Relation
A relation on a set is a subset ; we write when .
Examples on the naturals
Relations on : when and share the same final digit; when ; when ; only when ; and when .
Related
Stated in
- Definition 2.26 (Relation)ยง2.3 Relations

Relation
A relation on a set is a subset ; we write when .
Relations on : when and share the same final digit; when ; when ; only when ; and when .