Every group representation of a finite group over a field whose characteristic does not divide the number of elements of the group is semisimple. Given an invariant subspace, averaging any projection onto it over the group produces an equivariant projection, whose kernel is an invariant complement.
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- Clebsch-Gordan decomposition of group representations
- Faithful irreducible representation of a finite simple group
- Nonfaithful representations of the infinite dihedral group
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- Representation theory
- Two-subset incidence realization of a two-row Specht module
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