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Positivity in equivariant Schubert calculus

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arxiv math/9908172 v1 pith:QYPJJFWF submitted 1999-08-31 math.AG math.RT

Positivity in equivariant Schubert calculus

classification math.AG math.RT
keywords equivariantpositivitycohomologygeneralresulttheoremactionscalculus
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We prove a conjecture of Dale Peterson on positivity in the multiplication in the T-equivariant cohomology of the flag variety. The theorem follows from a more general positivity result about the equivariant cohomology of varieties with actions of a solvable group with finitely many orbits. This more general result is an equivariant version of a theorem of Kumar and Nori.

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