Abstract
In this paper we define the relation ≺ t of elementary extension of topological models in the language L t and show a Back and Forth criterion for ≺ t . We introduce some new operations on partial homeomorphisms preserving Back and Forth properties. Some properties of ≺ t are proved by the Back and Forth technique.
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Majewski, M. Elementary extensions of topological models in L t language. Stud Logica 46, 255–264 (1987). https://doi.org/10.1007/BF00372550
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DOI: https://doi.org/10.1007/BF00372550