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Xiong Jiangnan's user avatar
Xiong Jiangnan's user avatar
Xiong Jiangnan's user avatar
Xiong Jiangnan
  • Member for 3 years, 2 months
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question
5
Prove a space is contractible
Sep 15, 2023
question
5
Second cohomology of nonabelian finite simple group vanishes.
Sep 12
question
3
Is the Axiom of Choice valid for proper class? [duplicate]
Jan 21, 2022
question
3
Ideal class group of $\mathbb{Q}(\sqrt[3]{5})$
Nov 15, 2023
question
3
Hartshorne exercise II.7.13: how to define the morphism $\varphi_a$?
Aug 7
question
2
Compare two definition of $Rf_!$ (derived pushforward with proper support)
Apr 3, 2023
question
2
Classification of curves passing through 7 points. (Hartshorne III ex 10.7)
Jun 7, 2023
question
2
What is special valuation ring?
Nov 24
answer
2
Hartshorne exercise II.6.3(a)
Jan 1, 2023
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2
Prove a space is contractible
Sep 16, 2023
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5
Bar construction in commutative algebras is calculated by pushout