Theorem cnvcnvssOLD

Description: Obsolete version of cnvcnvss as of 10-Jun-2026. (Contributed by NM, 23-Jul-2004) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Assertion	cnvcnvssOLD	⊢ ◡ ◡ 𝐴 ⊆ 𝐴

Proof

Step	Hyp	Ref	Expression
1		cnvcnv	⊢ ◡ ◡ 𝐴 = ( 𝐴 ∩ ( V × V ) )
2		inss1	⊢ ( 𝐴 ∩ ( V × V ) ) ⊆ 𝐴
3	1 2	eqsstri	⊢ ◡ ◡ 𝐴 ⊆ 𝐴