2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34790We present an approach to quantum gravity based on the general boundary formulation of quantum mechanics, path integral quantization, spin foam models and renormalization.9 pages, LaTeX + AMS + XYpic, contribution to proceedings of ICP2004, Tehran, Iran, January 2004General Relativity and Quantum CosmologyHigh Energy Physics - Theorytext