p-constrained group

In mathematics, a p-constrained group is a finite group resembling the centralizer of an element of prime order p in a group of Lie type over a finite field of characteristic p. They were introduced by Gorenstein and Walter (1964,p.169) in order to extend some of Thompson's results about odd groups to groups with dihedral Sylow 2-subgroups.

Definition

If a group has trivial p core Op(G), then it is defined to be p-constrained if the p-core Op(G) contains its centralizer, or in other words if its generalized Fitting subgroup is a p-group. More generally, if Op(G) is non-trivial, then G is called p-constrained if G/ Op(G) is p-constrained.

All p-solvable groups are p-constrained.

See also

References

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