Closed form for $sumlimits_{n=1}^{infty}frac{O_{n}^{(p)}}{(2n-1)^{q}}$, with...
$begingroup$
Consider the sum
$$sum_{n=1}^{infty}frac{O_{n}^{(p)}}{(2n-1)^{q}}text{, with }O_{n}^{(s)}=1+frac{1}{3^{s}}+dots+frac{1}{(2n-1)^{s}}$$
My question is: if there exists some general theorems that allow to represent this sums in terms of the Riemann Zeta function, like Borwein-Borwein-Girgensohn theorem for Euler sums?
sequences-and-series closed-form riemann-zeta euler-sums
$endgroup$
add a comment |
$begingroup$
Consider the sum
$$sum_{n=1}^{infty}frac{O_{n}^{(p)}}{(2n-1)^{q}}text{, with }O_{n}^{(s)}=1+frac{1}{3^{s}}+dots+frac{1}{(2n-1)^{s}}$$
My question is: if there exists some general theorems that allow to represent this sums in terms of the Riemann Zeta function, like Borwein-Borwein-Girgensohn theorem for Euler sums?
sequences-and-series closed-form riemann-zeta euler-sums
$endgroup$
$begingroup$
These Euler sums are well-known to be solvable (in terms of $zeta$) for $p+qleq 5$ and in other cases (like $p=q$), see The Bible.
$endgroup$
– Jack D'Aurizio
Jan 3 at 20:17
$begingroup$
I'm not sure, which theorem exactly do you have in mind?
$endgroup$
– Isak
Jan 4 at 22:35
$begingroup$
I'm most interested in the case $p=2n,$ $q=2n+1$.
$endgroup$
– Isak
Jan 11 at 22:00
add a comment |
$begingroup$
Consider the sum
$$sum_{n=1}^{infty}frac{O_{n}^{(p)}}{(2n-1)^{q}}text{, with }O_{n}^{(s)}=1+frac{1}{3^{s}}+dots+frac{1}{(2n-1)^{s}}$$
My question is: if there exists some general theorems that allow to represent this sums in terms of the Riemann Zeta function, like Borwein-Borwein-Girgensohn theorem for Euler sums?
sequences-and-series closed-form riemann-zeta euler-sums
$endgroup$
Consider the sum
$$sum_{n=1}^{infty}frac{O_{n}^{(p)}}{(2n-1)^{q}}text{, with }O_{n}^{(s)}=1+frac{1}{3^{s}}+dots+frac{1}{(2n-1)^{s}}$$
My question is: if there exists some general theorems that allow to represent this sums in terms of the Riemann Zeta function, like Borwein-Borwein-Girgensohn theorem for Euler sums?
sequences-and-series closed-form riemann-zeta euler-sums
sequences-and-series closed-form riemann-zeta euler-sums
edited Jan 3 at 19:50
mrtaurho
6,09271641
6,09271641
asked Jan 3 at 19:46
IsakIsak
255
255
$begingroup$
These Euler sums are well-known to be solvable (in terms of $zeta$) for $p+qleq 5$ and in other cases (like $p=q$), see The Bible.
$endgroup$
– Jack D'Aurizio
Jan 3 at 20:17
$begingroup$
I'm not sure, which theorem exactly do you have in mind?
$endgroup$
– Isak
Jan 4 at 22:35
$begingroup$
I'm most interested in the case $p=2n,$ $q=2n+1$.
$endgroup$
– Isak
Jan 11 at 22:00
add a comment |
$begingroup$
These Euler sums are well-known to be solvable (in terms of $zeta$) for $p+qleq 5$ and in other cases (like $p=q$), see The Bible.
$endgroup$
– Jack D'Aurizio
Jan 3 at 20:17
$begingroup$
I'm not sure, which theorem exactly do you have in mind?
$endgroup$
– Isak
Jan 4 at 22:35
$begingroup$
I'm most interested in the case $p=2n,$ $q=2n+1$.
$endgroup$
– Isak
Jan 11 at 22:00
$begingroup$
These Euler sums are well-known to be solvable (in terms of $zeta$) for $p+qleq 5$ and in other cases (like $p=q$), see The Bible.
