Theorem rncnv

Description: Range of converse is the domain. (Contributed by Peter Mazsa, 12-Feb-2018)

	Ref	Expression
Assertion	rncnv	⊢ ran ◡ 𝐴 = dom 𝐴

Proof

Step	Hyp	Ref	Expression
1		dfdm4	⊢ dom 𝐴 = ran ◡ 𝐴
2	1	eqcomi	⊢ ran ◡ 𝐴 = dom 𝐴