2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34364The Multiverse is collection of parallel universes. In this article a formal theory and a topos-theoretic models of the multiverse are given. For this the Lawvere-Kock Synthetic Differential Geometry and topos models for smooth infinitesimal analysis are used. Physical properties of multi-variant and many-dimensional parallel universes are discussed. The source of multiplicity of physical objects is set of physical constants.10 pages, LaTeX, report on 11-th International (Russian) Gravitational Conference at Tomsk. July 1-7, 2002General Relativity and Quantum Cosmologytext