$endgroup$
– Jack D'Aurizio
Jan 3 at 20:17
$begingroup$
These Euler sums are well-known to be solvable (in terms of $zeta$) for $p+qleq 5$ and in other cases (like $p=q$), see The Bible.
$endgroup$
– Jack D'Aurizio
Jan 3 at 20:17
$begingroup$
I'm not sure, which theorem exactly do you have in mind?
$endgroup$
– Isak
Jan 4 at 22:35
$begingroup$
I'm not sure, which theorem exactly do you have in mind?
$endgroup$
– Isak
Jan 4 at 22:35
$begingroup$
I'm most interested in the case $p=2n,$ $q=2n+1$.
$endgroup$
– Isak
Jan 11 at 22:00
$begingroup$
I'm most interested in the case $p=2n,$ $q=2n+1$.
$endgroup$
– Isak
Jan 11 at 22:00
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
Changing your notation a bit
and playing around.
If
$O_{n}(s)
=1+frac{1}{3^{s}}+dots+frac{1}{(2n-1)^{s}}
=sum_{k=1}^n frac1{(2k-1)^s}
$,
$O(s)
=O_{infty}(s)
$,
and
$s(p, q)
=sum_{n=1}^{infty}dfrac{O_{n}(p)}{(2n-1)^{q}}
$
then
$s(p, q)+s(q, p)
=O(p)O(q)+O(p+q)
$.
Proof.
$begin{array}\
s(p, q)
&=sum_{n=1}^{infty}dfrac{O_{n}(p)}{(2n-1)^{q}}\
&=sum_{n=1}^{infty}dfrac{sum_{k=1}^n frac1{(2k-1)^p}}{(2n-1)^{q}}\
&=sum_{n=1}^{infty}sum_{k=1}^n dfrac1{(2k-1)^p}dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}sum_{n=k}^{infty} dfrac1{(2k-1)^p}dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}sum_{n=k}^{infty} dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}left(sum_{n=1}^{infty} dfrac{1}{(2n-1)^{q}}-sum_{n=1}^{k-1} dfrac{1}{(2n-1)^{q}}right)\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}left(O(q)-O_{k-1}(q)right)\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}O_{k-1}(q)\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}(O_{k}(q)-frac1{(2k-1)^q})\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}O_{k}(q)+sum_{k=1}^{infty}dfrac1{(2k-1)^p}dfrac1{(2k-1)^q}\
&=O(p)O(q)-s(q, p)+sum_{k=1}^{infty}dfrac1{(2k-1)^{p+q}}\
&=O(p)O(q)-s(q, p)+O(p+q)
\
end{array}
$
Some additional
definitions and stuff
which might be useful.
$Z_{n}(s)
=sum_{k=1}^n frac1{k^s}
$
$E_{n}(s)
=sum_{k=1}^n frac1{(2k)^s}
=frac1{2^s}sum_{k=1}^n frac1{k^s}
=frac1{2^s}Z_{n}(s)
$
$O_{n}(s)+E_{n}(s)
=sum_{k=1}^{2n} frac1{k^s}
=Z_{2n}(s)
$
so
$O_{n}(s)
=Z_{2n}(s)-E_{n}(s)
=Z_{2n}(s)-frac1{2^s}Z_{n}(s)
$
$O(s)
=O_{infty}(s)
$,
$E(s)
=E_{infty}(s)
$,
$Z(s)
=zeta(s)
=Z_{infty}(s)
$.
$O(s)
=Z(s)-E(s)
=Z(s)-frac1{2^s}Z(s)
=(1-2^{-s})Z(s)
$
$endgroup$
$begingroup$
What about $p+q$ being odd?
$endgroup$
– Isak
Jan 8 at 22:37
$begingroup$
I don't see where my answer depends on the parity of p or q.
$endgroup$
– marty cohen
Jan 9 at 22:44
$begingroup$
I was thinking about the general case $sum_{n=1}^{infty}frac{O_{n}^{(p)}}{(2n-1)^{q}}$
$endgroup$
– Isak
Jan 9 at 23:13
$begingroup$
Don't know about that. I was doing my usual playing around and found, to my surprise, the expression with p and q exchanged. So if you know s(p, q), you can get s(q, p).
