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Pierre-Yves Gaillard
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question
100
What if Current Foundations of Mathematics are Inconsistent? [closed]
Oct 3, 2010
question
86
Are there non-scalar endomorphisms of the functor $V\mapsto V^{**}/V$?
Apr 2, 2014
answer
56
Quick proofs of hard theorems
May 18, 2010
question
48
What is your favorite proof of Tychonoff's Theorem?
May 30, 2010
question
27
Is every commutative ring a limit of noetherian rings?
Feb 13, 2019
answer
21
Dimension of infinite product of vector spaces
May 30, 2014
question
20
Example of an additive functor admitting no right derived functor
Mar 20, 2017
question
19
Is $K[[x_1,x_2,\dots]]$ an $\mathfrak m$-adically complete ring?
Aug 14, 2018
question
19
If $\mathcal C^{\mathcal C}$ is equivalent to $\mathcal C$, is $\mathcal C$ necessarily equivalent to a category with one object and one morphism?
Jun 18, 2019
answer
18
Errata for Atiyah–Macdonald
Oct 24, 2010
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63
Simultaneous diagonalization of commuting linear transformations
42
Examples of patterns that eventually fail
33
Why is the difference of distinct roots of irreducible $f(x)\in\mathbb{Q}[x]$ never rational?
32
How to show that $\det(AB) =\det(A) \det(B)$?
27
What is the origin of the expression “Yoneda Lemma”?