2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/208483We present a topos-theoretic interpretation of (a categorical generalization of) Fraisse's construction in model theory, with applications to countably categorical theories.17 pages; new version with generalized theoremsCategory TheoryLogic03G30; 03C35; 18C10; 18B25Fraisse's construction from a topos-theoretic perspectivetext