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Automorphism Orbits and Element Orders in Finite Groups

Automorphism Orbits and Element Orders in Finite Groups Almost-Solubility and the Monster - Memoirs of the American Mathematical Society

Paperback (31 Jul 2023)

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Publisher's Synopsis

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.

Book information

ISBN: 9781470465445
Publisher: American Mathematical Society
Imprint: American Mathematical Society
Pub date:
DEWEY: 512.23
DEWEY edition: 23/eng/20231002
Language: English
Number of pages: 95
Weight: -1g
Height: 254mm
Width: 178mm