Proper Classes
نویسنده
چکیده
A formula (x) in the one non-logical symbol " with one free variable x is Russell if the sentence :9r8x(x"r $ (x)) is logically valid. This note describes a pattern common to the classical examples of Russell formulas, adds a couple of new ones, and constructs many formulas that are near-Russell.
منابع مشابه
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