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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 8074. Proofs should normally use mulcom 8144 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 8013 | . . . 4 class ℂ | |
| 3 | 1, 2 | wcel 2200 | . . 3 wff 𝐴 ∈ ℂ |
| 4 | cB | . . . 4 class 𝐵 | |
| 5 | 4, 2 | wcel 2200 | . . 3 wff 𝐵 ∈ ℂ |
| 6 | 3, 5 | wa 104 | . 2 wff (𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) |
| 7 | cmul 8020 | . . . 4 class · | |
| 8 | 1, 4, 7 | co 6010 | . . 3 class (𝐴 · 𝐵) |
| 9 | 4, 1, 7 | co 6010 | . . 3 class (𝐵 · 𝐴) |
| 10 | 8, 9 | wceq 1395 | . 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 8144 |
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