilde{Y}} with widetilde{mathbf{Y}}.

        – Mico
        Dec 18 '18 at 14:14






      • 3





        @Mico It should be tilde{mathbf{Y}}, much likely.

        – egreg
        Dec 18 '18 at 14:16











      • Nice touch to supply the missing inner brackets, by the way.

        – Mico
        Dec 18 '18 at 14:18











      • @egreg it is really looks very nice

        – N. I. ElZayat
        Dec 18 '18 at 14:32














      • 2





        I'd be tempted to replace all instances of mathbf{tilde{Y}} with widetilde{mathbf{Y}}.

        – Mico
        Dec 18 '18 at 14:14






      • 3





        @Mico It should be tilde{mathbf{Y}}, much likely.

        – egreg
        Dec 18 '18 at 14:16











      • Nice touch to supply the missing inner brackets, by the way.

        – Mico
        Dec 18 '18 at 14:18











      • @egreg it is really looks very nice

        – N. I. ElZayat
        Dec 18 '18 at 14:32








      2




      2





      I'd be tempted to replace all instances of mathbf{tilde{Y}} with widetilde{mathbf{Y}}.

      – Mico
      Dec 18 '18 at 14:14





      I'd be tempted to replace all instances of mathbf{tilde{Y}} with widetilde{mathbf{Y}}.

      – Mico
      Dec 18 '18 at 14:14




      3




      3





      @Mico It should be tilde{mathbf{Y}}, much likely.

      – egreg
      Dec 18 '18 at 14:16





      @Mico It should be tilde{mathbf{Y}}, much likely.

      – egreg
      Dec 18 '18 at 14:16













      Nice touch to supply the missing inner brackets, by the way.

      – Mico
      Dec 18 '18 at 14:18





      Nice touch to supply the missing inner brackets, by the way.

      – Mico
      Dec 18 '18 at 14:18













      @egreg it is really looks very nice

      – N. I. ElZayat
      Dec 18 '18 at 14:32





      @egreg it is really looks very nice

      – N. I. ElZayat
      Dec 18 '18 at 14:32











      3














      Reduce the text size or make it spread into several lines.



      begin{flalign}
      {footnotesize
      begin{aligned}
      frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=
      &sum_{i=1}^{N-N^*} Bigg(bigg[sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}\&
      mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i}bigg]
      -bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
      mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} bigg]Bigg)\
      &-sum_{i=1}^{N^*} sum_{j=2}^{n_i}bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
      end{aligned}}
      end{flalign}





      share|improve this answer



















      • 1





        I just notice your answer, this is exactly what comes to my mind before I saw you answer

        – N. I. ElZayat
        Dec 18 '18 at 14:06






      • 1





        And you remembered to check the log before you posted this? Hint: footnotesize is not allowed in math mode.

        – daleif
        Dec 18 '18 at 14:08






      • 3





        No error is not the same as not being correct. You get LaTeX Font Warning: Command footnotesize invalid in math mode if you look in the log. Never use text font resizing commands in math mode.

        – daleif
        Dec 18 '18 at 14:16








      • 2





        It is still a bad practise that should be avoided in a good document design.

        – daleif
        Dec 18 '18 at 14:47






      • 2





        Shrinking the font to make something fit is a bad idea regardless.

        – JPi
        Dec 18 '18 at 17:04
















      3














      Reduce the text size or make it spread into several lines.



      begin{flalign}
      {footnotesize
      begin{aligned}
      frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=
      &sum_{i=1}^{N-N^*} Bigg(bigg[sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}\&
      mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i}bigg]
      -bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
      mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} bigg]Bigg)\
      &-sum_{i=1}^{N^*} sum_{j=2}^{n_i}bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
      end{aligned}}
      end{flalign}





      share|improve this answer



















      • 1





        I just notice your answer, this is exactly what comes to my mind before I saw you answer

        – N. I. ElZayat
        Dec 18 '18 at 14:06






      • 1





        And you remembered to check the log before you posted this? Hint: footnotesize is not allowed in math mode.

