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The Indecomposables of Rank 3 Permutation Modules


Lewy, Michael Robert (1985) The Indecomposables of Rank 3 Permutation Modules. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/6h5n-b393.


Transitive permutation groups of finite order are viewed as linear groups over fields of characteristic p > 0 by having the group permute the basis elemerits of a vector space M. The decomposition of M into the direct sum of invariant subspaces is investigated, and criteria given for whether M is decomposable, and if it is, how many direct summands occur, in the special case the group has rank 3, i.e., it has 3 orbits on ordered pairs of points. In the case that each orbit is self-paired, M decomposes into the maximum possible number of indecomposables, and the group has every p'-element conjugate to its inverse, irreducibility results are obtained for the indecomposables. This last result holds for any rank. It applies in particular to the symmetric and thence to the alternating groups, which enables us to describe certain modular irreducibles of these groups.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Mathematics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Mathematics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Wales, David B.
Thesis Committee:
  • Wales, David B. (chair)
  • Apostol, Tom M.
  • Aschbacher, Michael
  • Wilson, Richard M.
Defense Date:22 May 1985
Funding AgencyGrant Number
Record Number:CaltechTHESIS:01222019-125147510
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11351
Deposited By: Mel Ray
Deposited On:28 Jan 2019 20:45
Last Modified:19 Apr 2021 22:37

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