2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147704In 1+1 dimensions, the Wheeler-DeWitt equation cannot be imposed owing to an anomaly in its commutator with the diffeomorphism constraint. A similar obstruction prevents also a semiclassical definition of a WKB local time. (Talk given at the 7th Marcel Grossman Meeting on General Relativity, Stanford, July 28, 1994.)3 pages, UCLA/94/TEP/34 [One sentence in the conclusion and one reference added.]General Relativity and Quantum Cosmologytext