Some proofs of independence in axiomatic set theory1 | The Journal of Symbolic Logic | Cambridge Core
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# Some proofs of independence in axiomatic set theory1
Published online by Cambridge University Press: 12 March 2014
Elliott Mendelson
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## Extract
1. Gödel's theorem that sufficiently strong formal systems cannot prove their own consistency and Tarski's method for constructing truth-definitions can be combined to give several independence results in axiomatic set theory. In substance, the following theorems can be obtained: (a) The existence of inaccessible ordinals is not provable from the axioms of set theory, if these axioms are consistent, (b) The axiom of infinity is independent of the other axioms, if these other axioms are consistent, (c) The axiom of replacement is independent of the other axioms, if these other axioms are consisten