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Quasipolynomial formulas for the Kronecker coefficients indexed by two two―row shapes (extended abstract)

Abstract : We show that the Kronecker coefficients indexed by two two―row shapes are given by quadratic quasipolynomial formulas whose domains are the maximal cells of a fan. Simple calculations provide explicitly the quasipolynomial formulas and a description of the associated fan. These new formulas are obtained from analogous formulas for the corresponding reduced Kronecker coefficients and a formula recovering the Kronecker coefficients from the reduced Kronecker coefficients. As an application, we characterize all the Kronecker coefficients indexed by two two-row shapes that are equal to zero. This allowed us to disprove a conjecture of Mulmuley about the behavior of the stretching functions attached to the Kronecker coefficients.
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Emmanuel Briand, Rosa Orellana, Mercedes Rosas. Quasipolynomial formulas for the Kronecker coefficients indexed by two two―row shapes (extended abstract). 21st International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2009), 2009, Hagenberg, Austria. pp.241-252, ⟨10.46298/dmtcs.2735⟩. ⟨hal-01185427⟩

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