##
An amazing tetrahedron of equivalences

Jim Bryan, University of British Columbia

Abstract:

We explain how the following four theories are equivalent:

(1) The equivariant quantum cohomology of Hilb^d(C^2), the Hilbert
scheme of degree d points in the plane,

(2) The equivariant orbifold quantum cohomology of Sym^d(C^2), the
(orbifold) dth symmetric product of the plane,

(3) The degree d, all genus, equivariant, relative Gromov-Witten theory
of P^1xC^2, and

(4) The degree d, equivariant, relative Donaldson-Thomas theory of
P^1xC^2.