Supersymmetric Schur polynomials have saturated Newton polytopes

Abstract

We prove that every supersymmetric Schur polynomial has a saturated Newton polytope (SNP). Our approach begins with a tableau-theoretic description of the suport, which we encode as a polyhedron with a totally unimodular constraint matrix. The integrality of this polyhedron follows from the Hoffman-Kruskal criterion, thereby establishing the SNP property. To our knowledge, this is the first application of total unimodularity to the SNP problem.

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