# Gottfried Helms

 1,351 Reputation 892 views

## Registered User

 Name Gottfried Helms Member for 2 years Seen 2 hours ago Website Location Germany Age 60
Mathematics is only a hobby - although I have done undergrad courses in the 70ties. But part of my job was doing statistics and this kept me near my favourite subject "linear algebra" (programmed factor-analysis and a matrix-orientated calculator MatMate). Around 2002 I came in contact with the internet-community in math-newsgroups and could improve my Collatz-discussion. Next subject was the Bernoulli-numbers, then integer matrices and since 2006 the problem of iterated exponentiation aka tetration. Serving half-term jobs in teaching here at the university I found time to fiddle with that subjects in depth - and found love with the exploratory approach and impulse of the 18'th century numbertheory, namely L.Euler, "the master of us all"... Due to lack of formal education I've to do my "research" widely on my own - but that's what I just like: to find structure, pattern, laws from the ground.
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# Questions

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### Efficient (divergent) summation for sum of zetas at negative arguments?

apr 19 at 22:51 i707107 79438

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### mertens-function in the light of divergent summation - what summation method were best adapted

jan 28 12 at 22:21 remote 1

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### $f(x) \ne g(x)$ but $f(f(x))=g(g(x))$ - is there a name/some discussion of this property?

aug 30 11 at 8:30 Gottfried Helms 1,3511310

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### Can the relative count of the primefactors in $\small \lim_{w\to\infty}\prod_{k=1}^w (p_k-1)$ be determined analytically?

jun 20 at 1:00 Gottfried Helms 1,3511310

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### Is that series-transformation known in the context of divergent summation?

mar 10 11 at 16:16 Gottfried Helms 1,3511310

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### For an approach to the Hadamard-matrix-problem: is there a proof, that the iterative plane-wise orthogonal rotations (Quartimax/Varimax) converge to global maximum?

mar 8 12 at 16:13 Gerhard Paseman 811155

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### How to check numerical precision of my computation of Stieltjes-constants?

aug 27 at 6:22 Gottfried Helms 1,3511310

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### What is the (fractional) half-derivative of zeta at $s=0$ (and how to compute it)?

may 4 at 18:46 quid 13k3151

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### What are conditions to make f(x) defined by f(x)=f(x-1)*x + 1/e unique(for instance convex)?

nov 24 10 at 15:22 MathOverflow 123

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### “Bell” or “Jabotinsky”-matrix - What’s the canonical name (if any)?

oct 15 at 10:12 Gottfried Helms 1,3511310

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