2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/33919The spectrum of the area operator for a Schwarzschild black hole in loop quantum gravity is fixed by the demand that the entropy of a black hole is maximum. This paper has been withdrawn by the author, due a crucial error in the derivation.5 pages, LaTeX; revised versionGeneral Relativity and Quantum CosmologyHigh Energy Physics - Theorytext