Theorem 19.2g

Description: Theorem 19.2 of Margaris p. 89, generalized to use two setvar variables. Use 19.2 when sufficient. (Contributed by Mel L. O'Cat, 31-Mar-2008)

	Ref	Expression
Assertion	19.2g	⊢ ( ∀ 𝑥 𝜑 → ∃ 𝑦 𝜑 )

Proof

Step	Hyp	Ref	Expression
1		19.8a	⊢ ( 𝜑 → ∃ 𝑦 𝜑 )
2	1	sps	⊢ ( ∀ 𝑥 𝜑 → ∃ 𝑦 𝜑 )