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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 8134. Proofs should normally use mulcom 8204 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 8073 | . . . 4 class ℂ | |
| 3 | 1, 2 | wcel 2202 | . . 3 wff 𝐴 ∈ ℂ |
| 4 | cB | . . . 4 class 𝐵 | |
| 5 | 4, 2 | wcel 2202 | . . 3 wff 𝐵 ∈ ℂ |
| 6 | 3, 5 | wa 104 | . 2 wff (𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) |
| 7 | cmul 8080 | . . . 4 class · | |
| 8 | 1, 4, 7 | co 6028 | . . 3 class (𝐴 · 𝐵) |
| 9 | 4, 1, 7 | co 6028 | . . 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 8204 |
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