$endgroup$
– marty cohen
Jan 9 at 23:52
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
return StackExchange.using("mathjaxEditing", function () {
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
});
});
}, "mathjax-editing");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "69"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3060925%2fclosed-form-for-sum-limits-n-1-infty-fraco-np2n-1q-with%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Changing your notation a bit
and playing around.
If
$O_{n}(s)
=1+frac{1}{3^{s}}+dots+frac{1}{(2n-1)^{s}}
=sum_{k=1}^n frac1{(2k-1)^s}
$,
$O(s)
=O_{infty}(s)
$,
and
$s(p, q)
=sum_{n=1}^{infty}dfrac{O_{n}(p)}{(2n-1)^{q}}
$
then
$s(p, q)+s(q, p)
=O(p)O(q)+O(p+q)
$.
Proof.
$begin{array}\
s(p, q)
&=sum_{n=1}^{infty}dfrac{O_{n}(p)}{(2n-1)^{q}}\
&=sum_{n=1}^{infty}dfrac{sum_{k=1}^n frac1{(2k-1)^p}}{(2n-1)^{q}}\
&=sum_{n=1}^{infty}sum_{k=1}^n dfrac1{(2k-1)^p}dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}sum_{n=k}^{infty} dfrac1{(2k-1)^p}dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}sum_{n=k}^{infty} dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}left(sum_{n=1}^{infty} dfrac{1}{(2n-1)^{q}}-sum_{n=1}^{k-1} dfrac{1}{(2n-1)^{q}}right)\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}left(O(q)-O_{k-1}(q)right)\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}O_{k-1}(q)\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}(O_{k}(q)-frac1{(2k-1)^q})\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}O_{k}(q)+sum_{k=1}^{infty}dfrac1{(2k-1)^p}dfrac1{(2k-1)^q}\
&=O(p)O(q)-s(q, p)+sum_{k=1}^{infty}dfrac1{(2k-1)^{p+q}}\
&=O(p)O(q)-s(q, p)+O(p+q)
\
end{array}
$
Some additional
definitions and stuff
which might be useful.
$Z_{n}(s)
=sum_{k=1}^n frac1{k^s}
$
$E_{n}(s)
=sum_{k=1}^n frac1{(2k)^s}
=frac1{2^s}sum_{k=1}^n frac1{k^s}
=frac1{2^s}Z_{n}(s)
$
$O_{n}(s)+E_{n}(s)
=sum_{k=1}^{2n} frac1{k^s}
=Z_{2n}(s)
$
so
$O_{n}(s)
=Z_{2n}(s)-E_{n}(s)
=Z_{2n}(s)-frac1{2^s}Z_{n}(s)
$
$O(s)
=O_{infty}(s)
$,
$E(s)
=E_{infty}(s)
$,
$Z(s)
=zeta(s)
=Z_{infty}(s)
$.
$O(s)
=Z(s)-E(s)
=Z(s)-frac1{2^s}Z(s)
=(1-2^{-s})Z(s)
$
$endgroup$
$begingroup$
What about $p+q$ being odd?
$endgroup$
– Isak
Jan 8 at 22:37
$begingroup$
I don't see where my answer depends on the parity of p or q.
$endgroup$
– marty cohen
Jan 9 at 22:44
$begingroup$
I was thinking about the general case $sum_{n=1}^{infty}frac{O_{n}^{(p)}}{(2n-1)^{q}}$
$endgroup$
– Isak
Jan 9 at 23:13
$begingroup$
Don't know about that. I was doing my usual playing around and found, to my surprise, the expression with p and q exchanged. So if you know s(p, q), you can get s(q, p).
$endgroup$
– marty cohen
Jan 9 at 23:52
add a comment |
$begingroup$
Changing your notation a bit
and playing around.
