Class logic
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logic
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Bertrand Russell
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International Standard Book Number
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set theory
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calculus
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Gottlob Frege
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Giuseppe Peano
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Willard Van Orman Quine
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Russell's paradox
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antinomy
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Ernst Zermelo
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first-order logic
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Peano axioms
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formal system
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naive set theory
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class
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Zermelo–Fraenkel set theory
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type theory
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axiom of extensionality
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Cesare Burali-Forti
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