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first-order and higher-order logic, model theory, set theory, proof theory, computability theory, formal languages, definability, interplay of syntax and semantics, constructive logic, intuitionism, philosophical logic, modal logic, completeness, Gödel incompleteness, decidability, undecidability, theories of truth, truth revision, consistency.
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Adjoining an arrow to a CCC
I just started reading Lambek and Scott's book "Introduction to higher-order categorical logic".
Right now I am reading Part I, section 5 (Polynomial categories). They explain two ways of adjoining a …