User Henri Johnston

11 votes

A finite group $G$ all of whose reps are defined over $\mathbb{Z}$ and yet $Rep(G)$ is not generated by permutation representations

answered Jul 2, 2019 at 9:01

10 votes

Accepted

Number of Galois extensions of local fields of fixed degree

answered Jun 23, 2011 at 17:08

10 votes

Where are mathematics jobs advertised if not on mathjobs (e.g. in Europe and elsewhere)?

answered Aug 27, 2010 at 11:25

8 votes

Accepted

How to distinguish division algebras from matrix algebras?

answered Mar 10, 2011 at 12:42

6 votes

LaTeX tricks that save time in typesetting

answered Mar 23, 2021 at 12:01

6 votes

Introductory reading on the Scholz reflection principle?

answered Sep 10, 2011 at 0:03

5 votes

Accepted

Looking for criterion for $\mathbb{Z}G$-modules to be projective

answered Mar 14, 2012 at 20:47

5 votes

How does the work of a pure mathematician impact society?

answered Jul 19, 2013 at 9:05

5 votes

Taking lecture notes in lectures

answered Oct 23, 2010 at 20:15

5 votes

Reference for behavior of Artin $L$-functions at $\Re(s) = 1$

answered Apr 2, 2021 at 11:24

5 votes

LaTeX tricks that save time in typesetting

answered Mar 23, 2021 at 11:55

3 votes

Accepted

Galois module theory: from global to local

answered Jun 11, 2021 at 10:09

3 votes

References for Hopf Galois module theory

answered Mar 14, 2021 at 12:01

2 votes

Tables of class numbers of cyclotomic fields

answered Dec 31, 2023 at 14:36

2 votes

A catalog of faithful representations of finite groups?

answered Dec 13, 2016 at 14:08

1 vote

Cancellation property for certain integral group rings

answered Jul 12, 2018 at 10:57

1 vote

Accepted

Vanishing of certain $\mu$-invariants attached to abelian extensions of imaginary quadratic fields

answered Nov 15, 2013 at 12:45

1 vote

Iterated semi-direct products

answered Feb 3, 2014 at 18:22

0 votes

How hard is it to find the first layer of this basic $\mathbb{Z}_p$-extension?

answered Mar 13, 2021 at 11:37

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19 Answers

A finite group $G$ all of whose reps are defined over $\mathbb{Z}$ and yet $Rep(G)$ is not generated by permutation representations

Number of Galois extensions of local fields of fixed degree

Where are mathematics jobs advertised if not on mathjobs (e.g. in Europe and elsewhere)?

How to distinguish division algebras from matrix algebras?

LaTeX tricks that save time in typesetting

Introductory reading on the Scholz reflection principle?

Looking for criterion for $\mathbb{Z}G$-modules to be projective

How does the work of a pure mathematician impact society?

Taking lecture notes in lectures

Reference for behavior of Artin $L$-functions at $\Re(s) = 1$

LaTeX tricks that save time in typesetting

Galois module theory: from global to local

References for Hopf Galois module theory

Tables of class numbers of cyclotomic fields

A catalog of faithful representations of finite groups?

Cancellation property for certain integral group rings

Vanishing of certain $\mu$-invariants attached to abelian extensions of imaginary quadratic fields

Iterated semi-direct products

How hard is it to find the first layer of this basic $\mathbb{Z}_p$-extension?