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Sep
8
reviewed Looks OK Mathematical Induction problem
Sep
8
reviewed Edit How every element of a group generates a cyclic subgroup?
Sep
8
revised How every element of a group generates a cyclic subgroup?
formatting
Sep
8
reviewed Leave Open Left multiplication by invertible matrix.
Sep
8
reviewed Reviewed subset problem (set theory)
Sep
8
reviewed Close For what integer $e$ is a group $G$ necessarily Abelian?
Sep
7
reviewed Leave Open Function $f(x)$ such that $f(x-i)+f(x)=\frac{1}{x^2}$
Sep
7
reviewed No Action Needed How to solve this equality for $S$
Sep
7
reviewed Reject $a+b\sqrt{2}$ not a root of monic polynomial over $\mathbb{Z}$
Sep
7
reviewed Approve Localness of the UFD Property
Sep
7
reviewed Approve Map Earth surface so straight line distance is great circle distance?
Sep
7
reviewed Leave Open Electric field of a spherical shell
Sep
6
reviewed Approve To check if a number is n choose r
Sep
6
reviewed No Action Needed Solution to Singular Integral
Sep
6
reviewed Leave Open Limit of the sequence
Sep
6
reviewed Leave Open if its true for $n$ is it true for $n-1$ (mathematical induction)?
Sep
6
comment Why is compactness so important?
Essentially, compactness is "almost as good as" finiteness. I can't think of a good example to make this more precise now, though.
Sep
6
reviewed Close Evaluate $ \int \cfrac { \sec^2x}{ ( \sec x + \tan x)^{9/2}}dx $
Sep
6
reviewed Close REVISTED$^2$: Fraction Existence Proof
Sep
6
awarded  Custodian