Positivity in the Cohomology of Flag Bundles


Graham deduces this from a more general result about varieties with finitely many unipotent orbits, which is proved using induction and a calculation in the rank-one case. The goal of this note is to give a short, geometric proof of Graham’s positivity theorem, based on a transversality argument. Here I only discuss type A, but other types work as well… (More)


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