Alex Yong, University of Illinois at Urbana-Champaign – Geometric Methods in Representation Theory Seminar

Title: The A.B.C.D’s of Schubert calculus

Abstract: We collect Atiyah-Bott Combinatorial Dreams (A.B.C.Ds) in Schubert calculus. One result relates equivariant structure coefficients for two isotropic flag manifolds, with consequences to the thesis of C. Monical. We contextualize using work of N. Bergeron-F. Sottile, S. Billey-M. Haiman, P. Pragacz, and T. Ikeda-L. Mihalcea-I. Naruse. The relation complements a theorem of A. Kresch-H. Tamvakis in quantum cohomology. Results of A. Buch-V. Ravikumar rule out a similar correspondence in K-theory. This is joint work with Colleen Robichaux and Harshit Yadav.