Axiom ax-addass 8245

Description: Addition of complex numbers is associative. Axiom for real and complex numbers, justified by Theorem axaddass 8203. Proofs should normally use addass 8273 instead. (New usage is discouraged.) (Contributed by NM, 22-Nov-1994.)

Assertion

Ref	Expression
ax-addass	⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → ((𝐴 + 𝐵) + 𝐶) = (𝐴 + (𝐵 + 𝐶)))

Detailed syntax breakdown of Axiom ax-addass

Step	Hyp	Ref	Expression
1		cA	. . . 4 class 𝐴
2		cc 8141	. . . 4 class ℂ
3	1, 2	wcel 2205	. . 3 wff 𝐴 ∈ ℂ
4		cB	. . . 4 class 𝐵
5	4, 2	wcel 2205	. . 3 wff 𝐵 ∈ ℂ
6		cC	. . . 4 class 𝐶
7	6, 2	wcel 2205	. . 3 wff 𝐶 ∈ ℂ
8	3, 5, 7	w3a 1005	. 2 wff (𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ)
9		caddc 8146	. . . . 5 class +
10	1, 4, 9	co 6058	. . . 4 class (𝐴 + 𝐵)
11	10, 6, 9	co 6058	. . 3 class ((𝐴 + 𝐵) + 𝐶)
12	4, 6, 9	co 6058	. . . 4 class (𝐵 + 𝐶)
13	1, 12, 9	co 6058	. . 3 class (𝐴 + (𝐵 + 𝐶))
14	11, 13	wceq 1398	. 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 referenced by:  addass  8273