Izzet Coskun

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We describe recent work on positive descriptions of the structure constants of the coho-mology of homogeneous spaces such as the Grassmannian, by degenerations and related methods. We give various extensions of these rules, some new and conjectural, to K-theory, equivariant cohomology, equivariant K-theory, and quantum cohomology. The equivariant cohomology(More)
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