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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 11890 | . . . 4 ⊢ ((𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → (1 / 𝐵) ∈ ℂ) | |
| 2 | mulneg1 11661 | . . . 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 11468 | . . 3 ⊢ (𝐴 ∈ ℂ → -𝐴 ∈ ℂ) | |
| 6 | divrec 11899 | . . 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 11899 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → (𝐴 / 𝐵) = (𝐴 · (1 / 𝐵))) | |
| 9 | 8 | negeqd 11462 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → -(𝐴 / 𝐵) = -(𝐴 · (1 / 𝐵))) |
| 10 | 4, 7, 9 | 3eqtr4rd 2811 | 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 2146 ≠ wne 2960 (class class class)co 7416 ℂcc 11109 0cc0 11111 1c1 11112 · cmul 11116 -cneg 11453 / cdiv 11882 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7738 ax-resscn 11168 ax-1cn 11169 ax-icn 11170 ax-addcl 11171 ax-addrcl 11172 ax-mulcl 11173 ax-mulrcl 11174 ax-mulcom 11175 ax-addass 11176 ax-mulass 11177 ax-distr 11178 ax-i2m1 11179 ax-1ne0 11180 ax-1rid 11181 ax-rnegex 11182 ax-rrecex 11183 ax-cnre 11184 ax-pre-lttri 11185 ax-pre-lttrn 11186 ax-pre-ltadd 11187 ax-pre-mulgt0 11188 |
| 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 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3067 df-ral 3082 df-rex 3092 df-rmo 3371 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-br 5112 df-opab 5176 df-mpt 5195 df-id 5558 df-po 5571 df-so 5572 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-er 8696 df-en 8946 df-dom 8947 df-sdom 8948 df-pnf 11256 df-mnf 11257 df-xr 11258 df-ltxr 11259 df-le 11260 df-sub 11454 df-neg 11455 df-div 11883 |
| This theorem is used by: divsubdir 11919 divsubdiv 11942 div2neg 11949 divneg2 11950 divnegd 12015 zeo 12693 efi4p 16210 sinneg 16219 tanneg 16221 cos2bnd 16261 cxpsqrtlem 26896 1cubrlem 27035 atancj 27104 efiatan 27106 atantan 27117 atanbndlem 27119 log2cnv 27138 ppiub 27397 quad3 36175 cos2h 38295 tan2h 38296 lhe4.4ex1a 45072 dirkertrigeqlem3 46847 fourierdlem62 46915 fourierdlem103 46956 fourierswlem 46977 enege 48443 onego 48444 0nodd 48968 |
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