User Matthieu Romagny

56 votes

14 answers

20k views

Fantastic properties of Z/2Z

asked Nov 14, 2013 at 22:04

22 votes

6 answers

2k views

What is the standard 2-generating set of the symmetric group good for?

asked Oct 1, 2021 at 15:04

19 votes

1 answer

2k views

Polynomials for addition in the Witt vectors

asked Mar 31, 2012 at 13:28

16 votes

1 answer

1k views

Who wrote `if only I could understand the equation $d^2=0$'?

asked Aug 29, 2023 at 20:00

15 votes

1 answer

2k views

Why does finitely presented imply quasi-separated ?

asked Aug 26, 2010 at 9:17

13 votes

1 answer

597 views

Les deux théorèmes d'existence en théorie formelle des modules

asked May 15, 2012 at 20:17

13 votes

3 answers

994 views

Descent of functions along finite birational morphisms

asked Jun 21, 2014 at 13:15

12 votes

3 answers

597 views

Example of a form linear in infinitely many variables ?

asked Aug 30, 2012 at 12:01

11 votes

2 answers

550 views

Book on the tetrahedron

asked Jun 17, 2015 at 21:36

9 votes

1 answer

1k views

Potentially good, semi-stable reduction => good reduction ?

asked Jun 15, 2013 at 20:45

8 votes

1 answer

445 views

Looking for 1986 book "Algebraic and topological theories"

asked Nov 16, 2021 at 17:17

8 votes

2 answers

610 views

Looking for a simple one-dimensional noetherian domain whose regular locus is not open

asked Sep 2, 2019 at 14:03

8 votes

0 answers

253 views

Global functions on a product of schemes over artinian ring

asked Jan 21, 2020 at 8:27

8 votes

0 answers

103 views

Reference for limits of schemes with non-affine transitions?

asked May 11, 2020 at 9:53

7 votes

2 answers

1k views

Algebraic $p$-adic integers mod $p$

asked Apr 5, 2013 at 9:06

7 votes

3 answers

859 views

Is this formally étale morphism of schemes an isomorphism?

asked Nov 2, 2014 at 22:57

6 votes

0 answers

209 views

Functorial criterion for local complete intersection morphisms?

asked Sep 7, 2022 at 9:01

5 votes

0 answers

262 views

Reference for Grothendieck's theorem on representation of unramified functors

asked Sep 20, 2020 at 14:51

5 votes

1 answer

316 views

In a noetherian commutative ring with only one associated prime, is the nilradical locally free?

asked Oct 7, 2015 at 20:15

4 votes

2 answers

432 views

A question on the existence of the quotient of the Hilbert scheme of tricanonical curves

asked Dec 1, 2013 at 21:43

4 votes

2 answers

5k views

A formula for a generator of the multiplicative group of $\mathbb{F}_p$ ?

asked Feb 19, 2013 at 11:01

4 votes

0 answers

174 views

If the Frobenius endomorphism of a characteristic $p$ ring is epimorphic, is it surjective?

asked Jul 31, 2021 at 20:20

3 votes

1 answer

182 views

Flatness over regular local rings of dimension 3

asked Mar 20, 2023 at 16:03

3 votes

0 answers

301 views

Is $\mathcal{O}(1)$ canonical only up to something ?

asked Sep 25, 2010 at 7:57

3 votes

1 answer

223 views

Simplification problem for finite groups

asked Dec 7, 2013 at 13:05

3 votes

1 answer

309 views

Idempotent fractional ideals of a Noetherian domain

asked Apr 19, 2014 at 9:23

2 votes

0 answers

163 views

Properties of rings of global functions of open subschemes

asked May 24, 2019 at 17:04

1 vote

0 answers

257 views

Looking for paper "The cyclotomic identity" by Metropolis and Rota

asked Nov 2, 2010 at 10:19

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28 Questions

Fantastic properties of Z/2Z

What is the standard 2-generating set of the symmetric group good for?

Polynomials for addition in the Witt vectors

Who wrote `if only I could understand the equation $d^2=0$'?

Why does finitely presented imply quasi-separated ?

Les deux théorèmes d'existence en théorie formelle des modules

Descent of functions along finite birational morphisms

Example of a form linear in infinitely many variables ?

Book on the tetrahedron

Potentially good, semi-stable reduction => good reduction ?

Looking for 1986 book "Algebraic and topological theories"

Looking for a simple one-dimensional noetherian domain whose regular locus is not open

Global functions on a product of schemes over artinian ring

Reference for limits of schemes with non-affine transitions?

Algebraic $p$-adic integers mod $p$

Is this formally étale morphism of schemes an isomorphism?

Functorial criterion for local complete intersection morphisms?

Reference for Grothendieck's theorem on representation of unramified functors

In a noetherian commutative ring with only one associated prime, is the nilradical locally free?

A question on the existence of the quotient of the Hilbert scheme of tricanonical curves

A formula for a generator of the multiplicative group of $\mathbb{F}_p$ ?

If the Frobenius endomorphism of a characteristic $p$ ring is epimorphic, is it surjective?

Flatness over regular local rings of dimension 3

Is $\mathcal{O}(1)$ canonical only up to something ?

Simplification problem for finite groups

Idempotent fractional ideals of a Noetherian domain

Properties of rings of global functions of open subschemes

Looking for paper "The cyclotomic identity" by Metropolis and Rota