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| Mirrors > Home > MPE Home > Th. List > mul32 | Structured version Visualization version GIF version | ||
| Description: Commutative/associative law. (Contributed by NM, 8-Oct-1999.) |
| Ref | Expression |
|---|---|
| mul32 | ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → ((𝐴 · 𝐵) · 𝐶) = ((𝐴 · 𝐶) · 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mulcom 11124 | . . . 4 ⊢ ((𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → (𝐵 · 𝐶) = (𝐶 · 𝐵)) | |
| 2 | 1 | oveq2d 7384 | . . 3 ⊢ ((𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → (𝐴 · (𝐵 · 𝐶)) = (𝐴 · (𝐶 · 𝐵))) |
| 3 | 2 | 3adant1 1131 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → (𝐴 · (𝐵 · 𝐶)) = (𝐴 · (𝐶 · 𝐵))) |
| 4 | mulass 11126 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → ((𝐴 · 𝐵) · 𝐶) = (𝐴 · (𝐵 · 𝐶))) | |
| 5 | mulass 11126 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐶 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((𝐴 · 𝐶) · 𝐵) = (𝐴 · (𝐶 · 𝐵))) | |
| 6 | 5 | 3com23 1127 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → ((𝐴 · 𝐶) · 𝐵) = (𝐴 · (𝐶 · 𝐵))) |
| 7 | 3, 4, 6 | 3eqtr4d 2782 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → ((𝐴 · 𝐵) · 𝐶) = ((𝐴 · 𝐶) · 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1087 = wceq 1542 ∈ wcel 2114 (class class class)co 7368 ℂcc 11036 · cmul 11043 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 ax-mulcom 11102 ax-mulass 11104 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-rab 3402 df-v 3444 df-dif 3906 df-un 3908 df-ss 3920 df-nul 4288 df-if 4482 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-br 5101 df-iota 6456 df-fv 6508 df-ov 7371 |
| This theorem is referenced by: mul4 11313 mul02lem1 11321 mul32i 11341 mul32d 11355 muldvds1 16219 2sqlem6 27402 cnlnadjlem2 32155 cnlnadjlem7 32160 |
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