Metamath Proof Explorer


Theorem relcnv

Description: A converse is a relation. Theorem 12 of Suppes p. 62. (Contributed by NM, 29-Oct-1996)

Ref Expression
Assertion relcnv Rel A -1

Proof

Step Hyp Ref Expression
1 df-cnv A -1 = x y | y A x
2 1 relopabiv Rel A -1