Discussion on "tetra-eta-series" (2007) in MO
#18
As I'm waiting for the detailed graphs of \(\nu(s)\) and \(T(-s,2) = P(s)\)... I'll write some graphs on growth.

We recall that:

\[
\begin{align}
q(m) &= (-1)^m\sum_{n \le m} \chi_{m}(n)\\
Q(x) &= \sum_{m \le \lfloor x \rfloor} q(m)\\
\nu(s) &= \sum_{m=1}^\infty q(m) m^{-s}\\
&= -s\int_1^\infty Q(x)x^{-s-1}\,dx\\
\end{align}
\]

Then, we're going to graph \(Q\) in the mean time:

   

This is a graph of \(Q(x)\) for \(x=1\) up to \(x=1000\). Notably, it never breaches the value \(|Q(x)| > 8\). This function has at most a growth of \(\log(x)\) as I predicted Cool  But it could even be \(O(1)\). The growth \(\log(x)\) or something close, means that \(\nu(s)\) is holomorphic for \(\Re(s) > 0\).


The second function is Gottfried's zeta function, and the growth of its coefficients.

\[
\begin{align}
g(m) &= (-1)^m\sum_{n \le m} \frac{\log(n)^{\frac{\log(m)}{\log(n)}}}{\frac{\log(m)}{\log(n)}!}\chi_{m}(n)\\
A(x) &= \sum_{m \le \lfloor x \rfloor} g(m)\\
P(s) &= \sum_{m=1}^\infty g(m) m^{-s}\\
&= -s\int_1^\infty A(x)x^{-s-1}\,dx\\
\end{align}
\]

The next graph is \(A(x)\) over \(x=1\) upto \(x=1000\), and you will again notice that it is about \(\log(x)\) in growth!

[To be posted when this shit finishes compiling. It is taking wayyyyyyyyy longer than I thought it would. And I don't want to lose this post. Either way, it's going to look like \(Q(x)\), as my calculator is saying. The value \(Q(x)\) is only a little off from \(A(x)\). But the run time to get \(A(x)\) is much longer...]

EDIT: As soon as I wrote that disclaimer, the program compiled 30 mins later:

   

This is exactly \(\log(x)\). It doesn't break \(|A(x)| > 8\)--it's just a tad more chaotic.



Here is the basic code I am using:


.gp   zeta2.gp (Size: 6.4 KB / Downloads: 444)

Open it in a text editor before compiling and running. The read me is in the comments of the source.



Please observe, what I mean is that:

\[
\sup_{0 \le x \le X} |A(x)| \le C\log(X)\\
\]

And, the example I used is:

\[
\sup_{0 \le x \le 1000} |A(x)| \le 8\\
\]

Where at worst, we grow just as slow.........
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Messages In This Thread
RE: Discussion on "tetra-eta-series" (2007) in MO - by JmsNxn - 02/08/2023, 09:21 AM

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