Divergent Series and Analytical Continuation (LONG post)
#40
Okay, so I'm going to call the Error function \(E^m(x)\). And I'll describe it in full detail.

Let's call the function:

\[
F^m(x) = \sum_{k=1}^\infty F_{-k}^m x^k = \sum_{k=1}^\infty x^k \sum_{d | k} h_m(d) \frac{(-1)^{m+d}}{2^{k/d}}\\
\]

Then, we will call:

\[
E^{m}(x) = f_m(x)-f_m(0) +(-1)^{m+1} F^m(x)\\
\]

For \(m=1,2\) this function is just \(0\). For \(m=3,4\) it's the same function. For \(m=4,5\) it gets a bit wilder. And as I continue shit starts to get a bit divergey; but that's because I'm doing quick calculations and avoiding large number calculations.

All the coefficients are rational of \(E^m\); and it looks pretty god damn nice, regardless of \(m\). But it also looks pretty random with the placement of these rational coefficients.

Also, it's super super suspect; that the only values which are nonzero are when \(m > 2\); which is just like modular functions--the Eisenstein series is only interesting when \(m > 2\).

The coefficients of \(E^m(x)\) also just seem to be:

\[
a_{mk}/2^k\\
\]

where \(a_{mk}\) is a natural number. So I may be missing an extra term that doesn't appear for \(m=1,2\). Jesus this shit is annoying.




NVM

I figured it out. And I can explain the difference.

Let's write:

\[
f_m^{k}(0) = B_k^m\\
\]

Where:

\[
f_m(x) = \sum_{k=0}^\infty B_k^m x^k\\
\]

Then:

\[
f_m(x) = \sum_{n=0}^\infty \frac{x^n}{\left(1+x^n\right)^m} \frac{1}{2^n}\\
\]

But it also equals:

\[
f_m(x) = \sum_{j=0}^\infty \sum_{n=0}^\infty (-1)^j x^{nj} \frac{x^n}{\left(1+x^n\right)^{m-1}}\frac{1}{2^n}\\
\]

This produces a SIMILAR recursive equation as with \(F_{-k}^m\), but it is not the same. We gather some extra terms Big Grin
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Messages In This Thread
RE: Divergent Series and Analytical Continuation (LONG post) - by JmsNxn - 03/05/2023, 10:31 PM

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