- direct subformula
- мат.непосредственная подформула
English-Russian scientific dictionary. 2008.
English-Russian scientific dictionary. 2008.
New Foundations — 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 … Wikipedia
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