        – daleif
        Dec 18 '18 at 14:08






      • 3





        No error is not the same as not being correct. You get LaTeX Font Warning: Command footnotesize invalid in math mode if you look in the log. Never use text font resizing commands in math mode.

        – daleif
        Dec 18 '18 at 14:16








      • 2





        It is still a bad practise that should be avoided in a good document design.

        – daleif
        Dec 18 '18 at 14:47






      • 2





        Shrinking the font to make something fit is a bad idea regardless.

        – JPi
        Dec 18 '18 at 17:04














      3












      3








      3







      Reduce the text size or make it spread into several lines.



      begin{flalign}
      {footnotesize
      begin{aligned}
      frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=
      &sum_{i=1}^{N-N^*} Bigg(bigg[sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}\&
      mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i}bigg]
      -bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
      mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} bigg]Bigg)\
      &-sum_{i=1}^{N^*} sum_{j=2}^{n_i}bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
      end{aligned}}
      end{flalign}





      share|improve this answer













      Reduce the text size or make it spread into several lines.



      begin{flalign}
      {footnotesize
      begin{aligned}
      frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=
      &sum_{i=1}^{N-N^*} Bigg(bigg[sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}\&
      mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i}bigg]
      -bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
      mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} bigg]Bigg)\
      &-sum_{i=1}^{N^*} sum_{j=2}^{n_i}bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
      mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
      end{aligned}}
      end{flalign}






      share|improve this answer












      share|improve this answer



      share|improve this answer










      answered Dec 18 '18 at 14:04









      Litun JohnLitun John

      1,24841320




      1,24841320








      • 1





        I just notice your answer, this is exactly what comes to my mind before I saw you answer

        – N. I. ElZayat
        Dec 18 '18 at 14:06






      • 1





        And you remembered to check the log before you posted this? Hint: footnotesize is not allowed in math mode.

        – daleif
        Dec 18 '18 at 14:08






      • 3





        No error is not the same as not being correct. You get LaTeX Font Warning: Command footnotesize invalid in math mode if you look in the log. Never use text font resizing commands in math mode.

        – daleif
        Dec 18 '18 at 14:16








      • 2





        It is still a bad practise that should be avoided in a good document design.

        – daleif
        Dec 18 '18 at 14:47






      • 2





        Shrinking the font to make something fit is a bad idea regardless.

        – JPi
        Dec 18 '18 at 17:04














      • 1





        I just notice your answer, this is exactly what comes to my mind before I saw you answer

        – N. I. ElZayat
        Dec 18 '18 at 14:06






      • 1





        And you remembered to check the log before you posted this? Hint: footnotesize is not allowed in math mode.

        – daleif
        Dec 18 '18 at 14:08






      • 3





        No error is not the same as not being correct. You get LaTeX Font Warning: Command footnotesize invalid in math mode if you look in the log. Never use text font resizing commands in math mode.

        – daleif
        Dec 18 '18 at 14:16








      • 2





        It is still a bad practise that should be avoided in a good document design.

        – daleif
        Dec 18 '18 at 14:47






      • 2





        Shrinking the font to make something fit is a bad idea regardless.

        – JPi
        Dec 18 '18 at 17:04








      1




      1





      I just notice your answer, this is exactly what comes to my mind before I saw you answer

      – N. I. ElZayat
      Dec 18 '18 at 14:06





      I just notice your answer, this is exactly what comes to my mind before I saw you answer

      – N. I. ElZayat
      Dec 18 '18 at 14:06




      1




      1





      And you remembered to check the log before you posted this? Hint: footnotesize is not allowed in math mode.

      – daleif
      Dec 18 '18 at 14:08





      And you remembered to check the log before you posted this? Hint: footnotesize is not allowed in math mode.

      – daleif
      Dec 18 '18 at 14:08




      3




      3





      No error is not the same as not being correct. You get LaTeX Font Warning: Command footnotesize invalid in math mode if you look in the log. Never use text font resizing commands in math mode.

