Axiom ax-mulass 11237

Description: Multiplication of complex numbers is associative. Axiom 10 of 22 for real and complex numbers, justified by Theorem axmulass 11213. Proofs should normally use mulass 11259 instead. (New usage is discouraged.) (Contributed by NM, 22-Nov-1994.)

Assertion

Ref	Expression
ax-mulass	⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → ((𝐴 · 𝐵) · 𝐶) = (𝐴 · (𝐵 · 𝐶)))

Detailed syntax breakdown of Axiom ax-mulass

Step	Hyp	Ref	Expression
1		cA	. . . 4 class 𝐴
2		cc 11169	. . . 4 class ℂ
3	1, 2	wcel 2145	. . 3 wff 𝐴 ∈ ℂ
4		cB	. . . 4 class 𝐵
5	4, 2	wcel 2145	. . 3 wff 𝐵 ∈ ℂ
6		cC	. . . 4 class 𝐶
7	6, 2	wcel 2145	. . 3 wff 𝐶 ∈ ℂ
8	3, 5, 7	w3a 1103	. 2 wff (𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ)
9		cmul 11176	. . . . 5 class ·
10	1, 4, 9	co 7408	. . . 4 class (𝐴 · 𝐵)
11	10, 6, 9	co 7408	. . 3 class ((𝐴 · 𝐵) · 𝐶)
12	4, 6, 9	co 7408	. . . 4 class (𝐵 · 𝐶)
13	1, 12, 9	co 7408	. . 3 class (𝐴 · (𝐵 · 𝐶))
14	11, 13	wceq 1570	. 2 wff ((𝐴 · 𝐵) · 𝐶) = (𝐴 · (𝐵 · 𝐶))
15	8, 14	wi 4	1 wff ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → ((𝐴 · 𝐵) · 𝐶) = (𝐴 · (𝐵 · 𝐶)))

This axiom is used by:  mulass  11259