An S_3-symmetric Littlewood-Richardson rule

preprint2007arXivOpen access

Abstract

The classical Littlewood-Richardson coefficients C(lambda,mu,nu) carry a natural S3S_3 symmetry via permutation of the indices. Our "carton rule" for computing these numbers transparently and uniformly explains these six symmetries; previously formulated Littlewood-Richardson rules manifest at most three of the six.

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