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	|- ( ( ph /\ ps ) -> ph )

Proof

Step	Hyp	Ref	Expression
1		id	|- ( ph -> ph )
2	1	adantr	|- ( ( ph /\ ps ) -> ph )