Mathematics
Justin Young
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19
CW complex structure of the projective space $\mathbb{RP}^n$
Sep 12 '12
15
Is closure of convex subset of $X$ is again a convex subset of $X$?
Sep 26 '12
15
What tells rational cohomology about integral cohomology?
Oct 27 '11
13
Why do we ask that condition in Kan complex?
Mar 25 '14
12
Proving that a subgroup of a finitely generated abelian group is finitely generated
Apr 26 '12
10
Explicit isomorphism $\tilde{H_n}(X)\simeq \tilde{H}_{n+1}(SX)$.
May 2 '12
7
Chern Classes and Stiefel-Whitney Classes
May 1 '12
7
show $2^{2^n} + 1 \equiv 2 \pmod{2^{2^m} + 1} $ with $0<m<n$
May 22 '12
6
Show that for any positive integer $n$ there is $x \in [0,1-\frac{1}{n}]$ for which $f(x) = f(x+\frac{1}{n})$
Feb 23 '16
6
Prove that $\left\{(x,y)\in \mathbb R^2: \ x^2-xy+y^2-1=0\right\}$ is a closed and bounded set.
Apr 18 '17
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Defining terms in philosophy?

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