Counting chains in the noncrossing partition lattice via the W-Laplacian
Journal of Algebra(2022)
摘要
We give an elementary, case-free, Coxeter-theoretic derivation of the formula hnn!/|W| for the number of maximal chains in the noncrossing partition lattice NC(W) of a real reflection group W. Our proof proceeds by comparing the Deligne-Reading recursion with a parabolic recursion for the characteristic polynomial of the W-Laplacian matrix considered in our previous work. We further discuss the consequences of this formula for the geometric group theory of spherical and affine Artin groups.
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关键词
Noncrossing partitions,Coxeter elements,W-Laplacian,Artin groups,Coxeter-Catalan combinatorics,Dual braid presentation
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