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Metamath Proof Explorer

Theorem bj-19.21bit

Description: Closed form of 19.21bi . (Contributed by BJ, 20-Oct-2019)

		Ref	Expression
	Assertion	bj-19.21bit	$⊢ (φ \to \forall x ψ) \to (φ \to ψ)$

Step	Hyp	Ref	Expression
1		sp	$⊢ \forall x ψ \to ψ$
2	1	imim2i	$⊢ (φ \to \forall x ψ) \to (φ \to ψ)$