Abstract

Several constructions of Laplace operators for the canonical realization of the orthogonal Lie algebra are discussed. All of them are related with the Capelli-type determinant of a matrix formed by the generators of this Lie algebra. Combinatorial properties of the projection map S N → S N − 1 used in the definition of the Capelli-type determinant are studied. It is proved that the fibers of this projection form a partition of the Bruhat order on S N into Boolean intervals such that the number of intervals with 2 k elements is the Stirling number of the first kind c( N − 1, k).

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