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Eric Ley's user avatar
Eric Ley's user avatar
Eric Ley's user avatar
Eric Ley
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I'm interested in low dimensional topology.

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question
7
Continuous surjection $\mathbb R^m\to \mathbb R^n$ that is not a quotient map
Jul 27
answer
7
How to solve $\int_0 ^1 \left( \frac{x^2}{1+x^2} \right)\frac{1-x\tan(x)+ \tan(x)-x}{1 -x\tan(x)-\tan(x)-x}dx$?
Mar 2
answer
5
Every continuous function from $\mathbb{R}$ to $\mathbb{R}$ is a quotient map
Jul 31
answer
4
$\sum_{k=0}^{n-1}\cos^m\frac{2\pi k}{n}$
Aug 10
question
4
When is $\text{gr}(V)\cong V$?
Mar 6
answer
4
Prove that the polynomial $f(x)=P\left(x\right)+P'\left(x\right)+...+P^{(n+1)}\left(x\right)$ has no real roots
Feb 3
question
4
When can a homotopy lift to its compactification?
Mar 11
question
3
Action of symmetry group on homology?
Nov 13, 2023
question
3
Why the bridge index of $8_{10}$ is 3?
Nov 26, 2023
question
3
Generic intersection of hyperplanes
Apr 6