Theorem rspccv

Description: Restricted specialization, using implicit substitution. (Contributed by NM, 2-Feb-2006)

	Ref	Expression
Hypothesis	rspcv.1	⊢ ( 𝑥 = 𝐴 → ( 𝜑 ↔ 𝜓 ) )
Assertion	rspccv	⊢ ( ∀ 𝑥 ∈ 𝐵 𝜑 → ( 𝐴 ∈ 𝐵 → 𝜓 ) )

Proof

Step	Hyp	Ref	Expression
1		rspcv.1	⊢ ( 𝑥 = 𝐴 → ( 𝜑 ↔ 𝜓 ) )
2	1	rspcv	⊢ ( 𝐴 ∈ 𝐵 → ( ∀ 𝑥 ∈ 𝐵 𝜑 → 𝜓 ) )
3	2	com12	⊢ ( ∀ 𝑥 ∈ 𝐵 𝜑 → ( 𝐴 ∈ 𝐵 → 𝜓 ) )