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| Mirrors > Home > MPE Home > Th. List > mul12i | Structured version Visualization version GIF version | ||
| Description: Commutative/associative law that swaps the first two factors in a triple product. (Contributed by NM, 11-May-1999.) (Proof shortened by Andrew Salmon, 19-Nov-2011.) |
| Ref | Expression |
|---|---|
| mul.1 | ⊢ 𝐴 ∈ ℂ |
| mul.2 | ⊢ 𝐵 ∈ ℂ |
| mul.3 | ⊢ 𝐶 ∈ ℂ |
| Ref | Expression |
|---|---|
| mul12i | ⊢ (𝐴 · (𝐵 · 𝐶)) = (𝐵 · (𝐴 · 𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mul.1 | . 2 ⊢ 𝐴 ∈ ℂ | |
| 2 | mul.2 | . 2 ⊢ 𝐵 ∈ ℂ | |
| 3 | mul.3 | . 2 ⊢ 𝐶 ∈ ℂ | |
| 4 | mul12 11482 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → (𝐴 · (𝐵 · 𝐶)) = (𝐵 · (𝐴 · 𝐶))) | |
| 5 | 1, 2, 3, 4 | mp3an 1490 | 1 ⊢ (𝐴 · (𝐵 · 𝐶)) = (𝐵 · (𝐴 · 𝐶)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1569 ∈ wcel 2144 (class class class)co 7424 ℂcc 11205 · cmul 11212 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 ax-mulcom 11271 ax-mulass 11273 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2099 df-clab 2739 df-cleq 2752 df-clel 2835 df-rab 3413 df-v 3452 df-ss 3897 df-dif 4046 df-un 4150 df-nul 4278 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-iota 6497 df-fv 6551 df-ov 7427 |
| This theorem is used by: decmul10add 12895 faclbnd4lem1 14444 bpoly3 16233 decsplit 17269 root1eq1 27092 cxpeq 27094 1cubrlem 27178 efiatan2 27254 2efiatan 27255 tanatan 27256 log2ublem2 27284 log2ublem3 27285 bposlem8 27627 ax5seglem7 29522 ip1ilem 31437 ipasslem10 31450 polid2i 31768 3exp4mod41 48837 |
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