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23h
reviewed Approve Is the $C^0$-fine topology finer than the metric topology?
Apr
2
reviewed Approve In $P^n$(projection of $C^{n+1}$) is a variety isomorphic to $P^1$ irreducible?
Mar
30
reviewed Approve how to calculate what I need for final exam
Jan
26
comment Show that if $v\in (V_c)^{\perp}$ then $(Av)\in (V_c)^{\perp}$ for a normal matrix $A$ with an eigenvalue $c$
$\langle x, Av \rangle = \langle x, v c \rangle = ....$
Jan
25
reviewed Approve Bounding summations
Jan
23
awarded  Good Question
Jan
21
reviewed Approve Evaluating the limit $\displaystyle \lim _{x\to \infty }\frac{(x^2+1)}{(x-1)}\sin(\frac{1}{x})$
Jan
17
reviewed Reject What is the intuition behind the exponential distribution?
Jan
15
comment Proving compactness of an operator
You can use ideas from this question math.stackexchange.com/questions/320751/….
Jan
15
reviewed Approve on the definition of graded Betti numbers
Jan
15
comment Show that $|z+w|^2$ + $|z-w|^2$ = $2|z|^2 + 2|w|^2$
This is Parallelogram law.
Jan
12
comment Bounding $\frac{2}{\pi}\int_0^{\pi}\frac{|\sin(n+\frac{1}{2})t|}{2\sin\frac{1}{2}t}$ below by $\frac{4}{\pi^2}\log n$
From which book is this?
Jan
9
awarded  Yearling
Dec
28
reviewed Approve Likelihood Ratio and Neyman-Pearson factorization theorem
Dec
28
reviewed Reject Prove that $\frac{\sin n}{n}$ is a Cauchy sequence from the definition.
Dec
28
answered $f(x):S^{2n} \rightarrow S^{2n}$ continuous so that there is $x \in S^{2n}$ with $f(x)=x$ or $f(x)=-x$
Dec
26
reviewed Approve What is the explicit obstruction to almost sure convergence in stochastic integrals?
Dec
23
comment Is the indicator function of the rationals Riemann integrable?
It's not Riemann integrable. Btw. this is known as Dirichlet function as far I know.
Dec
21
reviewed Approve Proving that if the semigroup (A, *) is a group, then the relation is an equivalence relation.
Dec
19
awarded  Constituent