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The Main Goals
Computational Methods
The 2-Modular Character Table of the Fischer Group Fi23
The Modular Atlas Project
Gerhard Hiss
Lehrstuhl D für Mathematik
RWTH Aachen
Lehrstuhl D für Mathematik
RWTH Aachen
6th Symposium on Algebra and Computation
Tokyo, 15.–18.11.2005
Gerhard Hiss The Modular Atlas Project
The Main Goals Classification of Representations
Computational Methods Character Tables
The 2-Modular Character Table of the Fischer Group Fi23 The Modular Atlas
Representations
Let G be a finite group and F a field.
An F-representation of G of degree d is a homomorphism
X : G → GL( V),
where V is a d-dimensional F-vector space.
Choosing a basis of V, we obtain a matrix representation
G → GLd (F) to compute with.
X is irreducible, if V does not have any proper G-invariant
subspaces.
Gerhard Hiss The Modular Atlas Project
The Main Goals Classification of Representations
Computational Methods Character Tables
The 2-Modular Character Table of the Fischer Group Fi23 The Modular Atlas
Classification
Fact
There are only finitely many irreducible F-representations of G
up to equivalence.
Aims
Classify all irreducible representations for a given group G
and a given field F .
Describe all irreducible representations of all finite simple
groups.
Use a computer for sporadic simple groups.
Gerhard Hi
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