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Primitive prime divisor elements in finite classical groups

Published online by Cambridge University Press:  04 August 2010

Cheryl E. Praeger
Affiliation:
Department of Mathematics, University of Western Australia, Nedlands, W. A. 6907, Australia
C. M. Campbell
Affiliation:
University of St Andrews, Scotland
E. F. Robertson
Affiliation:
University of St Andrews, Scotland
N. Ruskuc
Affiliation:
University of St Andrews, Scotland
G. C. Smith
Affiliation:
University of Bath
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Summary

Abstract

This is an essay about a certain family of elements in the general linear group GL(d, q) called primitive prime divisor elements, or ppd-elements. A classification of the subgroups of GL(d, q) which contain such elements is discussed, and the proportions of ppd-elements in GL(d, q) and the various classical groups are given. This study of ppd-elements was motivated by their importance for the design and analysis of algorithms for computing with matrix groups over finite fields. An algorithm for recognising classical matrix groups, in which ppd-elements play a central role is described.

Introduction

The central theme of this essay is the study of a special kind of element of the general linear group GL(d, q) of nonsingular d × d matrices over a finite field GF (q) of order q. We define these elements, which we call primitive prime divisor elements or ppd-elements, and give good estimates of the frequencies with which they occur in GL(d, q) and the various classical matrix groups. Further we describe a classification of the subgroups of GL(d, q) which contain ppd-elements, and explore their role in the design and analysis of a randomised algorithm for recognising the classical matrix groups computationally.

Perhaps the best way to introduce these ideas, and to explain the reasons for investigating this particular set of research questions, may be to give a preliminary discussion of a generic recognition algorithm for matrix groups.

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Publisher: Cambridge University Press
Print publication year: 1999

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