Metamath Proof Explorer


Theorem 3impb

Description: Importation from double to triple conjunction. (Contributed by NM, 20-Aug-1995)

Ref Expression
Hypothesis 3impb.1 ( ( 𝜑 ∧ ( 𝜓𝜒 ) ) → 𝜃 )
Assertion 3impb ( ( 𝜑𝜓𝜒 ) → 𝜃 )

Proof

Step Hyp Ref Expression
1 3impb.1 ( ( 𝜑 ∧ ( 𝜓𝜒 ) ) → 𝜃 )
2 1 exp32 ( 𝜑 → ( 𝜓 → ( 𝜒𝜃 ) ) )
3 2 3imp ( ( 𝜑𝜓𝜒 ) → 𝜃 )