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| Mirrors > Home > MPE Home > Th. List > div23 | Structured version Visualization version GIF version | ||
| Description: A commutative/associative law for division. (Contributed by NM, 2-Aug-2004.) |
| Ref | Expression |
|---|---|
| div23 | ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0)) → ((𝐴 · 𝐵) / 𝐶) = ((𝐴 / 𝐶) · 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mulcom 11154 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (𝐴 · 𝐵) = (𝐵 · 𝐴)) | |
| 2 | 1 | oveq1d 7402 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((𝐴 · 𝐵) / 𝐶) = ((𝐵 · 𝐴) / 𝐶)) |
| 3 | 2 | 3adant3 1132 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0)) → ((𝐴 · 𝐵) / 𝐶) = ((𝐵 · 𝐴) / 𝐶)) |
| 4 | divass 11855 | . . 3 ⊢ ((𝐵 ∈ ℂ ∧ 𝐴 ∈ ℂ ∧ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0)) → ((𝐵 · 𝐴) / 𝐶) = (𝐵 · (𝐴 / 𝐶))) | |
| 5 | 4 | 3com12 1123 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0)) → ((𝐵 · 𝐴) / 𝐶) = (𝐵 · (𝐴 / 𝐶))) |
| 6 | simp2 1137 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0)) → 𝐵 ∈ ℂ) | |
| 7 | divcl 11843 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐶 ∈ ℂ ∧ 𝐶 ≠ 0) → (𝐴 / 𝐶) ∈ ℂ) | |
| 8 | 7 | 3expb 1120 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0)) → (𝐴 / 𝐶) ∈ ℂ) |
| 9 | 8 | 3adant2 1131 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0)) → (𝐴 / 𝐶) ∈ ℂ) |
| 10 | 6, 9 | mulcomd 11195 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0)) → (𝐵 · (𝐴 / 𝐶)) = ((𝐴 / 𝐶) · 𝐵)) |
| 11 | 3, 5, 10 | 3eqtrd 2768 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0)) → ((𝐴 · 𝐵) / 𝐶) = ((𝐴 / 𝐶) · 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1086 = wceq 1540 ∈ wcel 2109 ≠ wne 2925 (class class class)co 7387 ℂcc 11066 0cc0 11068 · cmul 11073 / cdiv 11835 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5251 ax-nul 5261 ax-pow 5320 ax-pr 5387 ax-un 7711 ax-resscn 11125 ax-1cn 11126 ax-icn 11127 ax-addcl 11128 ax-addrcl 11129 ax-mulcl 11130 ax-mulrcl 11131 ax-mulcom 11132 ax-addass 11133 ax-mulass 11134 ax-distr 11135 ax-i2m1 11136 ax-1ne0 11137 ax-1rid 11138 ax-rnegex 11139 ax-rrecex 11140 ax-cnre 11141 ax-pre-lttri 11142 ax-pre-lttrn 11143 ax-pre-ltadd 11144 ax-pre-mulgt0 11145 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3354 df-reu 3355 df-rab 3406 df-v 3449 df-sbc 3754 df-csb 3863 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-nul 4297 df-if 4489 df-pw 4565 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4872 df-br 5108 df-opab 5170 df-mpt 5189 df-id 5533 df-po 5546 df-so 5547 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-dm 5648 df-rn 5649 df-res 5650 df-ima 5651 df-iota 6464 df-fun 6513 df-fn 6514 df-f 6515 df-f1 6516 df-fo 6517 df-f1o 6518 df-fv 6519 df-riota 7344 df-ov 7390 df-oprab 7391 df-mpo 7392 df-er 8671 df-en 8919 df-dom 8920 df-sdom 8921 df-pnf 11210 df-mnf 11211 df-xr 11212 df-ltxr 11213 df-le 11214 df-sub 11407 df-neg 11408 df-div 11836 |
| This theorem is referenced by: div32 11857 div13 11858 subdivcomb2 11878 divdiv32 11890 dmdcan 11892 div23i 11940 div23d 11995 digit2 14201 mulsubdivbinom2 14227 facdiv 14252 mertenslem1 15850 mulsucdiv2z 16323 bposlem9 27203 lgsquadlem2 27292 2lgslem3a 27307 2lgslem3b 27308 2lgslem3c 27309 2lgslem3d 27310 chtppilimlem2 27385 vmadivsum 27393 dchrmusum2 27405 dchrvmasumlem1 27406 dchrvmasumlem2 27409 mudivsum 27441 mulog2sumlem2 27446 selberglem1 27456 selberglem2 27457 selberg2lem 27461 pntibndlem2 27502 pntlemb 27508 pntlemn 27511 pntlemr 27513 pntlemj 27514 pntlemf 27516 pntlemk 27517 pntlemo 27518 siii 30782 riesz3i 31991 dpexpp1 32828 lighneallem3 47608 dignn0fr 48590 line2 48741 |
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