Existence theorem
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Axiom of infinity
Ernst Zermelo
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Zermelo–Fraenkel set theory
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Infinite set
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Axiom of empty set
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Axiom of pairing
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Axiom schema of replacement
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Actual and potential infinity
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Peano axioms
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Principia Mathematica
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Paul Cohen
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Ordered pair
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Naive Set Theory (book)
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Natural number
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Mathematical induction
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Empty set
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Axiom of regularity
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