Mathematics – Combinatorics
Scientific paper
2009-06-25
Mathematics
Combinatorics
Version to appear in Trans. Amer. Math. Soc
Scientific paper
For finite reflection groups of types A and B, we determine the diameter of
the graph whose vertices are reduced words for the longest element and whose
edges are braid relations. This is deduced from a more general theorem that
applies to supersolvable hyperplane arrangements.
Reiner Victor
Roichman Yuval
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