2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/138552We construct non-isomorphic models M, N, e.g. of cardinality aleph_1 such that in the Ehrenfeucht-Fraisse game of length zeta < omega_1 the isomorphism player winsLogicEF equivalent not isomorphic modelstext