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# A Littlewood-richardson Rule for Two-step Flag Varieties

@inproceedings{CoskunALR, title={A Littlewood-richardson Rule for Two-step Flag Varieties}, author={Izzet Coskun} }

We establish a positive geometric rule for computing the structure constants of the cohomology of two-step flag varieties with respect to their Schubert basis. As a corollary we obtain a quantum LittlewoodRichardson rule for Grassmannians. These rules have numerous applications to geometry, representation theory and the theory of symmetric functions.

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