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| Mirrors > Home > MPE Home > Th. List > divneg | Structured version Visualization version GIF version | ||
| Description: Move negative sign inside of a division. (Contributed by NM, 17-Sep-2004.) |
| Ref | Expression |
|---|---|
| divneg | ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → -(𝐴 / 𝐵) = ( -𝐴 / 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | reccl 12021 | . . . 4 ⊢ ((𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → (1 / 𝐵) ∈ ℂ) | |
| 2 | mulneg1 11791 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (1 / 𝐵) ∈ ℂ) → ( -𝐴 · (1 / 𝐵)) = -(𝐴 · (1 / 𝐵))) | |
| 3 | 1, 2 | sylan2 605 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ (𝐵 ∈ ℂ ∧ 𝐵 ≠ 0)) → ( -𝐴 · (1 / 𝐵)) = -(𝐴 · (1 / 𝐵))) |
| 4 | 3 | 3impb 1132 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → ( -𝐴 · (1 / 𝐵)) = -(𝐴 · (1 / 𝐵))) |
| 5 | negcl 11596 | . . 3 ⊢ (𝐴 ∈ ℂ → -𝐴 ∈ ℂ) | |
| 6 | divrec 12030 | . . 3 ⊢ (( -𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → ( -𝐴 / 𝐵) = ( -𝐴 · (1 / 𝐵))) | |
| 7 | 5, 6 | syl3an1 1181 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → ( -𝐴 / 𝐵) = ( -𝐴 · (1 / 𝐵))) |
| 8 | divrec 12030 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → (𝐴 / 𝐵) = (𝐴 · (1 / 𝐵))) | |
| 9 | 8 | negeqd 11590 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → -(𝐴 / 𝐵) = -(𝐴 · (1 / 𝐵))) |
| 10 | 4, 7, 9 | 3eqtr4rd 2809 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → -(𝐴 / 𝐵) = ( -𝐴 / 𝐵)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∧ w3a 1103 = wceq 1570 ∈ wcel 2147 ≠ wne 2959 (class class class)co 7451 ℂcc 11237 0cc0 11239 1c1 11240 · cmul 11244 -cneg 11581 / cdiv 12013 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 ax-resscn 11296 ax-1cn 11297 ax-icn 11298 ax-addcl 11299 ax-addrcl 11300 ax-mulcl 11301 ax-mulrcl 11302 ax-mulcom 11303 ax-addass 11304 ax-mulass 11305 ax-distr 11306 ax-i2m1 11307 ax-1ne0 11308 ax-1rid 11309 ax-rnegex 11310 ax-rrecex 11311 ax-cnre 11312 ax-pre-lttri 11313 ax-pre-lttrn 11314 ax-pre-ltadd 11315 ax-pre-mulgt0 11316 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-br 5109 df-opab 5174 df-mpt 5193 df-id 5553 df-po 5566 df-so 5567 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-riota 7408 df-ov 7454 df-oprab 7455 df-mpo 7456 df-er 8755 df-en 9012 df-dom 9013 df-sdom 9014 df-pnf 11384 df-mnf 11385 df-xr 11386 df-ltxr 11387 df-le 11388 df-sub 11582 df-neg 11583 df-div 12014 |
| This theorem is used by: divsubdir 12050 divsubdiv 12073 div2neg 12080 divneg2 12081 divnegd 12146 zeo 12825 efi4p 16349 sinneg 16358 tanneg 16360 cos2bnd 16400 cxpsqrtlem 27087 1cubrlem 27226 atancj 27295 efiatan 27297 atantan 27308 atanbndlem 27310 log2cnv 27329 ppiub 27588 quad3 36643 cos2h 38802 tan2h 38803 lhe4.4ex1a 45574 dirkertrigeqlem3 47383 fourierdlem62 47451 fourierdlem103 47492 fourierswlem 47513 enege 49016 onego 49017 0nodd 49540 bru3eq 49756 dvcot 51286 |
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