New Foundations
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In mathematical logic, New Foundations (NF) is an axiomatic set theory, conceived by Willard Van Orman Quine as a simplification of the theory of types of Principia Mathematica. Quine first proposed NF in a 1937 article titled "New Foundations for Mathematical Logic"; hence the name. Much of this entry discusses NFU, an important variant of NF due to Jensen (1969) and exposited in Holmes (1998).
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See also
- Alternative set theory
- Axiomatic set theory
- Implementation of mathematics in set theory
- Positive set theory
- Set-theoretic definition of natural numbers
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