If
$O_{n}(s)
=1+frac{1}{3^{s}}+dots+frac{1}{(2n-1)^{s}}
=sum_{k=1}^n frac1{(2k-1)^s}
$,
$O(s)
=O_{infty}(s)
$,
and
$s(p, q)
=sum_{n=1}^{infty}dfrac{O_{n}(p)}{(2n-1)^{q}}
$
then
$s(p, q)+s(q, p)
=O(p)O(q)+O(p+q)
$.
Proof.
$begin{array}\
s(p, q)
&=sum_{n=1}^{infty}dfrac{O_{n}(p)}{(2n-1)^{q}}\
&=sum_{n=1}^{infty}dfrac{sum_{k=1}^n frac1{(2k-1)^p}}{(2n-1)^{q}}\
&=sum_{n=1}^{infty}sum_{k=1}^n dfrac1{(2k-1)^p}dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}sum_{n=k}^{infty} dfrac1{(2k-1)^p}dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}sum_{n=k}^{infty} dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}left(sum_{n=1}^{infty} dfrac{1}{(2n-1)^{q}}-sum_{n=1}^{k-1} dfrac{1}{(2n-1)^{q}}right)\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}left(O(q)-O_{k-1}(q)right)\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}O_{k-1}(q)\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}(O_{k}(q)-frac1{(2k-1)^q})\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}O_{k}(q)+sum_{k=1}^{infty}dfrac1{(2k-1)^p}dfrac1{(2k-1)^q}\
&=O(p)O(q)-s(q, p)+sum_{k=1}^{infty}dfrac1{(2k-1)^{p+q}}\
&=O(p)O(q)-s(q, p)+O(p+q)
\
end{array}
$
Some additional
definitions and stuff
which might be useful.
$Z_{n}(s)
=sum_{k=1}^n frac1{k^s}
$
$E_{n}(s)
=sum_{k=1}^n frac1{(2k)^s}
=frac1{2^s}sum_{k=1}^n frac1{k^s}
=frac1{2^s}Z_{n}(s)
$
$O_{n}(s)+E_{n}(s)
=sum_{k=1}^{2n} frac1{k^s}
=Z_{2n}(s)
$
so
$O_{n}(s)
=Z_{2n}(s)-E_{n}(s)
=Z_{2n}(s)-frac1{2^s}Z_{n}(s)
$
$O(s)
=O_{infty}(s)
$,
$E(s)
=E_{infty}(s)
$,
$Z(s)
=zeta(s)
=Z_{infty}(s)
$.
$O(s)
=Z(s)-E(s)
=Z(s)-frac1{2^s}Z(s)
=(1-2^{-s})Z(s)
$
$endgroup$
$begingroup$
What about $p+q$ being odd?
$endgroup$
– Isak
Jan 8 at 22:37
$begingroup$
I don't see where my answer depends on the parity of p or q.
$endgroup$
– marty cohen
Jan 9 at 22:44
$begingroup$
I was thinking about the general case $sum_{n=1}^{infty}frac{O_{n}^{(p)}}{(2n-1)^{q}}$
$endgroup$
– Isak
Jan 9 at 23:13
$begingroup$
Don't know about that. I was doing my usual playing around and found, to my surprise, the expression with p and q exchanged. So if you know s(p, q), you can get s(q, p).
$endgroup$
– marty cohen
Jan 9 at 23:52
add a comment |
$begingroup$
Changing your notation a bit
and playing around.
If
$O_{n}(s)
=1+frac{1}{3^{s}}+dots+frac{1}{(2n-1)^{s}}
=sum_{k=1}^n frac1{(2k-1)^s}
$,
$O(s)
=O_{infty}(s)
$,
and
$s(p, q)
=sum_{n=1}^{infty}dfrac{O_{n}(p)}{(2n-1)^{q}}
$
then
$s(p, q)+s(q, p)
=O(p)O(q)+O(p+q)
$.
Proof.
