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jdc
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37
Why would I define Alexander–Spanier cohomology?
Mar 2, 2015
27
Atiyah-Macdonald Exercises 5.16-5.19
Mar 3, 2011
19
Proof behind $S^n\cong SO(n+1)/SO(n)$
Jun 17, 2014
13
Does inclusion of a ring into a polynomial ring induce a closed map on prime spectra?
Feb 15, 2011
13
Exercise 11.5 from Atiyah-MacDonald: Hilbert-Serre theorem and Grothendieck group
Oct 20, 2012
11
Explanation for a line from a MathOverflow answer
Mar 13, 2014
11
Why is cohomology the direct product of the $H^n$?
Aug 23, 2016
11
Chern-Weil: why do we divide by $2\pi$?
May 5, 2014
10
Derived functors of abelianization
Aug 23, 2016
8
Tor for graded modules over a graded ring
May 26, 2014
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5
Etiquette and feasibility of re-asking questions on MathOverflow
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128
My student's family won't let her study what she wants
50
What is the current understanding regarding complex structures on the 6-sphere?
33
How to acknowledge unhelpful conversations
31
The central insight in the proof of the existence of a class of Kervaire invariant one in dimension 126
20
Torsion in the Atiyah–Hirzebruch spectral sequence of a classifying space