Automorphism Orbits and Element Orders in Finite Groups

Name: Automorphism Orbits and Element Orders in Finite Groups
Brand: AMERICAN MATHEMATICAL SOCIETY
Price: 187.75 AUD
Availability: BackOrder

Almost-Solubility and the Monster

By: Alexander Bors, Michael Giudici, Cheryl E. Praeger

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Paperback | 29 October 2023

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95 Pages

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25.4 x 17.8

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For a finite group G, we denote by ?(G) the number of Aut(G)-orbits on G, and by o(G) the number of distinct element orders in G. In this paper, we are primarily concerned with the two quantities d(G) := ?(G) ? o(G) and q(G) := ?(G)/ o(G), each of which may be viewed as a measure for how far G is from being an AT-group in the sense of Zhang (that is, a group with ?(G) = o(G)). We show that the index |G : Rad(G)| of the soluble radical Rad(G) of G can be bounded from above both by a function in d(G) and by a function in q(G) and o(Rad(G)). We also obtain a curious quantitative characterisation of the Fischer-Griess Monster group M.

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