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A combinatorial study on K-theoretic k-Schur functions and stable Grothendieck polynomials

滝聞, 太基 東京大学 DOI:10.15083/0002003725

2022.04.20

概要

This thesis consists of four chapters. In Chapter 1 and 2 we study a family of symmetric functions {g (k) } called K-theoretic k-Schur functions (or K-k-Schur functions for short), which is a K-theoretic and ane deformation of another family of symmetric functions called Schur functions. Although the K-k-Schur functions were introduced in the context of the geometry of ane Grassmannians, our focus is their combinatorial treatment and the proofs of the results are based on purely combinatorial arguments related to some fine structures on the ane symmetric groups.

In Chapter 3 and 4 of the thesis we return to the non-ane case; the dual stable Grothendieck polynomials g are a K-theoretic deformation of Schur functions and can be considered as a certain limit of K-k-Schur functions. We give some properties of these functions that are absent in the ane case, related to the Hopf algebra structure of the ring of symmetric functions.

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