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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
16
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
9
Where are mathematics jobs advertised if not on mathjobs (e.g. in Europe and elsewhere)?
Aug 27, 2010
answer
9
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

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