Diagonal Complement Relation Compatible with Group Operation
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Theorem
Let $\left({G, \circ}\right)$ be a group.
Let $\Delta_G$ be the diagonal relation on $G$.
Then $\Delta_G^c = \complement_{G \times G} \Delta_G$ is a relation compatible with $\circ$.
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In other words, $\ne$ is a relation compatible with $\circ$.
Proof
By Diagonal Relation is Universally Compatible, $\Delta_G$ is compatible with $\circ$.
By Complement of Relation Compatible with Group is Compatible , $\Delta_G^c$ is also compatible with $\circ$.
$\blacksquare$