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تويتر \ John Carlos Baez على تويتر: "The usual axioms of set theory include an axiom saying there exists an infinite set. This is called the "axiom of infinity". But what happens
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Zermelo–Fraenkel set theory with the axiom of choice http://en.wikipedia.org/wiki/Zermelo%E2%80%93Fraenkel_set_theory
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functions - Is it provable from Zermelo–Fraenkel Set Theory, that if a countable set of sets exists, then this other countable set of sets exists? - Mathematics Stack Exchange
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The Axioms of Zermelo-Fraenkel Set Theory with Choice ZFC Printables & Template for 10th - Higher Ed | Lesson Planet
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