2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/199184Hawking proposed that the cosmological constant is probably zero in quantum cosmology. Duff claimed that Hawking's proof is invalidated. Using the right configuration for the wave function of the universe, we provide a complete proof.6 pages, modified versionGeneral Relativity and Quantum CosmologyAstrophysicsHigh Energy Physics - Theorytext