Is there a word for the type of relation $R$ and $S$ are with respect to each other, if $xRy \iff ySx$? Reciprocal relations?
2026-04-06 06:26:42.1775456802
Type of relation (between relations)
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These are called inverse relations.
We can write $R = S^{-1}$ or $S^{\leftarrow}$
Note this must be true for all $x$ and $y$ in the domains/codomains for this.