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As a special case of an $n$-ary relation on $S$, note that when $n = 1$ we define a unary relation on $S$ as:
- $\mathcal R \subseteq S$
That is, a unary relation is a subset of $S$.
The word unary is pronounced yoo-nary.
- 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