Definition:Trivial Relation

Definition
The trivial relation is the relation $\mathcal R \subseteq S \times T$ in $S$ to $T$ such that every element of $S$ relates to every element in $T$:


 * $\mathcal R: S \times T: \forall \left({s, t}\right) \in S \times T: \left({s, t}\right) \in \mathcal R$

That is:
 * $\mathcal R = S \times T$

... the relation which equals the product of the sets on which it is defined.