Theorem 4an21 48340

Description: Rearrangement of 4 conjuncts with a triple conjunction. (Contributed by AV, 4-Mar-2022.)

Assertion

Ref	Expression
4an21	⊢ (((𝜑 ∧ 𝜓) ∧ 𝜒 ∧ 𝜃) ↔ (𝜓 ∧ (𝜑 ∧ 𝜒 ∧ 𝜃)))

Proof of Theorem 4an21

Step	Hyp	Ref	Expression
1		3anass 1111	. 2 ⊢ (((𝜑 ∧ 𝜓) ∧ 𝜒 ∧ 𝜃) ↔ ((𝜑 ∧ 𝜓) ∧ (𝜒 ∧ 𝜃)))
2		ancom 466	. . . 4 ⊢ ((𝜑 ∧ 𝜓) ↔ (𝜓 ∧ 𝜑))
3	2	anbi1i 636	. . 3 ⊢ (((𝜑 ∧ 𝜓) ∧ (𝜒 ∧ 𝜃)) ↔ ((𝜓 ∧ 𝜑) ∧ (𝜒 ∧ 𝜃)))
4		anass 474	. . . 4 ⊢ (((𝜓 ∧ 𝜑) ∧ (𝜒 ∧ 𝜃)) ↔ (𝜓 ∧ (𝜑 ∧ (𝜒 ∧ 𝜃))))
5		3anass 1111	. . . . . 6 ⊢ ((𝜑 ∧ 𝜒 ∧ 𝜃) ↔ (𝜑 ∧ (𝜒 ∧ 𝜃)))
6	5	bicomi 227	. . . . 5 ⊢ ((𝜑 ∧ (𝜒 ∧ 𝜃)) ↔ (𝜑 ∧ 𝜒 ∧ 𝜃))
7	6	anbi2i 635	. . . 4 ⊢ ((𝜓 ∧ (𝜑 ∧ (𝜒 ∧ 𝜃))) ↔ (𝜓 ∧ (𝜑 ∧ 𝜒 ∧ 𝜃)))
8	4, 7	bitri 278	. . 3 ⊢ (((𝜓 ∧ 𝜑) ∧ (𝜒 ∧ 𝜃)) ↔ (𝜓 ∧ (𝜑 ∧ 𝜒 ∧ 𝜃)))
9	3, 8	bitri 278	. 2 ⊢ (((𝜑 ∧ 𝜓) ∧ (𝜒 ∧ 𝜃)) ↔ (𝜓 ∧ (𝜑 ∧ 𝜒 ∧ 𝜃)))
10	1, 9	bitri 278	1 ⊢ (((𝜑 ∧ 𝜓) ∧ 𝜒 ∧ 𝜃) ↔ (𝜓 ∧ (𝜑 ∧ 𝜒 ∧ 𝜃)))

This proof depends on syntax axioms:   ↔ wb 209   ∧ wa 401   ∧ w3a 1103

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This proof depends on definitions:  df-bi 210  df-an 402  df-3an 1105

This theorem is used by: (None)