Metamath Proof Explorer

Theorem bnj255

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

Ref Expression
Assertion bnj255 ⊢φ∧ψ∧χ∧θ↔φ∧ψ∧χ∧θ

Proof

Step Hyp Ref Expression
1 bnj251 ⊢φ∧ψ∧χ∧θ↔φ∧ψ∧χ∧θ
2 3anass ⊢φ∧ψ∧χ∧θ↔φ∧ψ∧χ∧θ
3 1 2 bitr4i ⊢φ∧ψ∧χ∧θ↔φ∧ψ∧χ∧θ