JSchlather
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 9h awarded Nice Question Mar 18 awarded Enlightened Mar 18 awarded Nice Answer Mar 16 awarded Revival Sep 16 awarded Yearling May 26 reviewed Reopen If $A$ and $B$ are subgroups of a group $G$, is their product also a subgroup of $G$? May 26 reviewed Leave Open Proving $\gcd(N^a-1,N^b-1)=N^{\gcd(a,b)}-1$. May 26 reviewed Leave Open How to prove $\sum\limits_{i=0}^n (-1)^i \binom{n}{i} \binom{n-i}{k}=0$ May 26 reviewed Close Given positive integers a and b such that $a\mid b^2, \:b^2\mid a^3, \:a^3\mid b^4,\: b^4\mid a^5$…, prove $a=b.$ May 26 reviewed Leave Open Testing convergence of $\sum\limits_{n=2}^{\infty} \frac{\cos{\log{n}}}{n \cdot \log{n}}$ May 26 revised In a metric space, if a set is compact, then it is closed: improving proof Improved phrasing. Feb 24 awarded Necromancer Dec 26 awarded Nice Answer Dec 16 awarded Nice Answer Dec 15 revised Field containing all square roots of rational numbers added 1 character in body Sep 30 awarded Explainer Sep 24 awarded Autobiographer Sep 16 awarded Yearling Jul 2 awarded Curious Jun 5 answered Examples of metric spaces in which every non-empty open set is uncountable