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Metamath Proof Explorer

Theorem pm3.41

Description: Theorem *3.41 of WhiteheadRussell p. 113. (Contributed by NM, 3-Jan-2005)

		Ref	Expression
	Assertion	pm3.41	$⊢ (φ \to χ) \to ((φ \land ψ) \to χ)$

Step	Hyp	Ref	Expression
1		simpl	$⊢ (φ \land ψ) \to φ$
2	1	imim1i	$⊢ (φ \to χ) \to ((φ \land ψ) \to χ)$