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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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Notation in 'The lambda calculus, its syntax and semantics' by H.P. Barendregt

I'm reading the book 'The lambda calculus its syntax and semantics'. In part 5, chapter 19: Local structure of Models, more specifically 19.2 Local structure of $D_\infty$, the notation $D_\infty \vDa …
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