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Results tagged with lo.logic
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user 53140
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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Valid statement in submodel? (Consistency lemma in Cohen's CH book)
In Paul Cohen's
Set Theory and the Continuum Hypothesis
(Page 71) there is a lemma with the assumption that
$\exists x\, P(x)$.
The ''proof'' there, uses the following argument:
Intuitively the …
- 137