Metamath Proof Explorer


Theorem bnj432

Description: /\ -manipulation. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.)

Ref Expression
Assertion bnj432 ( ( 𝜑𝜓𝜒𝜃 ) ↔ ( ( 𝜒𝜃 ) ∧ ( 𝜑𝜓 ) ) )

Proof

Step Hyp Ref Expression
1 bnj422 ( ( 𝜑𝜓𝜒𝜃 ) ↔ ( 𝜒𝜃𝜑𝜓 ) )
2 bnj256 ( ( 𝜒𝜃𝜑𝜓 ) ↔ ( ( 𝜒𝜃 ) ∧ ( 𝜑𝜓 ) ) )
3 1 2 bitri ( ( 𝜑𝜓𝜒𝜃 ) ↔ ( ( 𝜒𝜃 ) ∧ ( 𝜑𝜓 ) ) )