Relation/Examples/Sisterhood
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Example of Relation
Let $S$ be the set of all human females.
Let $T$ be the set of all human beings.
Let $\RR$ be the set defined as:
- $\RR = \set {\tuple {a, b}: a \in S, b \in T, \text {$a$ is a sister of $b$} }$
Then $\RR$ is a relation in $S$ to $T$.
Sources
- 1967: George McCarty: Topology: An Introduction with Application to Topological Groups ... (previous) ... (next): Chapter $\text{I}$: Sets and Functions: Relations