School of Mathematical Sciences

The Suzuki groups menu

The Suzuki groups

Speaker: 
Rob Wilson
Date/Time: 
Mon, 12/10/2009 - 17:30
Room: 
M103
Seminar series: 

The Suzuki groups form one of the 17 families of non-abelian finite simple groups. They can be defined in various ways as groups of 4 × 4 matrices over finite fields of order q = 22n+1 , for n > 0.

The best description of a group is usually as the automorphism group of some object. Most descriptions of the Suzuki groups involve a geometrical object called an ovoid, which consists of q2 + 1 subspaces of dimension 1 in a 4-dimensional space, with the property that any three of them span a 3-dimensional subspace. However, constructing these ovoids usually involves some kind of `magic' (such as pulling them out of a hat, like rabbits).

In this talk I shall describe a new family of algebraic objects, whose automorphism groups are the Suzuki groups, and which give rise to the Suzuki ovoids in a natural manner. Thus we obtain a new and elementary definition (and description) of the Suzuki groups. Very little actual group theory is involved, just a little linear algebra.