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| ===== Ordered pair ===== | ===== Ordered pair ===== | ||
| - | ==== Definition ==== | + | ==== Set ==== |
| - | | @#88DDEE: $ X,Y $ | | + | | @#55CCEE: context | @#55CCEE: $ X,Y $ | |
| - | | @#FFBB00: $ \langle X,Y \rangle \equiv \{\{X\},\{X,Y\}\} $ | | + | | @#FFBB00: definiendum | @#FFBB00: $ \langle X,Y \rangle \equiv \{\{X\},\{X,Y\}\} $ | |
| ==== Discussion ==== | ==== Discussion ==== | ||
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| === Reference === | === Reference === | ||
| - | Mizar files: [[http://markun.cs.shinshu-u.ac.jp/mirror/mizar/JFM/Axiomatics/tarski.html|TARSKI]], [[http://markun.cs.shinshu-u.ac.jp/mirror/mizar/JFM/Vol1/relat_1.html|RELAT_1]], [[http://mizar.org/JFM/Vol1/mcart_1.html|MCART_1]] | ||
| - | |||
| Wikipedia: [[http://en.wikipedia.org/wiki/Ordered_pair|Ordered pair]] | Wikipedia: [[http://en.wikipedia.org/wiki/Ordered_pair|Ordered pair]] | ||
| - | |||
| ==== Parents ==== | ==== Parents ==== | ||
| - | === Requirements === | + | === Context === |
| [[Unordered pair]] | [[Unordered pair]] | ||
