The converse conjecture for F-support containment and row-overlap dominance

From papers

Let AA and BB be skew shapes of the same size. For each positive integer kk, let rowsk(A)\mathrm{rows}_{k}(A) and rowsk(B)\mathrm{rows}_{k}(B) denote their row-overlap partitions, and let suppF(A)\mathrm{supp}_{F}(A) denote the set of descent compositions indexing the fundamental quasisymmetric functions occurring in the expansion associated with AA. Write \preceq for dominance order on partitions. The converse conjecture.

suppF(A)suppF(B)rowsk(A)rowsk(B) for all k.\mathrm{supp}_{F}(A) \supseteq \mathrm{supp}_{F}(B) \quad\Longleftrightarrow\quad \mathrm{rows}_{k}(A) \preceq \mathrm{rows}_{k}(B) \text{ for all } k.

This conjecture gives a characterization of containment of FF-supports by dominance of row-overlap partitions and, equivalently, identifies the relevant FF-support and overlaps posets. It has been computationally checked for all skew shapes of size at most 1212, while the general case remains open.

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Sources & referencesView supporting material

Primary source

Peter R. W. McNamara, “Comparing skew Schur functions: a quasisymmetric perspective”, arXiv:1307.6233 (2014).

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