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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 Nicolas Choquet problem of bottles
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
Jun
5
comment What's $[L:K(\alpha)]$ here?
Are you familiar with the theorem of Artin that says that for a field $E$ and a finite group of automorphisms $G$ that $E/E^G$ is a Galois extension?
May
26
awarded  Nice Answer
May
19
awarded  Popular Question
May
3
awarded  Popular Question