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Mathematics
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HK Lee's user avatar
HK Lee's user avatar
HK Lee
  • Member for 12 years, 1 month
  • Last seen more than a month ago
  • South Korea
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Top posts
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answer
28
A manifold for Hilbert's hotel
Oct 12, 2016
question
23
Is $\mathbb Z _p^*=\{ 1, 2, 3, ... , p-1 \}$ a cyclic group?
Jan 30, 2013
answer
21
Minimum of two metrics is metric
Nov 28, 2013
answer
17
I need some help with the integral $\int_0^\infty \frac{x^3}{e^x+1} \, dx$
May 16, 2019
answer
14
Tiling a cylindrical piece of paper
Oct 16, 2016
question
12
$ a+b+c=0,\ a^2+b^2+c^2=1$ implies $ a^4+b^4+c^4=\frac{1}{2}$
Apr 13, 2018
answer
11
multivariable limit of $\frac{x^2-y^2}{\sqrt{x^2+y^2}}$
Apr 13, 2015
answer
11
The Sphere Does Not Admit a Metric Isometry into a Euclidean Space.
Jun 26, 2017
answer
10
Show that $g(a) = g(b) = 0,\ \int_a^b f(x)g(x)dx=0 $ implies $f(x)=0$
Apr 11, 2015
answer
9
The shortest curve that divides the unit sphere into two regions of equal area
Sep 19, 2020
Top network posts
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7
Positively curved metrics on $S^2\times S^2$
6
Orbifold vs Alexandrove space vs Limit of manifolds
5
Hausdorff dimension of convex set in ${\bf R}^n$