A formula for K-theory truncation Schubert calculus

Details A formula for K-theory truncation Schubert calculus A formula for K-theory truncation Schubert calculus

2004-07-05

arxiv.org/abs/math/0407051v1

Intern. Math. Res. Notices (70) 2004, 3741-3756

Mathematics

Combinatorics

10 pages

Scientific paper

Define a ``truncation'' $r_{t}(p)$ of a polynomial $p$ in $\{x_1,x_2,x_3,...\}$ as the polynomial with all but the first $t$ variables set to zero. In certain good cases, the truncation of a Schubert or Grothendieck polynomial may again be a Schubert or Grothendieck polynomial. We use this phenomenon to give subtraction-free formulae for certain Schubert structure constants in $K(Flags({\mathbb C}^n))$, in particular generalizing those from [Kogan '00] in which only cohomology was treated, and from [Buch `02] on the Grassmannian case. The terms of the answer are computed using ``marching'' operations on permutation diagrams.

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