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	⊢ ( ( 𝜑 ∧ 𝜓 ∧ 𝜒 ) → 𝜃 )
Assertion	3adant1l	⊢ ( ( ( 𝜏 ∧ 𝜑 ) ∧ 𝜓 ∧ 𝜒 ) → 𝜃 )

Proof

Step	Hyp	Ref	Expression
1		ad4ant3.1	⊢ ( ( 𝜑 ∧ 𝜓 ∧ 𝜒 ) → 𝜃 )
2		simpr	⊢ ( ( 𝜏 ∧ 𝜑 ) → 𝜑 )
3	2 1	syl3an1	⊢ ( ( ( 𝜏 ∧ 𝜑 ) ∧ 𝜓 ∧ 𝜒 ) → 𝜃 )