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Results tagged with lo.logic
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user 9898
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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Condensation for L[U]
Does anyone know where I can find a proof for the Condensation Lemma for the L[U] hierarchy in Set Theory?
Thanks a lot.
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