Abstract
In [58], Shi proved Lusztig’s conjecture that the number of two-sided cells for the affine Weyl group of type \(A_{n-1}\) is the number of partitions of n. As a byproduct, he introduced the Shi arrangement of hyperplanes and found a few of its remarkable properties. The Shi arrangement has since become a central object in algebraic combinatorics. This article is intended to be a fairly gentle introduction to the Shi arrangement, intended for readers with a modest background in combinatorics, algebra, and Euclidean geometry.
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