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math.AG2001
Orbifold cohomology for global quotients
Barbara Fantechi, Lothar Goettsche
For an orbifold X which is the quotient of a manifold Y by a finite group G we construct a noncommutative ring with an action of G such that the orbifold cohomology of X as defined…
math.AG2000
On the motive of the Hilbert scheme of points on a surface
Lothar Goettsche
We determine the class of the Hilbert scheme of points on a surface in the Grothendieck group of varieties. As a corollary we obtain its class in the Grothendieck group of motives.…