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Quine's New Foundations

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[Revised entry by Thomas Forster on May 22, 2018. Changes to: Main text] Quine's system of axiomatic set theory, NF, takes its name from the title ("New Foundations for Mathematical Logic") of the 1937 article which introduced it (Quine [1937a]). The axioms of NF are extensionality: [ forall xforall y[x=y leftrightarrow forall z(z in x leftrightarrow z in y)]...

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News source: Stanford Encyclopedia of Philosophy

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