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 Oct 19 awarded Popular Question Oct 2 awarded Nice Question Sep 24 awarded Autobiographer Jul 2 awarded Curious Jun 4 comment Quadratic residue modulo $p$ iff quadratic residue module $p^k$ No, but if I knew that, would there be a simple argument? May 31 comment Quadratic residue modulo $p$ iff quadratic residue module $p^k$ Unfortunately I am not familiar with the Lemma and hoped getting away without using it... I will have a precise look at it if there is no other easy solution :) and yes, my previous comment is wrong. Thanks May 31 comment Quadratic residue modulo $p$ iff quadratic residue module $p^k$ e.g. if $k=1$, write $x^2=a+pr$ and show that $r$ is divisible by 2 by looking at $x^2=a+pr \;(\text{mod }2)$ right? thank you May 31 asked Quadratic residue modulo $p$ iff quadratic residue module $p^k$ Jan 22 accepted Binomial thinning of geometric distribution Jan 22 asked Binomial thinning of geometric distribution Jan 10 comment Mapping cylinder is a CW complex @JustinYoung: Thanks, I will try to do as you tell! Jan 10 awarded Promoter Jan 9 comment Mapping cylinder is a CW complex @Carsten Schultz: I see what is happening, but I can't prove formally that the k-skeleton really is the one you describe, could you help me with that please? Jan 9 revised Mapping cylinder is a CW complex What I have done Dec 30 comment Mapping cylinder is a CW complex @Grigory M: Yes, but I don't understand exactly what is happening. As we are only working with $X\sqcup I$ here, I thought it would maybe give me some intuition understanding this particular case first. Dec 30 comment Mapping cylinder is a CW complex ok, thanks. I don't know exactly how it works once a question has been declared a duplicate by five people and it is in fact not... Dec 30 revised Mapping cylinder is a CW complex edited title Dec 30 awarded Informed Dec 30 revised Mapping cylinder is a CW complex added 4 characters in body Dec 30 awarded Citizen Patrol