Automorphisms on the ring of symmetric functions and stable and dual stable Grothendieck polynomials

2018/08/07 by Takigiku, Motoki
#Combinatorics (math.CO) #FOS: Mathematics

paper · doi:10.48550/arxiv.1808.02251

Abstract

The dual stable Grothendieck polynomials g_λ and their sums ∑_μ⊂λ g_μ (which represent K-homology classes of boundary ideal sheaves and structure sheaves of Schubert varieties in the Grassmannians) have the same product structure constants. In this paper we first explain that the ring automorphism g_λ↦∑_μ⊂λ g_μ on the ring of symmetric functions is described as the operator F^⊥, the adjoint of the multiplication (F⋅), by a "group-like" element F=∑_i h_i where h_i is the complete symmetric function. Next we give a generalization: starting with another "group-like" elements ∑_i tⁱ h_i, we obtain a deformation with a parameter t of the ring automorphism above, as well as identities involving stable and dual stable Grothendieck polynomials.

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