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 Mar 3 comment Symbol for elementwise multiplication of vectors Also related: tex.stackexchange.com/questions/19180/… Sep 25 accepted formal languages: what does R-trivial mean? Sep 25 accepted mean and variance normalization of vectors Aug 23 awarded Tumbleweed Aug 16 asked sound FFT data to PCM data Feb 18 awarded Revival Oct 21 awarded Teacher Oct 21 answered Is there a common symbol for concatenating two (finite) sequences? Sep 24 awarded Autobiographer May 16 revised mean and variance normalization of vectors added 147 characters in body May 14 revised mean and variance normalization of vectors edited tags May 14 asked mean and variance normalization of vectors Dec 14 comment How $x^4$ is strictly convex function? Note that the second derivative is positive almost everywhere. I'm pretty sure that this is also enough to get strict convexity. Jun 8 accepted writing $M : \Gamma_{n,0} \backslash \Gamma_n$ May 24 revised writing $M : \Gamma_{n,0} \backslash \Gamma_n$ better matrix May 24 revised writing $M : \Gamma_{n,0} \backslash \Gamma_n$ added 84 characters in body May 24 revised notation for invariation added 134 characters in body May 24 comment How to write presentation of a group? Why do you write $e_i^2 = 1, e_i e_j = e_j e_i$? Couldn't you just write $e_i \in \mathbb{Z} / 2 \mathbb{Z}$? Or, if you want to have representations, $e_i \in \{0,1\}$? That somewhat seems simpler to me. May 24 asked notation for invariation May 24 asked writing $M : \Gamma_{n,0} \backslash \Gamma_n$