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What makes a D_0 graph Schur positive?
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What makes a D_0 graph Schur positive?

Jonah Blasiak
arXiv.org
13 Nov 2014
DOI: https://doi.org/10.48550/arxiv.1411.3624
url
https://doi.org/10.48550/arxiv.1411.3624View
Preprint (Author's original)arXiv.org - Non-exclusive license to distribute,  Open

Abstract

Mathematics - Combinatorics
We define a D_0 graph to be a graph whose vertex set is a subset of permutations of n, with edges of the form ...bac... <--> ...bca... or ...acb... <--> ...cab... (Knuth transformations), or ...bac... <--> ...acb... or ...bca... <--> ...cab... (rotation transformations), such that whenever the Knuth and rotation transformations at positions i-1, i, i+1 are available at a vertex, exactly one of these is an edge. The generating function of such a graph is the sum of the quasisymmetric functions associated to the descent sets of its vertices. Assaf studied D_0 graphs in the paper *Dual equivalence and Schur positivity* and showed that they provide a rich source of examples of the D graphs defined in the paper *Dual equivalence graphs and a combinatorial proof of LLT and Macdonald positivity*. A key construction of Assaf expresses the coefficient of q^t in an LLT polynomial as the generating function of a certain D_0 graph. LLT polynomials are known to be Schur positive by work of Grojnowski-Haiman, and experimentation shows that many D_0 graphs have Schur positive generating functions, which suggests a vast generalization of LLT positivity in this setting. As part of a series of papers, we study D_0 graphs using the Fomin-Greene theory of noncommutative Schur functions. We construct a D_0 graph whose generating function is not Schur positive by solving a linear program related to a certain noncommutative Schur function. We go on to construct a D graph on the same vertex set as this D_0 graph.

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