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| Authors: | Jie Du Leonard Scott |
| Affiliation: | School of Mathematics, University of New South Wales, Sydney 2052, Australia ; Department of Mathematics, University of Virginia, Charlottesville, Virginia 22903 |
| Abstract: | We study a class of endomomorphism algebras of certain |
| Keywords: | |
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-permutation modules over the Hecke algebra of type 
, whose summands involve both parabolic and quasi-parabolic subgroups, and prove that these algebras are integrally free and quasi-hereditary, and are stable under base change. Some consequences for decomposition numbers are discussed.