Theorem 19.2d

Description: Deduction associated with 19.2 . (Contributed by BJ, 12-May-2019)

	Ref	Expression
Hypothesis	19.2d.1	$$⊢\phi \to \forall x\psi$$
Assertion	19.2d	$$⊢\phi \to \exists x\psi$$

Proof

Step	Hyp	Ref	Expression
1		19.2d.1	$$⊢\phi \to \forall x\psi$$
2		19.2	$$⊢\forall x\psi \to \exists x\psi$$
3	1 2	syl	$$⊢\phi \to \exists x\psi$$