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Metamath Proof Explorer

Theorem simpl

Description: Elimination of a conjunct. Theorem *3.26 (Simp) of WhiteheadRussell p. 112. (Contributed by NM, 3-Jan-1993) (Proof shortened by Wolf Lammen, 14-Jun-2022)

		Ref	Expression
	Assertion	simpl	$⊢ (φ \land ψ) \to φ$

Proof

Step	Hyp	Ref	Expression
1		id	$⊢ φ \to φ$
2	1	adantr	$⊢ (φ \land ψ) \to φ$