2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/60595To any graded Frobenius algebra A we associate a sequence of graded Frobenius algebras A^[n] in such a way that for any smooth projective surface X with trivial canonical divisor there is a canonical isomorphism of rings between (H*X)^[n] and the cohomology H*(X^[n]) of the n-th Hilbert scheme of X.22 pagesAlgebraic Geometry14C05,14C1520B30;17B68,17B69,20C05text