The Poset of [kappa]-shapes and Branching Rules for [kappa]-Schur Functions

The Poset of [kappa]-shapes and Branching Rules for [kappa]-Schur Functions
Author :
Publisher :
Total Pages : 101
Release :
ISBN-10 : 0821898744
ISBN-13 : 9780821898741
Rating : 4/5 (741 Downloads)

Book Synopsis The Poset of [kappa]-shapes and Branching Rules for [kappa]-Schur Functions by : Thomas Lam

Download or read book The Poset of [kappa]-shapes and Branching Rules for [kappa]-Schur Functions written by Thomas Lam and published by . This book was released on 2013 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: We give a combinatorial expansion of a Schubert homology class in the affine Grassmannian GrSLk into Schubert homology classes in GrSLk+1. This is achieved by studying the combinatorics of a new class of partitions called k-shapes, which interpolates between k k-cores and kk+1-cores. We define a symmetric function for each k-shape, and show that they expand positively in terms of dual k-Schur functions. We obtain an explicit combinatorial description of the expansion of an ungraded k k-Schur function into k+1-Schur functions. As a corollary, we give a formula for the Schur expansion of an ungraded k-Schur function.


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