Theorem simpr

Description: Elimination of a conjunct. Theorem *3.27 (Simp) of WhiteheadRussell p. 112. (Contributed by NM, 3-Jan-1993) (Proof shortened by Wolf Lammen, 14-Jun-2022)

	Ref	Expression
Assertion	simpr	$$⊢\left(\phi \wedge \psi \right)\to \psi$$

Proof

Step	Hyp	Ref	Expression
1		id	$$⊢\psi \to \psi$$
2	1	adantl	$$⊢\left(\phi \wedge \psi \right)\to \psi$$