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Zhen Lin's user avatar
Zhen Lin's user avatar
Zhen Lin
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36
Is there a good general definition of "sheaves with values in a category"?
Apr 5, 2021
35
What is the theory of local rings and local ring homomorphisms?
Feb 28, 2012
29
The $(\infty, 1)$-category of all topological spaces, including the bad ones
Feb 5, 2022
26
Can the Category of Schemes be Concretized?
Mar 18, 2014
25
Sheaf-theoretic approach to forcing
Mar 4, 2021
24
Are there axioms satisfied in commutative rings and distributive lattices but not satisfied in commutative semirings?
Sep 10, 2020
23
Is the category commutative monoids cartesian closed?
Jul 12, 2013
23
Axiom of choice as zero dimensionality
Dec 30, 2015
22
When is the opposite of the category of algebras of a Lawvere theory extensive?
Dec 29, 2021
21
Connected and locally connected, but not path-connected
Oct 16, 2013

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Why doesn't a \smash'd \check show on a \tag'd formula?

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132
What concept does an open set axiomatise?
101
Sheaf cohomology: what is it and where can I learn it?
74
Why did my friend lose all his money?
70
Simplicial homology of real projective space by Mayer-Vietoris
62
Why is the category of fields seemingly so poorly behaved?