On Elementary Equivalence for Equality-free Logic

Notre Dame Journal of Formal Logic 37 (3):506-522 (1996)
This paper is a contribution to the study of equality-free logic, that is, first-order logic without equality. We mainly devote ourselves to the study of algebraic characterizations of its relation of elementary equivalence by providing some Keisler-Shelah type ultrapower theorems and an Ehrenfeucht-Fraïssé type theorem. We also give characterizations of elementary classes in equality-free logic. As a by-product we characterize the sentences that are logically equivalent to an equality-free one
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DOI 10.1305/ndjfl/1039886524
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