single-valued relation

Stream: Is there code for X?

[Reid Barton]

Do we already have a definition for a relation r being single-valued (a.k.a. "univalent"), i.e., the graph of a partial function: \forall x y y', r x y -> r x y' -> y = y')?

[Reid Barton]

to answer my own question: relator.right_unique