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Results tagged with model-theory
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user 115247
Model theory is the branch of mathematical logic which deals with the connection between a formal language and its interpretations, or models.
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Definability of ordinals in various signatures
Recently, I've been studying what the definable subsets of the countable ordinals "look like" from the perspective of bare-bones first order logic (not set theory) equipped with various ways to "acces …
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