Definition:Relation/Unary Relation
Jump to navigation
Jump to search
Definition
As a special case of an $n$-ary relation on $S$, note that when $n = 1$ we define a unary relation on $S$ as:
- $\RR \subseteq S$
That is, a unary relation is a subset of $S$.
Also see
Linguistic Note
The word unary is pronounced yoo-nary.
Hence when the indefinite article precedes it, the form is (for example) a unary operation.
Sources
- 1993: Keith Devlin: The Joy of Sets: Fundamentals of Contemporary Set Theory (2nd ed.) ... (previous) ... (next): $\S 1$: Naive Set Theory: $\S 1.5$: Relations