Plural quantification
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George Boolos
Set-theoretic definition of natural numbers
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List of logicians
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Diagonal lemma
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Second-order logic
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Hume's principle
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Supertask
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Crispin Wright
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Knights and Knaves
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Hilary Putnam
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Gottlob Frege
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Roger Penrose
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Liar paradox
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First-order logic
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Empty set
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Berry paradox
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