Mathematics
Pierre-Yves Gaillard
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Email: pierre.yves.gaillard at gmail.com

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50
Simultaneous diagonalization of commuting linear transformations
Aug 9 '11
39
Examples of patterns that eventually fail
Feb 21 '12
33
Why is the difference of distinct roots of irreducible $f(x)\in\mathbb{Q}[x]$ never rational?
Dec 1 '11
29
How to show that $\det(AB) =\det(A) \det(B)$?
Aug 28 '11
24
What is the origin of the expression “Yoneda Lemma”?
Jul 25 '11
24
About a paper of Zermelo
Aug 1 '11
23
Did Zariski really define the Zariski topology on the prime spectrum of a ring?
Aug 3 '11
23
An integrable and periodic function $f(x)$ satisfies $\int_{0}^{T}f(x)dx=\int_{a}^{a+T}f(x)dx$.
Dec 26 '11
23
How did Hermite calculate $e^{\pi\sqrt{163}}$ in 1859?
Jan 24 '12
22
Similar matrices and field extensions
Aug 13 '11
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Single comment split into many comments
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Are there non-scalar endomorphisms of the functor $V\mapsto V^{**}/V$?
53
Quick proofs of hard theorems
38
What is your favorite proof of Tychonoff's Theorem?
25
Is every commutative ring a limit of noetherian rings?
20
Example of an additive functor admitting no right derived functor

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