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Metamath Proof Explorer

Theorem 19.2d

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

		Ref	Expression
	Hypothesis	19.2d.1	$⊢ φ \to \forall x ψ$
	Assertion	19.2d	$⊢ φ \to \exists x ψ$

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