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| Mirrors > Home > ILE Home > Th. List > ax-mulcom | GIF version | ||
| Description: Multiplication of complex numbers is commutative. Axiom for real and complex numbers, justified by Theorem axmulcom 8202. Proofs should normally use mulcom 8272 instead. (New usage is discouraged.) (Contributed by NM, 22-Nov-1994.) |
| Ref | Expression |
|---|---|
| ax-mulcom | ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (𝐴 · 𝐵) = (𝐵 · 𝐴)) |
| 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 | 3, 5 | wa 104 | . 2 wff (𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) |
| 7 | cmul 8148 | . . . 4 class · | |
| 8 | 1, 4, 7 | co 6058 | . . 3 class (𝐴 · 𝐵) |
| 9 | 4, 1, 7 | co 6058 | . . 3 class (𝐵 · 𝐴) |
| 10 | 8, 9 | wceq 1398 | . 2 wff (𝐴 · 𝐵) = (𝐵 · 𝐴) |
| 11 | 6, 10 | wi 4 | 1 wff ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (𝐴 · 𝐵) = (𝐵 · 𝐴)) |
| Colors of variables: wff set class |
| This axiom is referenced by: mulcom 8272 |
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