J. Aust. Math. Soc.  80 (2006), 45-63
Seminormal and subnormal subgroup lattices for transitive permutation groups

Cheryl E. Praeger
  School of Mathematics and Statistics
  The University of Western Australia
  35 Stirling Highway
  Crawley WA 6009

Various lattices of subgroups of a finite transitive permutation group G can be used to define a set of `basic' permutation groups associated with G that are analogues of composition factors for abstract finite groups. In particular, G can be embedded in an iterated wreath product of a chain of its associated basic permutation groups. The basic permutation groups corresponding to the lattice $\mathcal{L}$ of all subgroups of G containing a given point stabiliser are a set of primitive permutation groups. We introduce two new subgroup lattices contained in $\mathcal{L}$, called the seminormal subgroup lattice and the subnormal subgroup lattice. For these lattices the basic permutation groups are quasiprimitive and innately transitive groups, respectively.
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