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Let U=Un(q) be the group of lower unitriangular n×n-matrices with entries in the field Fq with q elements for some prime power q and n∈N. We investigate the restriction to U of the permutation action of GLn(q) on flags in the natural GLn(q)-module Fqn. Applying our results to the special case of flags of length two we obtain a complete decomposition of the permutation representation of GLn(q) on the...
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