Representations admitting two pairs of supplementary invariant spaces
Résumé
We examine the lattice generated by two pairs of supplementary subvectorspaces of a finite-dimensional vectorspace by intersection and sum, with the aim of applying the results to the study of representations admitting two pairs of supplementary invariant spaces, or one pair and a reflexive form. We show that such a representation is a direct sum of three canonical subrepresentations which we characterize. We then focus on holonomy representations with the same property.
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