      – daleif
      Dec 18 '18 at 14:16







      No error is not the same as not being correct. You get LaTeX Font Warning: Command footnotesize invalid in math mode if you look in the log. Never use text font resizing commands in math mode.

      – daleif
      Dec 18 '18 at 14:16






      2




      2





      It is still a bad practise that should be avoided in a good document design.

      – daleif
      Dec 18 '18 at 14:47





      It is still a bad practise that should be avoided in a good document design.

      – daleif
      Dec 18 '18 at 14:47




      2




      2





      Shrinking the font to make something fit is a bad idea regardless.

      – JPi
      Dec 18 '18 at 17:04





      Shrinking the font to make something fit is a bad idea regardless.

      – JPi
      Dec 18 '18 at 17:04











      3














      enter image description here



      I've made the code a bit more legible and changed Bigg( to Biggl( etc. Also, I'm using the multline environment from amsmath which is suitable here.



      documentclass{article}

      usepackage{amsmath}
      usepackage{bm}
      usepackage[margin=1in]{geometry}

      newcommand{bP}{bm{P}}
      newcommand{tY}{mathbf{tilde Y}}
      begin{document}
      begin{multline}
      frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=
      sum_{i=1}^{N-N^*} Biggl(biggl[sum_{j=2}^{d_i-1} -;frac{bP_{ij}'bP_{ij} (1-bP_{ij})'}{(1-bP_{ij})'(1-bP_{ij})+bP_{ij}'bP_{ij}}tY_j tY'_j + frac{bP_{id_i}'(1-bP_{id_i})'(1-bP_{id_i})}{(1-bP_{id_i})'(1-bP_{id_i})+bP_{id_i}'bP_{id_i}}
      tY_{d_i} tY'_{d_i}biggr]\
      -biggl[sum_{j=2}^{d_i-1} frac{bP_{ij}}{(1-bP_{ij})'}
      tY_j bP_{ij}(1-bP_{ij}) tY'_j+frac{(1-bP_{id_i})}{bP'_{id_i}}
      tY_{d_i} bP_{id_i}(1-bP_{id_i}) tY'_{d_i} biggr]Biggr)\
      -sum_{i=1}^{N^*} sum_{j=2}^{n_i}biggl[frac{bP_{ij}'bP_{ij} (1-bP_{ij})'}{(1-bP_{ij})'(1-bP_{ij})+bP_{ij}'bP_{ij}}tY_j tY'_j + frac{bP_{ij}}{(1-bP_{ij})'}
      tY_j bP_{ij}(1-bP_{ij}) tY'_jbiggr]
      end{multline}

      end{document}





      share|improve this answer




























        3














        enter image description here



        I've made the code a bit more legible and changed Bigg( to Biggl( etc. Also, I'm using the multline environment from amsmath which is suitable here.



        documentclass{article}

        usepackage{amsmath}
        usepackage{bm}
        usepackage[margin=1in]{geometry}

        newcommand{bP}{bm{P}}
        newcommand{tY}{mathbf{tilde Y}}
        begin{document}
        begin{multline}
        frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=
        sum_{i=1}^{N-N^*} Biggl(biggl[sum_{j=2}^{d_i-1} -;frac{bP_{ij}'bP_{ij} (1-bP_{ij})'}{(1-bP_{ij})'(1-bP_{ij})+bP_{ij}'bP_{ij}}tY_j tY'_j + frac{bP_{id_i}'(1-bP_{id_i})'(1-bP_{id_i})}{(1-bP_{id_i})'(1-bP_{id_i})+bP_{id_i}'bP_{id_i}}
        tY_{d_i} tY'_{d_i}biggr]\
        -biggl[sum_{j=2}^{d_i-1} frac{bP_{ij}}{(1-bP_{ij})'}
        tY_j bP_{ij}(1-bP_{ij}) tY'_j+frac{(1-bP_{id_i})}{bP'_{id_i}}
        tY_{d_i} bP_{id_i}(1-bP_{id_i}) tY'_{d_i} biggr]Biggr)\
        -sum_{i=1}^{N^*} sum_{j=2}^{n_i}biggl[frac{bP_{ij}'bP_{ij} (1-bP_{ij})'}{(1-bP_{ij})'(1-bP_{ij})+bP_{ij}'bP_{ij}}tY_j tY'_j + frac{bP_{ij}}{(1-bP_{ij})'}
        tY_j bP_{ij}(1-bP_{ij}) tY'_jbiggr]
        end{multline}

