Mathematics – Combinatorics
Scientific paper
2004-05-28
American Journal of Mathematics, 128, No. 4, (2006), 805--848.
Mathematics
Combinatorics
35 pages. Revised from the original
Scientific paper
We give new formulas for Grothendieck polynomials of two types. One type expresses any specialization of a Grothendieck polynomial in at least two sets of variables as a linear combination of products Grothendieck polynomials in each set of variables, with coefficients Schubert structure constants for Grothendieck polynomials. The other type is in terms of chains in the Bruhat order. We compare this second type to other constructions of Grothendieck polynomials within the more general context of double Grothendieck polynomials and the closely related H-polynomials. Our methods are based upon the geometry of permutation patterns.
Lenart Cristian
Robinson Shawn
Sottile Frank
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