Mathbox for Saveliy Skresanov |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > sigardiv | Structured version Visualization version GIF version |
Description: If signed area between vectors 𝐵 − 𝐴 and 𝐶 − 𝐴 is zero, then those vectors lie on the same line. (Contributed by Saveliy Skresanov, 22-Sep-2017.) |
Ref | Expression |
---|---|
sigar | ⊢ 𝐺 = (𝑥 ∈ ℂ, 𝑦 ∈ ℂ ↦ (ℑ‘((∗‘𝑥) · 𝑦))) |
sigardiv.a | ⊢ (𝜑 → (𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ)) |
sigardiv.b | ⊢ (𝜑 → ¬ 𝐶 = 𝐴) |
sigardiv.c | ⊢ (𝜑 → ((𝐵 − 𝐴)𝐺(𝐶 − 𝐴)) = 0) |
Ref | Expression |
---|---|
sigardiv | ⊢ (𝜑 → ((𝐵 − 𝐴) / (𝐶 − 𝐴)) ∈ ℝ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sigardiv.a | . . . . . . . 8 ⊢ (𝜑 → (𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ)) | |
2 | 1 | simp2d 1139 | . . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ ℂ) |
3 | 1 | simp1d 1138 | . . . . . . 7 ⊢ (𝜑 → 𝐴 ∈ ℂ) |
4 | 2, 3 | subcld 10991 | . . . . . 6 ⊢ (𝜑 → (𝐵 − 𝐴) ∈ ℂ) |
5 | 1 | simp3d 1140 | . . . . . . 7 ⊢ (𝜑 → 𝐶 ∈ ℂ) |
6 | 5, 3 | subcld 10991 | . . . . . 6 ⊢ (𝜑 → (𝐶 − 𝐴) ∈ ℂ) |
7 | sigardiv.b | . . . . . . . 8 ⊢ (𝜑 → ¬ 𝐶 = 𝐴) | |
8 | 7 | neqned 3023 | . . . . . . 7 ⊢ (𝜑 → 𝐶 ≠ 𝐴) |
9 | 5, 3, 8 | subne0d 11000 | . . . . . 6 ⊢ (𝜑 → (𝐶 − 𝐴) ≠ 0) |
10 | 4, 6, 9 | cjdivd 14576 | . . . . 5 ⊢ (𝜑 → (∗‘((𝐵 − 𝐴) / (𝐶 − 𝐴))) = ((∗‘(𝐵 − 𝐴)) / (∗‘(𝐶 − 𝐴)))) |
11 | 4 | cjcld 14549 | . . . . . . 7 ⊢ (𝜑 → (∗‘(𝐵 − 𝐴)) ∈ ℂ) |
12 | 6 | cjcld 14549 | . . . . . . 7 ⊢ (𝜑 → (∗‘(𝐶 − 𝐴)) ∈ ℂ) |
13 | 6, 9 | cjne0d 14556 | . . . . . . 7 ⊢ (𝜑 → (∗‘(𝐶 − 𝐴)) ≠ 0) |
14 | 11, 12, 6, 13, 9 | divcan5rd 11437 | . . . . . 6 ⊢ (𝜑 → (((∗‘(𝐵 − 𝐴)) · (𝐶 − 𝐴)) / ((∗‘(𝐶 − 𝐴)) · (𝐶 − 𝐴))) = ((∗‘(𝐵 − 𝐴)) / (∗‘(𝐶 − 𝐴)))) |
15 | 11, 6 | mulcld 10655 | . . . . . . . 8 ⊢ (𝜑 → ((∗‘(𝐵 − 𝐴)) · (𝐶 − 𝐴)) ∈ ℂ) |
16 | sigar | . . . . . . . . . . 11 ⊢ 𝐺 = (𝑥 ∈ ℂ, 𝑦 ∈ ℂ ↦ (ℑ‘((∗‘𝑥) · 𝑦))) | |
