Wikipedia:Reference desk/Archives/Mathematics/2012 December 4

Welcome to the Wikipedia Mathematics Reference Desk Archives
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages.

December 4

Translation of german reference

I really need this paper Homologie nicht-additiver Funktoren by Dold & Puppe, but it's in german. Here's the wikipedia link. Does anyone know any way I can get a english translation? Google certainly doesn't help. Money is tight (talk) 10:19, 4 December 2012 (UTC)

File:Comparison_convolution_correlation.svg

Visual comparison of convolution, cross-correlation and autocorrelation

On File_talk:Comparison_convolution_correlation.svg and User_talk:Cmglee#g_function_-_wrong_direction, some editors have commented that the convolution function should be horizontally flipped (if I understand correctly), making it look exactly like the cross-correlation function.

I remember studying it differently (as drawn). Are the comments correct, so the small blue lines should be horizontally flipped (resulting in no difference as it is horizontally symmetric) and the small red lines should not?

Thanks! cmɢʟee୯ ͡°  ͜১͡° ੭ 19:42, 4 December 2012 (UTC)

Zeta (1/2)

How is the zeta function of a half calculated? In fact, how is the zeta function of any number between zero and one calculated?! — Preceding unsigned comment added by 86.136.129.187 (talk) 23:30, 4 December 2012 (UTC)

Depends on what do you mean by “calculated”. There are all kinds of formulas for Riemann zeta which are valid inside the critical strip, such as $\zeta (s)=(1-2^{1-s})^{-1}\sum _{n=1}^{\infty }(-1)^{n+1}n^{-s}$. You can find more in Riemann zeta function#Representations.—Emil J. 15:37, 5 December 2012 (UTC)