What are “complementary pair-wise comparable functions”?












1












$begingroup$


I got this term while studying periodic functions; my book writes:




If $f_1(x)$ & $f_2(x)$ are periodic functions with periods $T_1$ & $T_2$ respectively, then we have $h(x) = f_1(x) + f_2(x)$ has period, as $dfrac{1}{2} text{L.C.M. of }; {T_1 ,T_2}$, if $f_1(x)$ & $f_2(x)$ are complementary pair-wise comparable functions.




Don't know how the author deduced the rule. But my main question is what do this "complementary, pair-wise, comparable function" mean? I've googled this but it was in vain.










share|cite|improve this question









$endgroup$

















    1












    $begingroup$


    I got this term while studying periodic functions; my book writes:




    If $f_1(x)$ & $f_2(x)$ are periodic functions with periods $T_1$ & $T_2$ respectively, then we have $h(x) = f_1(x) + f_2(x)$ has period, as $dfrac{1}{2} text{L.C.M. of }; {T_1 ,T_2}$, if $f_1(x)$ & $f_2(x)$ are complementary pair-wise comparable functions.




    Don't know how the author deduced the rule. But my main question is what do this "complementary, pair-wise, comparable function" mean? I've googled this but it was in vain.










    share|cite|improve this question









    $endgroup$















      1












      1








      1





      $begingroup$


      I got this term while studying periodic functions; my book writes:




      If $f_1(x)$ & $f_2(x)$ are periodic functions with periods $T_1$ & $T_2$ respectively, then we have $h(x) = f_1(x) + f_2(x)$ has period, as $dfrac{1}{2} text{L.C.M. of }; {T_1 ,T_2}$, if $f_1(x)$ & $f_2(x)$ are complementary pair-wise comparable functions.




      Don't know how the author deduced the rule. But my main question is what do this "complementary, pair-wise, comparable function" mean? I've googled this but it was in vain.










      share|cite|improve this question









      $endgroup$




      I got this term while studying periodic functions; my book writes:




      If $f_1(x)$ & $f_2(x)$ are periodic functions with periods $T_1$ & $T_2$ respectively, then we have $h(x) = f_1(x) + f_2(x)$ has period, as $dfrac{1}{2} text{L.C.M. of }; {T_1 ,T_2}$, if $f_1(x)$ & $f_2(x)$ are complementary pair-wise comparable functions.




      Don't know how the author deduced the rule. But my main question is what do this "complementary, pair-wise, comparable function" mean? I've googled this but it was in vain.







      functions






      share|cite|improve this question













      share|cite|improve this question











      share|cite|improve this question




      share|cite|improve this question










      asked Sep 6 '15 at 18:07







      user142971





























          2 Answers
          2






          active

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          0












          $begingroup$

          I think it means if you put $(π/2-x)$ in place of $x$ in one of the functions and get the second function, then they are called complementary. Like $sin(x)$ and $cos(x)$.






          share|cite|improve this answer











          $endgroup$





















            -2












            $begingroup$

            Consider a set of functions $F$.



            The set is pairwise comparable if, for any two functions $f(x)$ and $g(x)$ within the set $F$, we know that either:



            $f(x) ge g(x)$ for any value of $x$, or
            $f(x) le g(x)$ for any value of $x$.






            share|cite|improve this answer











            $endgroup$













            • $begingroup$
              and what does it mean when you put "complementary" in there?
              $endgroup$
              – GEdgar
              Mar 26 '16 at 18:55










            • $begingroup$
              This interpretation doesn't seem to make much sense in the context of the question.
              $endgroup$
              – Eric Wofsey
              Mar 26 '16 at 19:27











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            2 Answers
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            0












            $begingroup$

            I think it means if you put $(π/2-x)$ in place of $x$ in one of the functions and get the second function, then they are called complementary. Like $sin(x)$ and $cos(x)$.






            share|cite|improve this answer











            $endgroup$


















              0












              $begingroup$

              I think it means if you put $(π/2-x)$ in place of $x$ in one of the functions and get the second function, then they are called complementary. Like $sin(x)$ and $cos(x)$.






              share|cite|improve this answer











              $endgroup$
















                0












                0








                0





                $begingroup$

                I think it means if you put $(π/2-x)$ in place of $x$ in one of the functions and get the second function, then they are called complementary. Like $sin(x)$ and $cos(x)$.






                share|cite|improve this answer











                $endgroup$



                I think it means if you put $(π/2-x)$ in place of $x$ in one of the functions and get the second function, then they are called complementary. Like $sin(x)$ and $cos(x)$.







                share|cite|improve this answer














                share|cite|improve this answer



                share|cite|improve this answer








                edited Apr 15 '18 at 12:53









                Tyrone

                4,72011225




                4,72011225










                answered Apr 15 '18 at 12:35









                SwastikSwastik

                1




                1























                    -2












                    $begingroup$

                    Consider a set of functions $F$.



