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Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > ltmulneg | Structured version Visualization version GIF version |
Description: Multiplying by a negative number, swaps the order. (Contributed by Glauco Siliprandi, 26-Jun-2021.) |
Ref | Expression |
---|---|
ltmulneg.a | ⊢ (𝜑 → 𝐴 ∈ ℝ) |
ltmulneg.b | ⊢ (𝜑 → 𝐵 ∈ ℝ) |
ltmulneg.c | ⊢ (𝜑 → 𝐶 ∈ ℝ) |
ltmulneg.n | ⊢ (𝜑 → 𝐶 < 0) |
Ref | Expression |
---|---|
ltmulneg | ⊢ (𝜑 → (𝐴 < 𝐵 ↔ (𝐵 · 𝐶) < (𝐴 · 𝐶))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ltmulneg.a | . . 3 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
2 | ltmulneg.b | . . 3 ⊢ (𝜑 → 𝐵 ∈ ℝ) | |
3 | ltmulneg.c | . . . 4 ⊢ (𝜑 → 𝐶 ∈ ℝ) | |
4 | ltmulneg.n | . . . 4 ⊢ (𝜑 → 𝐶 < 0) | |
5 | 3, 4 | negelrpd 13066 | . . 3 ⊢ (𝜑 → -𝐶 ∈ ℝ+) |
6 | 1, 2, 5 | ltmul1d 13115 | . 2 ⊢ (𝜑 → (𝐴 < 𝐵 ↔ (𝐴 · -𝐶) < (𝐵 · -𝐶))) |
7 | 3 | renegcld 11687 | . . . 4 ⊢ (𝜑 → -𝐶 ∈ ℝ) |
8 | 1, 7 | remulcld 11288 | . . 3 ⊢ (𝜑 → (𝐴 · -𝐶) ∈ ℝ) |
9 | 2, 7 | remulcld 11288 | . . 3 ⊢ (𝜑 → (𝐵 · -𝐶) ∈ ℝ) |
10 | 8, 9 | ltnegd 11838 | . 2 ⊢ (𝜑 → ((𝐴 · -𝐶) < (𝐵 · -𝐶) ↔ -(𝐵 · -𝐶) < -(𝐴 · -𝐶))) |
11 | 2 | recnd 11286 | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℂ) |
12 | 7 | recnd 11286 | . . . . 5 ⊢ (𝜑 → -𝐶 ∈ ℂ) |
13 | 11, 12 | mulneg2d 11714 | . . . 4 ⊢ (𝜑 → (𝐵 · --𝐶) = -(𝐵 · -𝐶)) |
14 | 3 | recnd 11286 | . . . . . 6 ⊢ (𝜑 → 𝐶 ∈ ℂ) |
15 | 14 | negnegd 11608 | . . . . 5 ⊢ (𝜑 → --𝐶 = 𝐶) |
16 | 15 | oveq2d 7446 | . . . 4 ⊢ (𝜑 → (𝐵 · --𝐶) = (𝐵 · 𝐶)) |
17 | 13, 16 | eqtr3d 2776 | . . 3 ⊢ (𝜑 → -(𝐵 · -𝐶) = (𝐵 · 𝐶)) |
18 | 1 | recnd 11286 | . . . . 5 ⊢ (𝜑 → 𝐴 ∈ ℂ) |
19 | 18, 12 | mulneg2d 11714 | . . . 4 ⊢ (𝜑 → (𝐴 · --𝐶) = -(𝐴 · -𝐶)) |
20 | 15 | oveq2d 7446 | . . . 4 ⊢ (𝜑 → (𝐴 · --𝐶) = (𝐴 · 𝐶)) |
21 | 19, 20 | eqtr3d 2776 | . . 3 ⊢ (𝜑 → -(𝐴 · -𝐶) = (𝐴 · 𝐶)) |
22 | 17, 21 | breq12d 5160 | . 2 ⊢ (𝜑 → (-(𝐵 · -𝐶) < -(𝐴 · -𝐶) ↔ (𝐵 · 𝐶) < (𝐴 · 𝐶))) |
23 | 6, 10, 22 | 3bitrd 305 | 1 ⊢ (𝜑 → (𝐴 < 𝐵 ↔ (𝐵 · 𝐶) < (𝐴 · 𝐶))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 206 ∈ wcel 2105 class class class wbr 5147 (class class class)co 7430 ℝcr 11151 0cc0 11152 · cmul 11157 < clt 11292 -cneg 11490 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1791 ax-4 1805 ax-5 1907 ax-6 1964 ax-7 2004 ax-8 2107 ax-9 2115 ax-10 2138 ax-11 2154 ax-12 2174 ax-ext 2705 ax-sep 5301 ax-nul 5311 ax-pow 5370 ax-pr 5437 ax-un 7753 ax-resscn 11209 ax-1cn 11210 ax-icn 11211 ax-addcl 11212 ax-addrcl 11213 ax-mulcl 11214 ax-mulrcl 11215 ax-mulcom 11216 ax-addass 11217 ax-mulass 11218 ax-distr 11219 ax-i2m1 11220 ax-1ne0 11221 ax-1rid 11222 ax-rnegex 11223 ax-rrecex 11224 ax-cnre 11225 ax-pre-lttri 11226 ax-pre-lttrn 11227 ax-pre-ltadd 11228 ax-pre-mulgt0 11229 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1539 df-fal 1549 df-ex 1776 df-nf 1780 df-sb 2062 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2726 df-clel 2813 df-nfc 2889 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-reu 3378 df-rab 3433 df-v 3479 df-sbc 3791 df-csb 3908 df-dif 3965 df-un 3967 df-in 3969 df-ss 3979 df-nul 4339 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-op 4637 df-uni 4912 df-br 5148 df-opab 5210 df-mpt 5231 df-id 5582 df-po 5596 df-so 5597 df-xp 5694 df-rel 5695 df-cnv 5696 df-co 5697 df-dm 5698 df-rn 5699 df-res 5700 df-ima 5701 df-iota 6515 df-fun 6564 df-fn 6565 df-f 6566 df-f1 6567 df-fo 6568 df-f1o 6569 df-fv 6570 df-riota 7387 df-ov 7433 df-oprab 7434 df-mpo 7435 df-er 8743 df-en 8984 df-dom 8985 df-sdom 8986 df-pnf 11294 df-mnf 11295 df-xr 11296 df-ltxr 11297 df-le 11298 df-sub 11491 df-neg 11492 df-rp 13032 |
This theorem is referenced by: ltdiv23neg 45343 |
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