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Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > ltdiv23neg | Structured version Visualization version GIF version |
Description: Swap denominator with other side of 'less than', when both are negative. (Contributed by Glauco Siliprandi, 26-Jun-2021.) |
Ref | Expression |
---|---|
ltdiv23neg.1 | ⊢ (𝜑 → 𝐴 ∈ ℝ) |
ltdiv23neg.2 | ⊢ (𝜑 → 𝐵 ∈ ℝ) |
ltdiv23neg.3 | ⊢ (𝜑 → 𝐵 < 0) |
ltdiv23neg.4 | ⊢ (𝜑 → 𝐶 ∈ ℝ) |
ltdiv23neg.5 | ⊢ (𝜑 → 𝐶 < 0) |
Ref | Expression |
---|---|
ltdiv23neg | ⊢ (𝜑 → ((𝐴 / 𝐵) < 𝐶 ↔ (𝐴 / 𝐶) < 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ltdiv23neg.1 | . . . 4 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
2 | ltdiv23neg.2 | . . . 4 ⊢ (𝜑 → 𝐵 ∈ ℝ) | |
3 | ltdiv23neg.3 | . . . . 5 ⊢ (𝜑 → 𝐵 < 0) | |
4 | 2, 3 | ltned 11395 | . . . 4 ⊢ (𝜑 → 𝐵 ≠ 0) |
5 | 1, 2, 4 | redivcld 12093 | . . 3 ⊢ (𝜑 → (𝐴 / 𝐵) ∈ ℝ) |
6 | ltdiv23neg.4 | . . 3 ⊢ (𝜑 → 𝐶 ∈ ℝ) | |
7 | 5, 6, 2, 3 | ltmulneg 45342 | . 2 ⊢ (𝜑 → ((𝐴 / 𝐵) < 𝐶 ↔ (𝐶 · 𝐵) < ((𝐴 / 𝐵) · 𝐵))) |
8 | recn 11243 | . . . . 5 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ) | |
9 | 1, 8 | syl 17 | . . . 4 ⊢ (𝜑 → 𝐴 ∈ ℂ) |
10 | recn 11243 | . . . . 5 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℂ) | |
11 | 2, 10 | syl 17 | . . . 4 ⊢ (𝜑 → 𝐵 ∈ ℂ) |
12 | 9, 11, 4 | divcan1d 12042 | . . 3 ⊢ (𝜑 → ((𝐴 / 𝐵) · 𝐵) = 𝐴) |
13 | 12 | breq2d 5160 | . 2 ⊢ (𝜑 → ((𝐶 · 𝐵) < ((𝐴 / 𝐵) · 𝐵) ↔ (𝐶 · 𝐵) < 𝐴)) |
14 | remulcl 11238 | . . . . 5 ⊢ ((𝐶 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐶 · 𝐵) ∈ ℝ) | |
15 | 6, 2, 14 | syl2anc 584 | . . . 4 ⊢ (𝜑 → (𝐶 · 𝐵) ∈ ℝ) |
16 | ltdiv23neg.5 | . . . . . 6 ⊢ (𝜑 → 𝐶 < 0) | |
17 | 6, 16 | ltned 11395 | . . . . 5 ⊢ (𝜑 → 𝐶 ≠ 0) |
18 | 6, 17 | rereccld 12092 | . . . 4 ⊢ (𝜑 → (1 / 𝐶) ∈ ℝ) |
19 | 6, 16 | reclt0d 45337 | . . . 4 ⊢ (𝜑 → (1 / 𝐶) < 0) |
20 | 15, 1, 18, 19 | ltmulneg 45342 | . . 3 ⊢ (𝜑 → ((𝐶 · 𝐵) < 𝐴 ↔ (𝐴 · (1 / 𝐶)) < ((𝐶 · 𝐵) · (1 / 𝐶)))) |
21 | recn 11243 | . . . . . . 7 ⊢ (𝐶 ∈ ℝ → 𝐶 ∈ ℂ) | |
22 | 6, 21 | syl 17 | . . . . . 6 ⊢ (𝜑 → 𝐶 ∈ ℂ) |
23 | 9, 22, 17 | divrecd 12044 | . . . . 5 ⊢ (𝜑 → (𝐴 / 𝐶) = (𝐴 · (1 / 𝐶))) |
24 | 23 | eqcomd 2741 | . . . 4 ⊢ (𝜑 → (𝐴 · (1 / 𝐶)) = (𝐴 / 𝐶)) |
25 | 22, 11 | mulcld 11279 | . . . . . 6 ⊢ (𝜑 → (𝐶 · 𝐵) ∈ ℂ) |
26 | 25, 22, 17 | divrecd 12044 | . . . . 5 ⊢ (𝜑 → ((𝐶 · 𝐵) / 𝐶) = ((𝐶 · 𝐵) · (1 / 𝐶))) |
27 | divcan3 11946 | . . . . . . 7 ⊢ ((𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ ∧ 𝐶 ≠ 0) → ((𝐶 · 𝐵) / 𝐶) = 𝐵) | |
28 | 27 | 3expb 1119 | . . . . . 6 ⊢ ((𝐵 ∈ ℂ ∧ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0)) → ((𝐶 · 𝐵) / 𝐶) = 𝐵) |
29 | 11, 22, 17, 28 | syl12anc 837 | . . . . 5 ⊢ (𝜑 → ((𝐶 · 𝐵) / 𝐶) = 𝐵) |
30 | 26, 29 | eqtr3d 2777 | . . . 4 ⊢ (𝜑 → ((𝐶 · 𝐵) · (1 / 𝐶)) = 𝐵) |
31 | 24, 30 | breq12d 5161 | . . 3 ⊢ (𝜑 → ((𝐴 · (1 / 𝐶)) < ((𝐶 · 𝐵) · (1 / 𝐶)) ↔ (𝐴 / 𝐶) < 𝐵)) |
32 | 20, 31 | bitrd 279 | . 2 ⊢ (𝜑 → ((𝐶 · 𝐵) < 𝐴 ↔ (𝐴 / 𝐶) < 𝐵)) |
33 | 7, 13, 32 | 3bitrd 305 | 1 ⊢ (𝜑 → ((𝐴 / 𝐵) < 𝐶 ↔ (𝐴 / 𝐶) < 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 206 = wceq 1537 ∈ wcel 2106 ≠ wne 2938 class class class wbr 5148 (class class class)co 7431 ℂcc 11151 ℝcr 11152 0cc0 11153 1c1 11154 · cmul 11158 < clt 11293 / cdiv 11918 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 ax-resscn 11210 ax-1cn 11211 ax-icn 11212 ax-addcl 11213 ax-addrcl 11214 ax-mulcl 11215 ax-mulrcl 11216 ax-mulcom 11217 ax-addass 11218 ax-mulass 11219 ax-distr 11220 ax-i2m1 11221 ax-1ne0 11222 ax-1rid 11223 ax-rnegex 11224 ax-rrecex 11225 ax-cnre 11226 ax-pre-lttri 11227 ax-pre-lttrn 11228 ax-pre-ltadd 11229 ax-pre-mulgt0 11230 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3378 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5583 df-po 5597 df-so 5598 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-er 8744 df-en 8985 df-dom 8986 df-sdom 8987 df-pnf 11295 df-mnf 11296 df-xr 11297 df-ltxr 11298 df-le 11299 df-sub 11492 df-neg 11493 df-div 11919 df-rp 13033 |
This theorem is referenced by: pimrecltneg 46680 |
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