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unordered_pair [2015/10/09 15:51] nikolaj |
unordered_pair [2015/10/09 15:52] nikolaj |
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| === Discussion === | === Discussion === | ||
| - | $\{X,X\} \equiv \{x \mid x = X \lor x = X\} = \{x \mid x = X\} = \{X\}$ | + | $\{X,X\} = \{x \mid x = X \lor x = X\} = \{x \mid x = X\} = \{X\}$ |
| === Reference === | === Reference === | ||
