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Relation domain
Definition
Let
| $ R $ |
be a set with
| $ c\in R $ |
| $ \forall c.\ \exists a,b.\ c=\langle a,b\rangle $ |
Then
| $ x\in \mathrm{dom}(R) $ |
if
| $ \exists y.\ \langle x,y \rangle\in R $ |
Discussion
Reference
Wikipedia: Domain of a function
Context
Requirements
