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2h
revised Expressing the second Hirzebruch surface $F_2$ in terms of $SO(3)$
added 4 characters in body; edited title; edited tags
2h
answered Expressing the second Hirzebruch surface $F_2$ in terms of $SO(3)$
5h
comment Compact support vs. vanishing at infinity?
@astudent: You're welcome.
7h
awarded  Nice Answer
13h
revised Compact support vs. vanishing at infinity?
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14h
answered Compact support vs. vanishing at infinity?
17h
reviewed Reviewed Venn Diagrams Set Theory Explanations
23h
comment Period matrix of abelian surface
This isn't an action of $\mathbb{Z}^2$.
1d
revised If $m$ divides $n$, find a free resolution of $\mathbb{Z}/m$ as a $\mathbb{Z}/n$-module.
edited tags
1d
revised If $m$ divides $n$, find a free resolution of $\mathbb{Z}/m$ as a $\mathbb{Z}/n$-module.
added 2 characters in body
1d
reviewed Reviewed Is there an elementary proof that $\sum \limits_{k=1}^n \frac1k$ is never an integer?
2d
reviewed Leave Closed How to evaluate the integral $\int^{1/2}_0\int^{1-x}_x (x+y)^9(x-y)^9 \, dy \, dx$?
Jul
27
revised Extending a homotopy equivalence
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Jul
27
answered Extending a homotopy equivalence
Jul
27
revised If $m$ divides $n$, find a free resolution of $\mathbb{Z}/m$ as a $\mathbb{Z}/n$-module.
edited title
Jul
27
revised If $m$ divides $n$, find a free resolution of $\mathbb{Z}/m$ as a $\mathbb{Z}/n$-module.
added 1944 characters in body
Jul
27
revised If $m$ divides $n$, find a free resolution of $\mathbb{Z}/m$ as a $\mathbb{Z}/n$-module.
added 96 characters in body
Jul
27
answered If $m$ divides $n$, find a free resolution of $\mathbb{Z}/m$ as a $\mathbb{Z}/n$-module.
Jul
27
comment How to recover the cohomology of a torus from its description of a quotient
You can certainly calculate $H^1(T_{\Gamma}, \mathbb{R})$ using the fact that $\pi_1(T_{\Gamma}) = \Gamma$: $$H^1(T_{\Gamma}, \mathbb{R}) = \operatorname{Hom}(\pi_1(T_{\Gamma}), \mathbb{R}) = \operatorname{Hom}(\Gamma, \mathbb{R}) = \operatorname{Hom}(\mathbb{Z}^n, \mathbb{R}) = \mathbb{R}^n.$$
Jul
27
reviewed Close Magnitude of a complex number