        end{document}





        share|improve this answer


























          3












          3








          3







          enter image description here



          I've made the code a bit more legible and changed Bigg( to Biggl( etc. Also, I'm using the multline environment from amsmath which is suitable here.



          documentclass{article}

          usepackage{amsmath}
          usepackage{bm}
          usepackage[margin=1in]{geometry}

          newcommand{bP}{bm{P}}
          newcommand{tY}{mathbf{tilde Y}}
          begin{document}
          begin{multline}
          frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=
          sum_{i=1}^{N-N^*} Biggl(biggl[sum_{j=2}^{d_i-1} -;frac{bP_{ij}'bP_{ij} (1-bP_{ij})'}{(1-bP_{ij})'(1-bP_{ij})+bP_{ij}'bP_{ij}}tY_j tY'_j + frac{bP_{id_i}'(1-bP_{id_i})'(1-bP_{id_i})}{(1-bP_{id_i})'(1-bP_{id_i})+bP_{id_i}'bP_{id_i}}
          tY_{d_i} tY'_{d_i}biggr]\
          -biggl[sum_{j=2}^{d_i-1} frac{bP_{ij}}{(1-bP_{ij})'}
          tY_j bP_{ij}(1-bP_{ij}) tY'_j+frac{(1-bP_{id_i})}{bP'_{id_i}}
          tY_{d_i} bP_{id_i}(1-bP_{id_i}) tY'_{d_i} biggr]Biggr)\
          -sum_{i=1}^{N^*} sum_{j=2}^{n_i}biggl[frac{bP_{ij}'bP_{ij} (1-bP_{ij})'}{(1-bP_{ij})'(1-bP_{ij})+bP_{ij}'bP_{ij}}tY_j tY'_j + frac{bP_{ij}}{(1-bP_{ij})'}
          tY_j bP_{ij}(1-bP_{ij}) tY'_jbiggr]
          end{multline}

          end{document}





          share|improve this answer













          enter image description here



          I've made the code a bit more legible and changed Bigg( to Biggl( etc. Also, I'm using the multline environment from amsmath which is suitable here.



          documentclass{article}

          usepackage{amsmath}
          usepackage{bm}
          usepackage[margin=1in]{geometry}

          newcommand{bP}{bm{P}}
          newcommand{tY}{mathbf{tilde Y}}
          begin{document}
          begin{multline}
          frac{partial^2 ell}{partial bm{phi}partialbm{phi}'}=
          sum_{i=1}^{N-N^*} Biggl(biggl[sum_{j=2}^{d_i-1} -;frac{bP_{ij}'bP_{ij} (1-bP_{ij})'}{(1-bP_{ij})'(1-bP_{ij})+bP_{ij}'bP_{ij}}tY_j tY'_j + frac{bP_{id_i}'(1-bP_{id_i})'(1-bP_{id_i})}{(1-bP_{id_i})'(1-bP_{id_i})+bP_{id_i}'bP_{id_i}}
          tY_{d_i} tY'_{d_i}biggr]\
          -biggl[sum_{j=2}^{d_i-1} frac{bP_{ij}}{(1-bP_{ij})'}
          tY_j bP_{ij}(1-bP_{ij}) tY'_j+frac{(1-bP_{id_i})}{bP'_{id_i}}
          tY_{d_i} bP_{id_i}(1-bP_{id_i}) tY'_{d_i} biggr]Biggr)\
          -sum_{i=1}^{N^*} sum_{j=2}^{n_i}biggl[frac{bP_{ij}'bP_{ij} (1-bP_{ij})'}{(1-bP_{ij})'(1-bP_{ij})+bP_{ij}'bP_{ij}}tY_j tY'_j + frac{bP_{ij}}{(1-bP_{ij})'}
          tY_j bP_{ij}(1-bP_{ij}) tY'_jbiggr]
          end{multline}

