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Dec
9
awarded  Caucus
Dec
4
reviewed Close How $1 + \cos(4 \pi t + \pi) = 1 - \cos 4 \pi t$
Dec
4
reviewed Leave Open number of elements in the quotient ring $\frac{\mathbb{Z}_n[x]}{<ax+b>}$
Dec
4
reviewed Leave Closed Under what condition(s) is the set of all isolated point in a 2nd countable metric space is empty?
Nov
3
reviewed Leave Open How do I prove the following: $f(S\cup T) = f(S) \cup f(T)$
Nov
3
reviewed Leave Open Showing two elements are coprime in a ring of integers
Nov
3
reviewed Close Prove there exist sets $A, B, C, D$ with $(A \cup C) × (B \cup D) \not = (A × B) \cup (C × D)$
Nov
3
reviewed Leave Open Find the set of a given equivalence relation
Nov
3
reviewed Close Limit $\lim_{x \to 0}\frac{\sin(x^2-x)}{x^2-\tan x}$ without l'Hospital
Nov
3
reviewed Close Confusions about Linear Algebra (determinants)
Nov
3
reviewed Close Prove whether this number is or is not prime
Nov
3
reviewed Leave Open Why is a union of n countable sets countable?
Nov
3
reviewed Close Find an n such that the equation $x^2+x=0$ in mod n has 4 solutions
Nov
3
reviewed No Action Needed Probability of 2 complementary angles
Nov
3
reviewed Approve Find equation of the tangent line to $y=x^2$ at the point $x=3$
Oct
31
reviewed Looks OK Where is the following function continuous?
Oct
31
reviewed Close Question on Outer Expectation unequal to Expectation of minimal measurable majorant
Oct
31
reviewed Reopen isotopy of homeomorphisms of a torus
Oct
31
reviewed Close Does a homomorphism $x^k\mapsto k$ exist?
Oct
31
reviewed Leave Open Help showing $\sum_{n=2}^{\infty}(\log n)^{-\log n}$ converges.