Gottfried Helms
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 Nov 4 accepted $m \in \{2,6,42,1806,…\}$ - a problem of sum-of-$m$'th powers modulo $m$ Oct 30 accepted I've seen “hyperbolic rotation” - from this: generalization to multisection rotation: is this possible? Oct 9 accepted Problem with the application of the fractional integral (as in wikipedia) , example $f(x)=\exp(x)-1$ Sep 25 accepted If I know that a polynomial (of order $k \gt 2$) has at most $1$ positive real root - can I find that easily? Sep 18 accepted Is there a better/closed form for the Cauchyproduct $A^k + A^{k-1}(A+I)/2 + A^{k-2}((A+I)/2)^2 + … +( (A+I)/2)^k$ ($A,I=A^0$ matrices)? Sep 13 accepted What is the name for defining a new function by taking each k'th term of a power series? Aug 13 accepted How to determine the series for $f(x) = \sqrt{1-\sqrt{1+\sqrt{1-\sqrt{1+x}}}}$ around $0$? Jul 23 accepted Iterates of $f_b(x) = x - \log_b(x)$ - for $\log(b) \approx 0.399$: convergence to accumulation points or chaos? Jul 18 accepted Ratio of sum of Euler's totient to $n$: $\lim_{n \to \infty} {\log \left( \sum_{k=2}^n \varphi(k) \right) \over \log(n)}$ Jul 17 accepted Problem with infinite product using iterating of a function: $\exp(x) = x \cdot f^{\circ 1}(x)\cdot f^{\circ 2}(x) \cdot \ldots$ Jul 15 accepted How can I prove that an iterated transformation describes all odd integers? May 20 accepted What is the functional inverse (with respect to $h$ (!)) of $f^{\circ h}(x)={F(h) +x F(h-1) \over F(1+h) +x F(h) }$? May 15 accepted Half order derivative of ${1 \over 1-x }$ May 8 accepted $f(x)=\tanh(1+\tanh^{-1}(x))$ or $f:\tanh(x) \to \tanh(x+1)$ is a rational function? Apr 16 accepted Sum of the Stieltjes constants? (divergent summation) Apr 5 accepted Exercising divergent summations: $\lim 1-2+4-6+9-12+16-20+\ldots-\ldots$ Mar 10 accepted Having $A_1=a+b+c$,$A_2=a^2+b^2+c^2$, $A_3=a^3+b^3+c^3$ - how to get $a,b,c$? Feb 20 accepted How can I prove my conjecture for the coefficients in $t(x)=\log(1+\exp(x))$? Jan 21 accepted How to relate this integral for the $\Gamma$ function to the defining integral of the $\Gamma$ Jan 15 accepted Convergence radius of $\log(\Gamma(\exp(x)))$?