          end{document}






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Dec 18 '18 at 14:18









          JPiJPi

          9,64421550




          9,64421550























              2














              I propose this, with package geometry. If you have the default layout with large margins, you can nest the equation contents in a medsize environment from nccmath (~ 80% of previous size):



              documentclass{article}
              usepackage{geometry}
              usepackage{showframe}
              renewcommand{ShowFrameLinethickness}{0.3pt}
              usepackage{amsmath, bm, nccmath}
              usepackage{diffcoeff}

              begin{document}

              begin{equation}
              begin{aligned}diffp[1,1]{ell}{bm{phi},bm{phi}'} =
              sum_{i=1}^{N-N^*} Bigg( & bigg[begin{aligned}[t]sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'
              bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
              mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i} & bigg]\
              %&
              - bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
              mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
              mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} &bigg]Bigg)
              end{aligned}\
              % &
              -sum_{i=1}^{N^*} sum_{j=2}^{n_i} & bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
              mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
              end{aligned}
              end{equation}
              bigskip

              begin{equation}
              begin{medsize}
              begin{aligned}diffp[1,1]{ell}{bm{phi},bm{phi}'} =
              sum_{i=1}^{N-N^*} Biggl( & Biggl[begin{aligned}[t]sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'
              bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
              mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i} & Biggr]\
              %&
              - Biggl[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
              mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
              mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} &Biggr]Biggr)
              end{aligned}\
              % &
              -sum_{i=1}^{N^*} sum_{j=2}^{n_i} & biggl[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
              mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbiggr]
              end{aligned}
              end{medsize}
              end{equation}

              end{document}





              share|improve this answer




























                2














                I propose this, with package geometry. If you have the default layout with large margins, you can nest the equation contents in a medsize environment from nccmath (~ 80% of previous size):



                documentclass{article}
                usepackage{geometry}
                usepackage{showframe}
                renewcommand{ShowFrameLinethickness}{0.3pt}
                usepackage{amsmath, bm, nccmath}
                usepackage{diffcoeff}

                begin{document}

                begin{equation}
                begin{aligned}diffp[1,1]{ell}{bm{phi},bm{phi}'} =
                sum_{i=1}^{N-N^*} Bigg( & bigg[begin{aligned}[t]sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'
                bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
                mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i} & bigg]\
                %&
                - bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
                mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
                mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} &bigg]Bigg)
                end{aligned}\
                % &
                -sum_{i=1}^{N^*} sum_{j=2}^{n_i} & bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
                mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
                end{aligned}
                end{equation}
                bigskip

                begin{equation}
                begin{medsize}
                begin{aligned}diffp[1,1]{ell}{bm{phi},bm{phi}'} =
                sum_{i=1}^{N-N^*} Biggl( & Biggl[begin{aligned}[t]sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'
                bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
                mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i} & Biggr]\
                %&
                - Biggl[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
                mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
                mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} &Biggr]Biggr)
                end{aligned}\
                % &
                -sum_{i=1}^{N^*} sum_{j=2}^{n_i} & biggl[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
                mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbiggr]
                end{aligned}
                end{medsize}
                end{equation}

                end{document}





                share|improve this answer


























                  2












                  2








                  2







                  I propose this, with package geometry. If you have the default layout with large margins, you can nest the equation contents in a medsize environment from nccmath (~ 80% of previous size):



                  documentclass{article}
                  usepackage{geometry}
                  usepackage{showframe}
                  renewcommand{ShowFrameLinethickness}{0.3pt}
                  usepackage{amsmath, bm, nccmath}
                  usepackage{diffcoeff}

