User grghxy

27 votes

Accepted

Is there a unique commutative group structure on $\mathbb{G}_m$?

answered Apr 20, 2015 at 4:24

12 votes

Frobenius elements in infinite extensions

answered Oct 10, 2015 at 22:33

11 votes

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Representations of complex semi-simple algebraic group "defined over $\mathbf{Z}$"?

answered Jun 22, 2015 at 19:37

10 votes

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Three and a half basic questions on the Weil restriction of scalars

answered Aug 4, 2015 at 14:50

10 votes

Trivialisation of vector bundles on Stein spaces

answered Sep 24, 2015 at 12:49

9 votes

Field of definition of dominant morphisms

answered Jul 19, 2015 at 18:21

9 votes

Accepted

Infinitesimal deformations of the formal group of $\mathbb{G}_m$

answered May 7, 2015 at 4:06

8 votes

Purely inseparable field extensions of degree p

answered Jul 29, 2015 at 20:10

7 votes

Accepted

Algebraic proof without using comparison theorem for étale cohomology

answered Oct 8, 2015 at 14:37

7 votes

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Is every proper regular relative algebraic space curve over a Dedekind domain projective?

answered May 24, 2015 at 12:40

7 votes

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Compact form of symplectic groups defined over the rationals

answered Jun 23, 2015 at 14:38

6 votes

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Algebraic spaces which are automatically schemes

answered Jun 9, 2015 at 16:24

6 votes

Accepted

Lifting torsors in characteristic $p$ to characteristic zero

answered Jul 15, 2015 at 17:55

6 votes

How simple does a $\mathbb{Q}$-simple group remain after base change to $\mathbb{Q}_{\ell}$?

answered Aug 12, 2015 at 16:06

6 votes

Accepted

Deciding whether a non-f.g. non-divisible flat module is projective or not

answered Aug 17, 2015 at 0:35

5 votes

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Transitivity of discriminant for flat algebras

answered Jun 27, 2015 at 22:29

5 votes

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Lie Algebras over DVRs and basechange to the completion

answered Jul 20, 2015 at 16:16

3 votes

Lefschetz Principle for semisimplicity

answered Oct 9, 2015 at 16:23

3 votes

Accepted

Reference requests for complex duals of connected reductive groups

answered Jul 11, 2015 at 3:41

3 votes

Accepted

Is there a complete local analogue of the Artin-Tate lemma?

answered Aug 18, 2015 at 4:41

3 votes

Accepted

Permutable (Lie) subgroups

answered Jul 20, 2015 at 0:13

1 vote

Is any F-stable maximal torus contained in some F-stable Borel subgroup?

answered May 19, 2015 at 14:45

0 votes

Isotropic ternary forms

answered Jun 2, 2015 at 0:33

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23 Answers

Is there a unique commutative group structure on $\mathbb{G}_m$?

Frobenius elements in infinite extensions

Representations of complex semi-simple algebraic group "defined over $\mathbf{Z}$"?

Three and a half basic questions on the Weil restriction of scalars

Trivialisation of vector bundles on Stein spaces

Field of definition of dominant morphisms

Infinitesimal deformations of the formal group of $\mathbb{G}_m$

Purely inseparable field extensions of degree p

Algebraic proof without using comparison theorem for étale cohomology

Is every proper regular relative algebraic space curve over a Dedekind domain projective?

Compact form of symplectic groups defined over the rationals

Algebraic spaces which are automatically schemes

Lifting torsors in characteristic $p$ to characteristic zero

How simple does a $\mathbb{Q}$-simple group remain after base change to $\mathbb{Q}_{\ell}$?

Deciding whether a non-f.g. non-divisible flat module is projective or not

Transitivity of discriminant for flat algebras

Lie Algebras over DVRs and basechange to the completion

Lefschetz Principle for semisimplicity

Reference requests for complex duals of connected reductive groups

Is there a complete local analogue of the Artin-Tate lemma?

Permutable (Lie) subgroups

Is any F-stable maximal torus contained in some F-stable Borel subgroup?

Isotropic ternary forms