                    The set is pairwise comparable if, for any two functions $f(x)$ and $g(x)$ within the set $F$, we know that either:



                    $f(x) ge g(x)$ for any value of $x$, or
                    $f(x) le g(x)$ for any value of $x$.






                    share|cite|improve this answer











                    $endgroup$













                    • $begingroup$
                      and what does it mean when you put "complementary" in there?
                      $endgroup$
                      – GEdgar
                      Mar 26 '16 at 18:55










                    • $begingroup$
                      This interpretation doesn't seem to make much sense in the context of the question.
                      $endgroup$
                      – Eric Wofsey
                      Mar 26 '16 at 19:27
















                    -2












                    $begingroup$

                    Consider a set of functions $F$.



                    The set is pairwise comparable if, for any two functions $f(x)$ and $g(x)$ within the set $F$, we know that either:



                    $f(x) ge g(x)$ for any value of $x$, or
                    $f(x) le g(x)$ for any value of $x$.






                    share|cite|improve this answer











                    $endgroup$













                    • $begingroup$
                      and what does it mean when you put "complementary" in there?
                      $endgroup$
                      – GEdgar
                      Mar 26 '16 at 18:55










                    • $begingroup$
                      This interpretation doesn't seem to make much sense in the context of the question.
                      $endgroup$
                      – Eric Wofsey
                      Mar 26 '16 at 19:27














                    -2












                    -2








                    -2





                    $begingroup$

                    Consider a set of functions $F$.



                    The set is pairwise comparable if, for any two functions $f(x)$ and $g(x)$ within the set $F$, we know that either:



                    $f(x) ge g(x)$ for any value of $x$, or
                    $f(x) le g(x)$ for any value of $x$.






                    share|cite|improve this answer











                    $endgroup$



                    Consider a set of functions $F$.



                    The set is pairwise comparable if, for any two functions $f(x)$ and $g(x)$ within the set $F$, we know that either:



                    $f(x) ge g(x)$ for any value of $x$, or
                    $f(x) le g(x)$ for any value of $x$.







                    share|cite|improve this answer














                    share|cite|improve this answer



                    share|cite|improve this answer








                    edited Mar 26 '16 at 18:56







                    user249332

















                    answered Mar 26 '16 at 18:52









                    NavneetNavneet

                    1




                    1












                    • $begingroup$
                      and what does it mean when you put "complementary" in there?
                      $endgroup$
                      – GEdgar
                      Mar 26 '16 at 18:55










                    • $begingroup$
                      This interpretation doesn't seem to make much sense in the context of the question.
                      $endgroup$
                      – Eric Wofsey
                      Mar 26 '16 at 19:27


















                    • $begingroup$
                      and what does it mean when you put "complementary" in there?
                      $endgroup$
                      – GEdgar
                      Mar 26 '16 at 18:55










                    • $begingroup$
                      This interpretation doesn't seem to make much sense in the context of the question.
                      $endgroup$
                      – Eric Wofsey
                      Mar 26 '16 at 19:27
















                    $begingroup$
                    and what does it mean when you put "complementary" in there?
                    $endgroup$
                    – GEdgar
                    Mar 26 '16 at 18:55




                    $begingroup$
                    and what does it mean when you put "complementary" in there?
                    $endgroup$
                    – GEdgar
                    Mar 26 '16 at 18:55












                    $begingroup$
                    This interpretation doesn't seem to make much sense in the context of the question.
                    $endgroup$
                    – Eric Wofsey
                    Mar 26 '16 at 19:27




                    $begingroup$
                    This interpretation doesn't seem to make much sense in the context of the question.
                    $endgroup$
                    – Eric Wofsey
                    Mar 26 '16 at 19:27


















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