An explicit construction of the McKay correspondence for A-Hilb [formula omitted

Abstract

For a finite Abelian subgroup A ⊂ SL ( 3 , C ) , let Y = A -Hilb ( C 3 ) denote the scheme parametrising A-clusters in C 3 . Ito and Nakajima proved that the tautological line bundles (indexed by the irreducible representations of A) form a basis of the K-theory of Y. We establish the relations between these bundles in the Picard group of Y and hence, following a recipe introduced by Reid, construct an explicit basis of the integral cohomology of Y in one-to-one correspondence with the irreducible representations of A.