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relation_domain [2013/05/18 12:56] 127.0.0.1 external edit |
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===== Relation domain ===== | ===== Relation domain ===== | ||
- | ==== Definition ==== | + | ==== Set ==== |
- | | $ R $ | | + | Let |
+ | | @#55CCEE: context | @#55CCEE: $ R $ | | ||
+ | be a set with | ||
+ | | $ c\in R $ | | ||
+ | | @#55EE55: postulate | @#55EE55: $ \forall c.\ \exists a,b.\ c=\langle a,b\rangle $ | | ||
+ | Then | ||
+ | | @#FFBB00: definiendum | @#FFBB00: $ x\in \mathrm{dom}(R) $ | | ||
+ | if | ||
+ | | @#55EE55: postulate | @#55EE55: $ \exists y.\ \langle x,y \rangle\in R $ | | ||
- | | $ \forall_f c\ \exists a,b\ (c=\langle a,b\rangle) $ | | + | ==== Discussion ==== |
- | + | ||
- | ^ $ x\in \mathrm{dom}(R) $ ^ | + | |
- | + | ||
- | ^ $ \exists y\ (\langle x,y \rangle\in R) $ ^ | + | |
- | + | ||
- | ==== Ramifications ==== | + | |
=== Reference === | === Reference === | ||
- | |||
- | Mizar files:[[http://markun.cs.shinshu-u.ac.jp/mirror/mizar/JFM/Vol1/relat_1.html|RELAT_1]] | ||
- | |||
Wikipedia: [[http://en.wikipedia.org/wiki/Domain_of_a_function|Domain of a function]] | Wikipedia: [[http://en.wikipedia.org/wiki/Domain_of_a_function|Domain of a function]] | ||
- | + | ==== Parents ==== | |
- | ==== Context ==== | + | === Context === |
- | Set constructor | + | |
- | === Parents === | + | |
[[Ordered pair]] | [[Ordered pair]] | ||