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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 7037. Proofs should normally use mulcom 7102 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 6979 | . . . 4 class ℂ | |
3 | 1, 2 | wcel 1433 | . . 3 wff 𝐴 ∈ ℂ |
4 | cB | . . . 4 class 𝐵 | |
5 | 4, 2 | wcel 1433 | . . 3 wff 𝐵 ∈ ℂ |
6 | 3, 5 | wa 102 | . 2 wff (𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) |
7 | cmul 6986 | . . . 4 class · | |
8 | 1, 4, 7 | co 5532 | . . 3 class (𝐴 · 𝐵) |
9 | 4, 1, 7 | co 5532 | . . 3 class (𝐵 · 𝐴) |
10 | 8, 9 | wceq 1284 | . 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 7102 |
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