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Relations and Functions

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Zermelo-Fraenkel Set Theory

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7. Set Theory. Order Pairs in set theory

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(Axiomatic Set Theory, 1) What is an ordered pair?

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Zermelo Fraenkel Choice

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Russell's Paradox - a simple explanation of a profound problem

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Semialgebras and Algebras

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Using topology for discrete problems | The Borsuk-Ulam theorem and stolen necklaces