$begin{array}\
s(p, q)
&=sum_{n=1}^{infty}dfrac{O_{n}(p)}{(2n-1)^{q}}\
&=sum_{n=1}^{infty}dfrac{sum_{k=1}^n frac1{(2k-1)^p}}{(2n-1)^{q}}\
&=sum_{n=1}^{infty}sum_{k=1}^n dfrac1{(2k-1)^p}dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}sum_{n=k}^{infty} dfrac1{(2k-1)^p}dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}sum_{n=k}^{infty} dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}left(sum_{n=1}^{infty} dfrac{1}{(2n-1)^{q}}-sum_{n=1}^{k-1} dfrac{1}{(2n-1)^{q}}right)\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}left(O(q)-O_{k-1}(q)right)\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}O_{k-1}(q)\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}(O_{k}(q)-frac1{(2k-1)^q})\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}O_{k}(q)+sum_{k=1}^{infty}dfrac1{(2k-1)^p}dfrac1{(2k-1)^q}\
&=O(p)O(q)-s(q, p)+sum_{k=1}^{infty}dfrac1{(2k-1)^{p+q}}\
&=O(p)O(q)-s(q, p)+O(p+q)
\
end{array}
$
Some additional
definitions and stuff
which might be useful.
$Z_{n}(s)
=sum_{k=1}^n frac1{k^s}
$
$E_{n}(s)
=sum_{k=1}^n frac1{(2k)^s}
=frac1{2^s}sum_{k=1}^n frac1{k^s}
=frac1{2^s}Z_{n}(s)
$
$O_{n}(s)+E_{n}(s)
=sum_{k=1}^{2n} frac1{k^s}
=Z_{2n}(s)
$
so
$O_{n}(s)
=Z_{2n}(s)-E_{n}(s)
=Z_{2n}(s)-frac1{2^s}Z_{n}(s)
$
$O(s)
=O_{infty}(s)
$,
$E(s)
=E_{infty}(s)
$,
$Z(s)
=zeta(s)
=Z_{infty}(s)
$.
$O(s)
=Z(s)-E(s)
=Z(s)-frac1{2^s}Z(s)
=(1-2^{-s})Z(s)
$
$endgroup$
Changing your notation a bit
and playing around.
If
$O_{n}(s)
=1+frac{1}{3^{s}}+dots+frac{1}{(2n-1)^{s}}
=sum_{k=1}^n frac1{(2k-1)^s}
$,
$O(s)
=O_{infty}(s)
$,
and
$s(p, q)
=sum_{n=1}^{infty}dfrac{O_{n}(p)}{(2n-1)^{q}}
$
then
$s(p, q)+s(q, p)
=O(p)O(q)+O(p+q)
$.
Proof.
$begin{array}\
s(p, q)
&=sum_{n=1}^{infty}dfrac{O_{n}(p)}{(2n-1)^{q}}\
&=sum_{n=1}^{infty}dfrac{sum_{k=1}^n frac1{(2k-1)^p}}{(2n-1)^{q}}\
&=sum_{n=1}^{infty}sum_{k=1}^n dfrac1{(2k-1)^p}dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}sum_{n=k}^{infty} dfrac1{(2k-1)^p}dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}sum_{n=k}^{infty} dfrac{1}{(2n-1)^{q}}\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}left(sum_{n=1}^{infty} dfrac{1}{(2n-1)^{q}}-sum_{n=1}^{k-1} dfrac{1}{(2n-1)^{q}}right)\
&=sum_{k=1}^{infty}dfrac1{(2k-1)^p}left(O(q)-O_{k-1}(q)right)\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}O_{k-1}(q)\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}(O_{k}(q)-frac1{(2k-1)^q})\
&=O(p)O(q)-sum_{k=1}^{infty}dfrac1{(2k-1)^p}O_{k}(q)+sum_{k=1}^{infty}dfrac1{(2k-1)^p}dfrac1{(2k-1)^q}\
&=O(p)O(q)-s(q, p)+sum_{k=1}^{infty}dfrac1{(2k-1)^{p+q}}\
&=O(p)O(q)-s(q, p)+O(p+q)
\
end{array}
$
Some additional
definitions and stuff
which might be useful.
