Modus ponens
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Alfred Tarski
Mathematics
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Logical positivism
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Liar paradox
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Language
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Karl Popper
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January 14
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John von Neumann
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Finite set
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Friedrich Hayek
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First-order logic
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Euclidean space
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Euclidean geometry
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Logical disjunction
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Cardinality
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Charles Sanders Peirce
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Continuum hypothesis
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Berry paradox
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Boolean algebra (structure)
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Axiom of choice
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Distributive property
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Deductive reasoning
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History of logic
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Free group
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Paul Feyerabend
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Gödel's incompleteness theorems
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Rudolf Carnap
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Axiom of extensionality
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Kenneth Arrow
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Fuzzy logic
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Gottlob Frege
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Saul Kripke
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Philosophy of mathematics
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Kazimierz Kuratowski
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Universal algebra
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Many-valued logic
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1901
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1950s
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Willard Van Orman Quine
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Truth
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Semantics
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Polish notation
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Primitive notion
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Poland
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Model theory
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Mathematical logic
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