A simple proof of associativity and commutativity of LR-coefficients (or the hive ring)

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We give a simple bijective proof of associativity and commutativity of the Littlewood-Richardson coefficients or the hive ring. Specifically, we establish existence a polarized polymatroidal discretely concave functions on the tetrahedron with given boundary values at two adjoint faces.
18 pages, 9 figures

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Combinatorics

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http://salesiana.dossiersoluciones.com/handle/123456789/97640

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0409447
 http://arxiv.org/abs/math/0409447

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arXiv