Theorem 3adant1l

Description: Deduction adding a conjunct to antecedent. (Contributed by NM, 8-Jan-2006) (Proof shortened by Wolf Lammen, 23-Jun-2022)

	Ref	Expression
Hypothesis	ad4ant3.1	|- ( ( ph /\ ps /\ ch ) -> th )
Assertion	3adant1l	|- ( ( ( ta /\ ph ) /\ ps /\ ch ) -> th )

Proof

Step	Hyp	Ref	Expression
1		ad4ant3.1	|- ( ( ph /\ ps /\ ch ) -> th )
2		simpr	|- ( ( ta /\ ph ) -> ph )
3	2 1	syl3an1	|- ( ( ( ta /\ ph ) /\ ps /\ ch ) -> th )