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 Sep24 awarded Autobiographer Jul2 awarded Curious Jun4 comment Quadratic residue modulo $p$ iff quadratic residue module $p^k$ No, but if I knew that, would there be a simple argument? May31 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 May31 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 May31 asked Quadratic residue modulo $p$ iff quadratic residue module $p^k$ Jan22 accepted Binomial thinning of geometric distribution Jan22 asked Binomial thinning of geometric distribution Jan10 comment Mapping cylinder is a CW complex @JustinYoung: Thanks, I will try to do as you tell! Jan10 awarded Promoter Jan9 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? Jan9 revised Mapping cylinder is a CW complex What I have done Dec30 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. Dec30 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... Dec30 revised Mapping cylinder is a CW complex edited title Dec30 awarded Informed Dec30 revised Mapping cylinder is a CW complex added 4 characters in body Dec30 awarded Citizen Patrol Dec30 revised Mapping cylinder is a CW complex not a duplicate! thanks Dec29 comment Mapping cylinder is a CW complex This is the reference which is mentionned, it does not answer the question.