Theorem bnj268 34723

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

Assertion

Ref	Expression
bnj268	⊢ ((𝜑 ∧ 𝜓 ∧ 𝜒 ∧ 𝜃) ↔ (𝜑 ∧ 𝜒 ∧ 𝜓 ∧ 𝜃))

Proof of Theorem bnj268

Step	Hyp	Ref	Expression
1		3ancomb 1099	. . 3 ⊢ ((𝜑 ∧ 𝜓 ∧ 𝜒) ↔ (𝜑 ∧ 𝜒 ∧ 𝜓))
2	1	anbi1i 624	. 2 ⊢ (((𝜑 ∧ 𝜓 ∧ 𝜒) ∧ 𝜃) ↔ ((𝜑 ∧ 𝜒 ∧ 𝜓) ∧ 𝜃))
3		df-bnj17 34701	. 2 ⊢ ((𝜑 ∧ 𝜓 ∧ 𝜒 ∧ 𝜃) ↔ ((𝜑 ∧ 𝜓 ∧ 𝜒) ∧ 𝜃))
4		df-bnj17 34701	. 2 ⊢ ((𝜑 ∧ 𝜒 ∧ 𝜓 ∧ 𝜃) ↔ ((𝜑 ∧ 𝜒 ∧ 𝜓) ∧ 𝜃))
5	2, 3, 4	3bitr4i 303	1 ⊢ ((𝜑 ∧ 𝜓 ∧ 𝜒 ∧ 𝜃) ↔ (𝜑 ∧ 𝜒 ∧ 𝜓 ∧ 𝜃))

Syntax hints:   ↔ wb 206   ∧ wa 395   ∧ w3a 1087   ∧ w-bnj17 34700

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 207  df-an 396  df-3an 1089  df-bnj17 34701

This theorem is referenced by:  bnj543  34907  bnj929  34950  bnj1110  34996