Theorem nfcv

Description: If x is disjoint from A , then x is not free in A . (Contributed by Mario Carneiro, 11-Aug-2016)

	Ref	Expression
Assertion	nfcv	⊢ Ⅎ 𝑥 𝐴

Proof

Step	Hyp	Ref	Expression
1		nfv	⊢ Ⅎ 𝑥 𝑦 ∈ 𝐴
2	1	nfci	⊢ Ⅎ 𝑥 𝐴