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Results tagged with set-theory
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user 53140
forcing, large cardinals, descriptive set theory, infinite combinatorics, cardinal characteristics, forcing axioms, ultrapowers, measures, reflection, pcf theory, models of set theory, axioms of set theory, independence, axiom of choice, continuum hypothesis, determinacy, Borel equivalence relations, Boolean-valued models, embeddings, orders, relations, transfinite recursion, set theory as a foundation of mathematics, the philosophy of set theory.
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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