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Henri Johnston's user avatar
Henri Johnston's user avatar
Henri Johnston's user avatar
Henri Johnston
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I am senior lecturer in pure mathematics at the University of Exeter. My research interests are in algebraic number theory.

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question
17
For which finite groups $G$ is every character a virtual permutation character?
Jul 28, 2016
question
15
Search for $A_4$-extension of $\mathbb{Q}$ with particular ramification properties
Feb 28, 2017
question
11
Iterated semi-direct products
Jan 30, 2014
answer
11
A finite group $G$ all of whose reps are defined over $\mathbb{Z}$ and yet $Rep(G)$ is not generated by permutation representations
Jul 2, 2019
answer
10
Where are mathematics jobs advertised if not on mathjobs (e.g. in Europe and elsewhere)?
Aug 27, 2010
answer
10
Number of Galois extensions of local fields of fixed degree
Jun 23, 2011
question
8
Representation theory of a finite p-group over a field of characteristic p: dim of invariants =1 => dim of coinvariants = 1?
May 4, 2012
question
8
For which finite groups $G$ does the Wedderburn decomposition of $\mathbb{Q}[G]$ consist only of fields and division algebras?
Jul 28, 2016
answer
8
How to distinguish division algebras from matrix algebras?
Mar 10, 2011
question
7
Modular representation theory: central idempotents in $\mathbb{Z}_p[G]$
Aug 8, 2012