                  begin{document}

                  begin{equation}
                  begin{aligned}diffp[1,1]{ell}{bm{phi},bm{phi}'} =
                  sum_{i=1}^{N-N^*} Bigg( & bigg[begin{aligned}[t]sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'
                  bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
                  mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i} & bigg]\
                  %&
                  - bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
                  mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
                  mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} &bigg]Bigg)
                  end{aligned}\
                  % &
                  -sum_{i=1}^{N^*} sum_{j=2}^{n_i} & bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
                  mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
                  end{aligned}
                  end{equation}
                  bigskip

                  begin{equation}
                  begin{medsize}
                  begin{aligned}diffp[1,1]{ell}{bm{phi},bm{phi}'} =
                  sum_{i=1}^{N-N^*} Biggl( & Biggl[begin{aligned}[t]sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'
                  bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
                  mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i} & Biggr]\
                  %&
                  - Biggl[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
                  mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
                  mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} &Biggr]Biggr)
                  end{aligned}\
                  % &
                  -sum_{i=1}^{N^*} sum_{j=2}^{n_i} & biggl[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
                  mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbiggr]
                  end{aligned}
                  end{medsize}
                  end{equation}

                  end{document}





                  share|improve this answer













                  I propose this, with package geometry. If you have the default layout with large margins, you can nest the equation contents in a medsize environment from nccmath (~ 80% of previous size):



                  documentclass{article}
                  usepackage{geometry}
                  usepackage{showframe}
                  renewcommand{ShowFrameLinethickness}{0.3pt}
                  usepackage{amsmath, bm, nccmath}
                  usepackage{diffcoeff}

                  begin{document}

                  begin{equation}
                  begin{aligned}diffp[1,1]{ell}{bm{phi},bm{phi}'} =
                  sum_{i=1}^{N-N^*} Bigg( & bigg[begin{aligned}[t]sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'
                  bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
                  mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i} & bigg]\
                  %&
                  - bigg[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
                  mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
                  mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} &bigg]Bigg)
                  end{aligned}\
                  % &
                  -sum_{i=1}^{N^*} sum_{j=2}^{n_i} & bigg[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
                  mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbigg]
                  end{aligned}
                  end{equation}
                  bigskip

                  begin{equation}
                  begin{medsize}
                  begin{aligned}diffp[1,1]{ell}{bm{phi},bm{phi}'} =
                  sum_{i=1}^{N-N^*} Biggl( & Biggl[begin{aligned}[t]sum_{j=2}^{d_i-1} -;tfrac{bm{P}_{ij}'
                  bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{id_i}'(1-bm{P}_{id_i})'(1-bm{P}_{id_i})}{(1-bm{P}_{id_i})'(1-bm{P}_{id_i})+bm{P}_{id_i}'bm{P}_{id_i}}
                  mathbf{tilde{Y}}_{d_i} mathbf{tilde{Y}}'_{d_i} & Biggr]\
                  %&
                  - Biggl[sum_{j=2}^{d_i-1} tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
                  mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_j+tfrac{(1-bm{P}_{id_i})}{bm{P}'_{id_i}}
                  mathbf{tilde{Y}}_{d_i} bm{P}_{id_i}(1-bm{P}_{id_i}) mathbf{tilde{Y}}'_{d_i} &Biggr]Biggr)
                  end{aligned}\
                  % &
                  -sum_{i=1}^{N^*} sum_{j=2}^{n_i} & biggl[tfrac{bm{P}_{ij}'bm{P}_{ij} (1-bm{P}_{ij})'}{(1-bm{P}_{ij})'(1-bm{P}_{ij})+bm{P}_{ij}'bm{P}_{ij}}mathbf{tilde{Y}}_j mathbf{tilde{Y}}'_j + tfrac{bm{P}_{ij}}{(1-bm{P}_{ij})'}
                  mathbf{tilde{Y}}_j bm{P}_{ij}(1-bm{P}_{ij}) mathbf{tilde{Y}}'_jbiggr]
                  end{aligned}
                  end{medsize}
                  end{equation}

                  end{document}






                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Dec 18 '18 at 15:14









                  BernardBernard

                  170k775202




                  170k775202






























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