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Metamath Proof Explorer

Theorem pm2.62

Description: Theorem *2.62 of WhiteheadRussell p. 107. (Contributed by NM, 3-Jan-2005) (Proof shortened by Wolf Lammen, 13-Dec-2013)

		Ref	Expression
	Assertion	pm2.62	$⊢ (φ \lor ψ) \to ((φ \to ψ) \to ψ)$

Step	Hyp	Ref	Expression
1		pm2.621	$⊢ (φ \to ψ) \to ((φ \lor ψ) \to ψ)$
2	1	com12	$⊢ (φ \lor ψ) \to ((φ \to ψ) \to ψ)$