Residues, Grothendieck polynomials and K-theoretic Thom polynomials

Monday, 5 November, 2018

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Grothendieck polynomials were introduced by Lascoux and Schützenberger, and they play an important role in K-theoretic Schubert calculus. In this paper, we give a new definition of double stable Grothendieck polynomials based on an iterated residue operation. We illustrate the power of our definition by calculating the Grothendieck expansion of K-theoretic Thom polynomials of A2 singularities. We present the expansion in two versions: one displays its expected stabilization, while the other displays its expected finiteness property.


Richard Rimanyi
Andras Szenes