User Dmitry Vaintrob

22 votes

Why is the Fourier transform so ubiquitous?

answered Feb 12, 2020 at 21:12

21 votes

Does the category of (algebraically closed) fields of characteristic $p$ change when $p$ changes?

answered Apr 8, 2016 at 0:54

20 votes

Algebraic machinery for algebraic geometry

answered Apr 16, 2013 at 7:17

13 votes

What is modern algebraic topology(homotopy theory) about?

answered Jan 19, 2016 at 21:25

13 votes

Accepted

Can we use formal groups to recover Lie-theoretic representation theory in characteristic p?

answered Apr 14, 2022 at 9:09

12 votes

When forgetting structure doesn't matter

answered Apr 30, 2022 at 8:44

12 votes

Situations where “naturally occurring” mathematical objects behave very differently from “typical” ones

answered Jul 26, 2021 at 19:53

12 votes

Is forming the Albanese variety a monad?

answered Aug 9, 2016 at 18:49

11 votes

Accepted

Rational Isogenies of Prime Degree

answered Oct 16, 2010 at 17:19

8 votes

Number of points of algebraic curve

answered Aug 20, 2021 at 7:01

8 votes

Accepted

$ \mathbb{R}P^n $ bundles over the circle

answered Jan 23, 2022 at 13:41

6 votes

Analytic continuation of the double sum $\sum_{n,m\ge0}x^ny^mt^{nm}$

answered Feb 3, 2016 at 22:54

6 votes

Which is the correct universal enveloping algebra in positive characteristic?

answered Feb 26, 2020 at 21:48

5 votes

Accepted

Tangent space of a finite flat group scheme

answered Jul 25, 2019 at 22:02

5 votes

Galois twist of a variety

answered Nov 5, 2017 at 19:21

5 votes

Free augmented algebras

answered Feb 14, 2020 at 20:20

5 votes

Accepted

Dimension of $\ell$-adic Eilenberg-Maclane space

answered Feb 21, 2020 at 0:46

5 votes

What kind of geometric object is the Pauli spin matrix vector $\vec{\sigma} = (\sigma_1, \sigma_2, \sigma_3)$?

answered Jan 26, 2016 at 23:25

5 votes

Accepted

Description of the units of the group ring Fp[Fp] ?

answered Apr 12, 2013 at 4:32

4 votes

Accepted

Is there a nonzero sheaf with all cohomologies vanish?

answered Apr 27, 2015 at 14:37

4 votes

Accepted

Question about local description of the branch locus

answered Feb 5, 2013 at 0:16

4 votes

On a theorem of Kazhdan

answered Mar 24, 2015 at 21:16

4 votes

Accepted

Derived category of singular varieties

answered Feb 25, 2020 at 3:13

4 votes

Accepted

Formal completion of an elliptic curve along the $0$ sectioin and the formal expansion of functions

answered Jul 22, 2019 at 23:01

4 votes

About Lie group $G$ has this escape property？

answered Aug 20, 2021 at 6:32

4 votes

Super mixed Hodge structures?

answered Dec 13, 2021 at 7:26

3 votes

Accepted

Perfect DG modules

answered Sep 14, 2019 at 3:02

3 votes

Nowhere vanishing section implies reduction of structure group

answered Sep 15, 2019 at 1:48

3 votes

Cotangent complex of certain dg-scheme

answered Apr 22, 2016 at 21:48

2 votes

How much of a variety can be reconstructed from codimension-zero data?

answered Mar 24, 2013 at 14:46

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43 Answers

Why is the Fourier transform so ubiquitous?

Does the category of (algebraically closed) fields of characteristic $p$ change when $p$ changes?

Algebraic machinery for algebraic geometry

What is modern algebraic topology(homotopy theory) about?

Can we use formal groups to recover Lie-theoretic representation theory in characteristic p?

When forgetting structure doesn't matter

Situations where “naturally occurring” mathematical objects behave very differently from “typical” ones

Is forming the Albanese variety a monad?

Rational Isogenies of Prime Degree

Number of points of algebraic curve

$ \mathbb{R}P^n $ bundles over the circle

Analytic continuation of the double sum $\sum_{n,m\ge0}x^ny^mt^{nm}$

Which is the correct universal enveloping algebra in positive characteristic?

Tangent space of a finite flat group scheme

Galois twist of a variety

Free augmented algebras

Dimension of $\ell$-adic Eilenberg-Maclane space

What kind of geometric object is the Pauli spin matrix vector $\vec{\sigma} = (\sigma_1, \sigma_2, \sigma_3)$?

Description of the units of the group ring Fp[Fp] ?

Is there a nonzero sheaf with all cohomologies vanish?

Question about local description of the branch locus

On a theorem of Kazhdan

Derived category of singular varieties

Formal completion of an elliptic curve along the $0$ sectioin and the formal expansion of functions

About Lie group $G$ has this escape property？

Super mixed Hodge structures?

Perfect DG modules

Nowhere vanishing section implies reduction of structure group

Cotangent complex of certain dg-scheme

How much of a variety can be reconstructed from codimension-zero data?