A Littlewood-richardson Rule for Two-step Flag Varieties

  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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