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visits member for 3 years, 9 months
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33m
answered Topological invariance of chern classes
2h
answered Homology Whitehead theorem for non simply connected spaces
Feb
2
answered How prove this $\sum_{k=0}^n \binom{n}{k} \binom{(p-1)n}{k} \binom{pn+k}{k} = \binom{pn}{n}^2 $
Jan
19
wiki created cohomological-operations excerpt
Jan
19
asked Ramanujan-type trigonometric identities with cube roots, generalizing $\sqrt[3]{\cos(2\pi/7)}+\sqrt[3]{\cos(4\pi/7)}+\sqrt[3]{\cos(8\pi/7)}$
Jan
19
answered Number of matrices with weakly increasing rows and columns
Jan
18
wiki created topological-k-theory excerpt
Jan
18
wiki created classifying-spaces excerpt
Jan
18
wiki created characteristic-classes excerpt
Jan
17
answered Are there degree-1 maps from $S^2 \times S^3 \rightarrow S^5$ or from $S^5 \rightarrow S^2\times S^3$?
Jan
15
answered Understanding the Gamma function?
Jan
12
answered Are space of paths between two different points and space of pointed loops only homotopy equivalent? What about smooth case?
Jan
11
answered A (somewhat) conceptual proof that the boundary of a fundamental class of a manifold with boundary goes to a fundamental class?
Jan
4
answered Special Cases of Quadratic Reciprocity and Counting Fixed Points
Jan
2
answered Explicit formula for Fermat's 4k+1 theorem
Jan
1
answered Ramanujan Notebook Part 1 (1.16): $\sum q^{n^2} = (-q;q^2)_\infty^2(q^2;q^2)_\infty=\frac{(-q;-q)_\infty}{(q;-q)_\infty}$
Jan
1
asked Recurrence $(n+2)\text{Cat}_{n+1}=(4n+2)\text{Cat}_n$ for non-crossing matchings
Dec
30
answered Cup Product Structure on the Projective Space
Dec
29
answered Invariant homology classes
Dec
27
answered Why homology with coefficients?