Impredicativity
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Jean van Heijenoort
Propositional formula
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On Formally Undecidable Propositions of Principia Mathematica and Related Systems
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Skolem's paradox
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Law of thought
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Wolfgang Paalen
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Leopold Löwenheim
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Jock Haston
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Abraham Fraenkel
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Thoralf Skolem
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Emil Leon Post
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Solomon Feferman
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Ernst Zermelo
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L. E. J. Brouwer
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Jacques Herbrand
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List of historians
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Jules Richard (mathematician)
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Andrey Kolmogorov
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Fourth International
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Wilhelm Ackermann
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Gödel's incompleteness theorems
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Axiom of union
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Gottlob Frege
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Primitive recursive function
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Primitive notion
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Intuitionism
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Leon Trotsky
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Law of excluded middle
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Kurt Gödel
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Giuseppe Peano
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Naive set theory
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Axiom of choice
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