$Z_{n}(s)
=sum_{k=1}^n frac1{k^s}
$
$E_{n}(s)
=sum_{k=1}^n frac1{(2k)^s}
=frac1{2^s}sum_{k=1}^n frac1{k^s}
=frac1{2^s}Z_{n}(s)
$
$O_{n}(s)+E_{n}(s)
=sum_{k=1}^{2n} frac1{k^s}
=Z_{2n}(s)
$
so
$O_{n}(s)
=Z_{2n}(s)-E_{n}(s)
=Z_{2n}(s)-frac1{2^s}Z_{n}(s)
$
$O(s)
=O_{infty}(s)
$,
$E(s)
=E_{infty}(s)
$,
$Z(s)
=zeta(s)
=Z_{infty}(s)
$.
$O(s)
=Z(s)-E(s)
=Z(s)-frac1{2^s}Z(s)
=(1-2^{-s})Z(s)
$
answered Jan 3 at 20:43
marty cohenmarty cohen
75k549130
75k549130
$begingroup$
What about $p+q$ being odd?
$endgroup$
– Isak
Jan 8 at 22:37
$begingroup$
I don't see where my answer depends on the parity of p or q.
$endgroup$
– marty cohen
Jan 9 at 22:44
$begingroup$
I was thinking about the general case $sum_{n=1}^{infty}frac{O_{n}^{(p)}}{(2n-1)^{q}}$
$endgroup$
– Isak
Jan 9 at 23:13
$begingroup$
Don't know about that. I was doing my usual playing around and found, to my surprise, the expression with p and q exchanged. So if you know s(p, q), you can get s(q, p).
$endgroup$
– marty cohen
Jan 9 at 23:52
add a comment |
$begingroup$
What about $p+q$ being odd?
$endgroup$
– Isak
Jan 8 at 22:37
$begingroup$
I don't see where my answer depends on the parity of p or q.
$endgroup$
– marty cohen
Jan 9 at 22:44
$begingroup$
I was thinking about the general case $sum_{n=1}^{infty}frac{O_{n}^{(p)}}{(2n-1)^{q}}$
$endgroup$
– Isak
Jan 9 at 23:13
$begingroup$
Don't know about that. I was doing my usual playing around and found, to my surprise, the expression with p and q exchanged. So if you know s(p, q), you can get s(q, p).
$endgroup$
– marty cohen
Jan 9 at 23:52
$begingroup$
What about $p+q$ being odd?
$endgroup$
– Isak
Jan 8 at 22:37
$begingroup$
What about $p+q$ being odd?
$endgroup$
– Isak
Jan 8 at 22:37
$begingroup$
I don't see where my answer depends on the parity of p or q.
$endgroup$
– marty cohen
Jan 9 at 22:44
$begingroup$
I don't see where my answer depends on the parity of p or q.
$endgroup$
– marty cohen
Jan 9 at 22:44
$begingroup$
I was thinking about the general case $sum_{n=1}^{infty}frac{O_{n}^{(p)}}{(2n-1)^{q}}$
$endgroup$
– Isak
Jan 9 at 23:13
$begingroup$
I was thinking about the general case $sum_{n=1}^{infty}frac{O_{n}^{(p)}}{(2n-1)^{q}}$
$endgroup$
– Isak
Jan 9 at 23:13
$begingroup$
Don't know about that. I was doing my usual playing around and found, to my surprise, the expression with p and q exchanged. So if you know s(p, q), you can get s(q, p).
$endgroup$
– marty cohen
Jan 9 at 23:52
$begingroup$
Don't know about that. I was doing my usual playing around and found, to my surprise, the expression with p and q exchanged. So if you know s(p, q), you can get s(q, p).
$endgroup$
– marty cohen
Jan 9 at 23:52
add a comment |
Thanks for contributing an answer to Mathematics Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3060925%2fclosed-form-for-sum-limits-n-1-infty-fraco-np2n-1q-with%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
$begingroup$
These Euler sums are well-known to be solvable (in terms of $zeta$) for $p+qleq 5$ and in other cases (like $p=q$), see The Bible.
$endgroup$
– Jack D'Aurizio
Jan 3 at 20:17
$begingroup$
I'm not sure, which theorem exactly do you have in mind?
$endgroup$
– Isak
Jan 4 at 22:35
$begingroup$
I'm most interested in the case $p=2n,$ $q=2n+1$.
$endgroup$
– Isak
Jan 11 at 22:00