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Two Theorems on Doubly Transitive Permutation Groups
Author(s) -
Atkinson M. D.
Publication year - 1973
Publication title -
journal of the london mathematical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.441
H-Index - 62
eISSN - 1469-7750
pISSN - 0024-6107
DOI - 10.1112/jlms/s2-6.2.269
Subject(s) - transitive relation , citation , permutation (music) , permutation group , computer science , combinatorics , mathematics , library science , physics , acoustics
M. D. ATKINSONIn a series of papers [3, 4 and 5] on insoluble (transitive) permutation groupsof degree p = 2q +1, where p and q are primes, N. Ito has shown that, apart from asmall number of exceptions, such a group must be at least quadruply transitive.One of the results which he uses is that an insoluble 2q grou +1 p of degree p =which is not doubly primitive must be isomorphi (3, 2)c wit to PSh p =L 7. Thisresult is due to H. Wielandt, and ltd gives a proof in [3]. It is quite easy to extendthis proof to give the following result: a doubly transitive group of degree 2q + l,where q is prime, which is not doubly primitive, is either sharply doubly transitiveor a group of automorphisms of a bloc A = 1 ank desigd k = 3n wit. Ouh rnotation for the parameters of a block design, v, b, X, k, i r,s standard; see [9].In this paper we shall prove two results about doubly transitive but not doublyprimitive groups which resemble the two results mentioned above.