2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77149We construct a ring structure on complex cobordism tensored with the rationals, which is related to the usual ring structure as quantum cohomology is related to ordinary cohomology. The resulting object defines a generalized two- dimensional topological field theory taking values in a category of spectra.16 pages. See also http://hopf.math.purdue.edu/Quantum AlgebraAlgebraic Geometry14H10 (primary), 55N35, 81R10 (secondary)text