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user2035
  • Member for 14 years, 5 months
  • Last seen more than 10 years ago
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answer
45
Affine scheme on spec(A) of a ring A as the sheafification of a pre-sheave on spec(A)?
Nov 10, 2011
answer
28
Hom(A,C) ⊗ Hom(B,D) injects into Hom(A⊗B,C⊗D): when? why?
Aug 3, 2011
answer
26
Why is the identity element of a group denoted by $e$?
Feb 7, 2012
answer
14
Existence of projective resolutions in abelian categories
Dec 7, 2009
answer
14
For any $n$, does there exist a number field with at least $n$ solutions to the unit equation
Oct 9, 2011
answer
11
Is $H^i(X,F)$ finitely generated over $\Gamma(O_X)$ if $F$ is coherent?
Feb 25, 2012
answer
10
Endomorphisms of vector bundles
Dec 6, 2009
answer
10
reduced ⊗ reduced = reduced; what about connected?
Dec 20, 2009
answer
10
two conjugate subgroups and one is a proper subset of the other? plus, a covering space interpretation.
Jan 15, 2010
answer
8
Does every nontrivial sheaf of rings have a maximal ideal?
Aug 2, 2010