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Some random guy
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question
42
Alternative proofs that two bases of a vector space have the same size
Aug 30, 2025
question
16
Softest proof that every group is the fundamental group of a space
Jun 12, 2025
question
14
Exotic sphere without smooth antipodal map
Apr 30, 2025
question
14
A K(G,1) that is not homotopy equivalent to a CW complex
Nov 18, 2025
question
11
Homotoping a self-map to the identity one piece at a time
Mar 10, 2025
question
8
Hochschild-Serre spectral sequence for completed cohomology (after F. Calegari)
Mar 4, 2025
question
8
Explicit smooth complex projective variety with fundamental group the finite cyclic group $C_d$
Apr 29, 2025
question
7
Map from SO to $\mathbb{RP}^{\infty}$ detecting fundamental group
Jun 28, 2025
question
6
Composition and compactly generated spaces
Sep 22, 2025
question
5
Holomorphic fiber bundles with holomorphic and non-holomorphic sections
Oct 29, 2025