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unordered_pair [2015/10/09 15:51] nikolaj |
unordered_pair [2015/10/09 15:51] nikolaj |
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| === Discussion === | === Discussion === | ||
| + | $\{X,X\} \equiv \{x \mid x = X \lor x = X\} = \{x \mid x = X\} = \{X\}$ | ||
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| === Reference === | === Reference === | ||
| Wikipedia: [[http://en.wikipedia.org/wiki/Axiom_of_pairing|Axiom of pairing]] | Wikipedia: [[http://en.wikipedia.org/wiki/Axiom_of_pairing|Axiom of pairing]] | ||
