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comment Proof that a product of two quasi-compact spaces is quasi-compact without Axiom of Choice
It looks like you are claiming that the $U$ you construct in the second paragraph is adequate, but I don't see it very clearly. In particular, there seems to be an implicit claim that $U \times X \subset W_1 \cup \cdots \cup W_n$.
Apr
16
answered What is $\lim_{n\to\infty} \displaystyle \sum_{k=0}^{\lfloor n/2 \rfloor} \binom{n}{2k}\left(4^{-k}\binom{2k}{k}\right)^{\frac{2n}{\log_2{n}}}\,?$
Apr
9
awarded  Excavator
Apr
9
awarded  Editor
Apr
9
revised In the history of mathematics, has there ever been a mistake?
Perko wrote me to request this correction.
Apr
9
suggested suggested edit on In the history of mathematics, has there ever been a mistake?
Mar
12
comment On $\int_{-\infty}^{+\infty} {\frac{\tan(t-t_0)}{\cosh^2(t-t_0)} \cos(\omega t) \,\mathrm{d}t}$
How did this question arise? What have you tried?
Jan
23
comment In the history of mathematics, has there ever been a mistake?
@Zarrax Ken Perko vehemently denies having a PhD in math.
Dec
12
answered Constructible set in Gieseker's 'Lectures on Moduli of Curves'
Nov
6
awarded  Yearling
Sep
22
comment On a abelian representation of galois group
It might help to think of the Galois group as a projective limit of finite groups coming from finite Galois extensions, instead of some abstract group of automorphisms of an algebraically closed field.
Sep
17
answered Is a subring of an integral monoid ring an integral monoid ring?
Sep
10
comment Monotonic log det function?
What is $\sigma$?
Sep
10
comment Why Euler-Lagrange equation does not depend on the second derivative of the function?
See en.wikipedia.org/wiki/…
Jun
29
comment Cutting the $2$-dimensional real Projective Space
The projective plane is the quotient of $S^2$ by the antipodal map, and cutting out a non-contractible cycle corresponds to removing the equator in the sphere.
Feb
13
awarded  Citizen Patrol
Feb
13
comment How to bound the maximal consecutive length in a random subset of [n] as function of n?
Concerning the usual reasons: On MathOverflow, we're getting flags claiming that this user's questions come from a take-home exam that is in progress.
Nov
6
awarded  Yearling
Aug
20
awarded  Enlightened
Aug
20
awarded  Nice Answer