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| Mirrors > Home > MPE Home > Th. List > ltdivmul | Structured version Visualization version GIF version | ||
| Description: 'Less than' relationship between division and multiplication. (Contributed by NM, 18-Nov-2004.) |
| Ref | Expression |
|---|---|
| ltdivmul | ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ (𝐶 ∈ ℝ ∧ 0 < 𝐶)) → ((𝐴 / 𝐶) < 𝐵 ↔ 𝐴 < (𝐶 · 𝐵))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | remulcl 11312 | . . . . . 6 ⊢ ((𝐶 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐶 · 𝐵) ∈ ℝ) | |
| 2 | 1 | ancoms 464 | . . . . 5 ⊢ ((𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐶 · 𝐵) ∈ ℝ) |
| 3 | 2 | adantrr 730 | . . . 4 ⊢ ((𝐵 ∈ ℝ ∧ (𝐶 ∈ ℝ ∧ 0 < 𝐶)) → (𝐶 · 𝐵) ∈ ℝ) |
| 4 | 3 | 3adant1 1148 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ (𝐶 ∈ ℝ ∧ 0 < 𝐶)) → (𝐶 · 𝐵) ∈ ℝ) |
| 5 | ltdiv1 12208 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ (𝐶 · 𝐵) ∈ ℝ ∧ (𝐶 ∈ ℝ ∧ 0 < 𝐶)) → (𝐴 < (𝐶 · 𝐵) ↔ (𝐴 / 𝐶) < ((𝐶 · 𝐵) / 𝐶))) | |
| 6 | 4, 5 | syld3an2 1439 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ (𝐶 ∈ ℝ ∧ 0 < 𝐶)) → (𝐴 < (𝐶 · 𝐵) ↔ (𝐴 / 𝐶) < ((𝐶 · 𝐵) / 𝐶))) |
| 7 | recn 11317 | . . . . . 6 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℂ) | |
| 8 | 7 | adantr 486 | . . . . 5 ⊢ ((𝐵 ∈ ℝ ∧ (𝐶 ∈ ℝ ∧ 0 < 𝐶)) → 𝐵 ∈ ℂ) |
| 9 | recn 11317 | . . . . . 6 ⊢ (𝐶 ∈ ℝ → 𝐶 ∈ ℂ) | |
| 10 | 9 | ad2antrl 741 | . . . . 5 ⊢ ((𝐵 ∈ ℝ ∧ (𝐶 ∈ ℝ ∧ 0 < 𝐶)) → 𝐶 ∈ ℂ) |
| 11 | gt0ne0 11808 | . . . . . 6 ⊢ ((𝐶 ∈ ℝ ∧ 0 < 𝐶) → 𝐶 ≠ 0) | |
| 12 | 11 | adantl 487 | . . . . 5 ⊢ ((𝐵 ∈ ℝ ∧ (𝐶 ∈ ℝ ∧ 0 < 𝐶)) → 𝐶 ≠ 0) |
| 13 | 8, 10, 12 | divcan3d 12125 | . . . 4 ⊢ ((𝐵 ∈ ℝ ∧ (𝐶 ∈ ℝ ∧ 0 < 𝐶)) → ((𝐶 · 𝐵) / 𝐶) = 𝐵) |
| 14 | 13 | 3adant1 1148 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ (𝐶 ∈ ℝ ∧ 0 < 𝐶)) → ((𝐶 · 𝐵) / 𝐶) = 𝐵) |
| 15 | 14 | breq2d 5118 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ (𝐶 ∈ ℝ ∧ 0 < 𝐶)) → ((𝐴 / 𝐶) < ((𝐶 · 𝐵) / 𝐶) ↔ (𝐴 / 𝐶) < 𝐵)) |
| 16 | 6, 15 | bitr2d 283 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ (𝐶 ∈ ℝ ∧ 0 < 𝐶)) → ((𝐴 / 𝐶) < 𝐵 ↔ 𝐴 < (𝐶 · 𝐵))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 = wceq 1570 ∈ wcel 2147 ≠ wne 2959 class class class wbr 5106 (class class class)co 7443 ℂcc 11225 ℝcr 11226 0cc0 11227 · cmul 11232 < clt 11370 / cdiv 12000 |
| 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 5252 ax-nul 5263 ax-pow 5331 ax-pr 5395 ax-un 7775 ax-resscn 11284 ax-1cn 11285 ax-icn 11286 ax-addcl 11287 ax-addrcl 11288 ax-mulcl 11289 ax-mulrcl 11290 ax-mulcom 11291 ax-addass 11292 ax-mulass 11293 ax-distr 11294 ax-i2m1 11295 ax-1ne0 11296 ax-1rid 11297 ax-rnegex 11298 ax-rrecex 11299 ax-cnre 11300 ax-pre-lttri 11301 ax-pre-lttrn 11302 ax-pre-ltadd 11303 ax-pre-mulgt0 11304 |
| 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 4839 df-uni 4871 df-br 5107 df-opab 5171 df-mpt 5190 df-id 5550 df-po 5563 df-so 5564 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-iota 6512 df-fun 6560 df-fn 6561 df-f 6562 df-f1 6563 df-fo 6564 df-f1o 6565 df-fv 6566 df-riota 7400 df-ov 7446 df-oprab 7447 df-mpo 7448 df-er 8745 df-en 9002 df-dom 9003 df-sdom 9004 df-pnf 11372 df-mnf 11373 df-xr 11374 df-ltxr 11375 df-le 11376 df-sub 11570 df-neg 11571 df-div 12001 |
| This theorem is used by: ltdivmul2 12221 lt2mul2div 12222 ltrec 12226 supmul1 12313 avglt2 12612 3halfnz 12805 rpnnen1lem2 13132 rpnnen1lem1 13133 rpnnen1lem3 13134 rpnnen1lem5 13136 ltdivmuld 13242 qbtwnre 13356 modid 14063 expnbnd 14403 mertenslem1 16082 tanhlt1 16357 eirrlem 16401 fldivp1 17104 pcfaclem 17105 4sqlem12 17163 icopnfcnv 25293 ovolscalem1 25864 mbfmulc2lem 25998 itg2monolem3 26103 dveflem 26329 dvlt0 26355 ftc1lem4 26389 radcnvlem1 26770 tangtx 26864 cosne0 26887 cosordlem 26888 efif1olem4 26903 logcnlem4 27003 logf1o2 27008 atantan 27281 atanbndlem 27283 birthdaylem3 27311 basellem3 27440 ppiub 27561 bposlem1 27641 bposlem2 27642 bposlem6 27646 bposlem8 27648 gausslemma2dlem0c 27715 lgsquadlem1 27737 2sqlem8 27783 chebbnd1lem3 27828 chebbnd1 27829 ostth2lem2 27991 ex-fl 31078 nn0prpwlem 37288 ftc1cnnclem 38801 stoweidlem13 47228 logblt1b 49881 fldivexpfllog2 49882 |
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