2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147719The machinery is suggested to describe the varying spacetime topology on the level of its substitutes by finite topological spaces.49 Kb, latex, paper presented to the Procs. of the Int'l Conf. on Math. Methods in Sci. and Technol., Vienna, June 3 - 6, 1995General Relativity and Quantum Cosmologytext