17 | 16 | sigarval 43101 | . . . . . . . . . 10 ⊢ (((𝐵 − 𝐴) ∈ ℂ ∧ (𝐶 − 𝐴) ∈ ℂ) → ((𝐵 − 𝐴)𝐺(𝐶 − 𝐴)) = (ℑ‘((∗‘(𝐵 − 𝐴)) · (𝐶 − 𝐴)))) |
18 | 4, 6, 17 | syl2anc 586 | . . . . . . . . 9 ⊢ (𝜑 → ((𝐵 − 𝐴)𝐺(𝐶 − 𝐴)) = (ℑ‘((∗‘(𝐵 − 𝐴)) · (𝐶 − 𝐴)))) |
19 | sigardiv.c | . . . . . . . . 9 ⊢ (𝜑 → ((𝐵 − 𝐴)𝐺(𝐶 − 𝐴)) = 0) | |
20 | 18, 19 | eqtr3d 2858 | . . . . . . . 8 ⊢ (𝜑 → (ℑ‘((∗‘(𝐵 − 𝐴)) · (𝐶 − 𝐴))) = 0) |
21 | 15, 20 | reim0bd 14553 | . . . . . . 7 ⊢ (𝜑 → ((∗‘(𝐵 − 𝐴)) · (𝐶 − 𝐴)) ∈ ℝ) |
22 | 6, 12 | mulcomd 10656 | . . . . . . . 8 ⊢ (𝜑 → ((𝐶 − 𝐴) · (∗‘(𝐶 − 𝐴))) = ((∗‘(𝐶 − 𝐴)) · (𝐶 − 𝐴))) |
23 | 6 | cjmulrcld 14559 | . . . . . . . 8 ⊢ (𝜑 → ((𝐶 − 𝐴) · (∗‘(𝐶 − 𝐴))) ∈ ℝ) |
24 | 22, 23 | eqeltrrd 2914 | . . . . . . 7 ⊢ (𝜑 → ((∗‘(𝐶 − 𝐴)) · (𝐶 − 𝐴)) ∈ ℝ) |
25 | 12, 6, 13, 9 | mulne0d 11286 | . . . . . . 7 ⊢ (𝜑 → ((∗‘(𝐶 − 𝐴)) · (𝐶 − 𝐴)) ≠ 0) |
26 | 21, 24, 25 | redivcld 11462 | . . . . . 6 ⊢ (𝜑 → (((∗‘(𝐵 − 𝐴)) · (𝐶 − 𝐴)) / ((∗‘(𝐶 − 𝐴)) · (𝐶 − 𝐴))) ∈ ℝ) |
27 | 14, 26 | eqeltrrd 2914 | . . . . 5 ⊢ (𝜑 → ((∗‘(𝐵 − 𝐴)) / (∗‘(𝐶 − 𝐴))) ∈ ℝ) |
28 | 10, 27 | eqeltrd 2913 | . . . 4 ⊢ (𝜑 → (∗‘((𝐵 − 𝐴) / (𝐶 − 𝐴))) ∈ ℝ) |
29 | 28 | cjred 14579 | . . 3 ⊢ (𝜑 → (∗‘(∗‘((𝐵 − 𝐴) / (𝐶 − 𝐴)))) = (∗‘((𝐵 − 𝐴) / (𝐶 − 𝐴)))) |
30 | 4, 6, 9 | divcld 11410 | . . . 4 ⊢ (𝜑 → ((𝐵 − 𝐴) / (𝐶 − 𝐴)) ∈ ℂ) |
31 | 30 | cjcjd 14552 | . . 3 ⊢ (𝜑 → (∗‘(∗‘((𝐵 − 𝐴) / (𝐶 − 𝐴)))) = ((𝐵 − 𝐴) / (𝐶 − 𝐴))) |
32 | 29, 31 | eqtr3d 2858 | . 2 ⊢ (𝜑 → (∗‘((𝐵 − 𝐴) / (𝐶 − 𝐴))) = ((𝐵 − 𝐴) / (𝐶 − 𝐴))) |
33 | 32, 28 | eqeltrrd 2914 | 1 ⊢ (𝜑 → ((𝐵 − 𝐴) / (𝐶 − 𝐴)) ∈ ℝ) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∧ w3a 1083 = wceq 1533 ∈ wcel 2110 ‘cfv 6349 (class class class)co 7150 ∈ cmpo 7152 ℂcc 10529 ℝcr 10530 0cc0 10531 · cmul 10536 − cmin 10864 / cdiv 11291 ∗ccj 14449 ℑcim 14451 |
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 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 ax-resscn 10588 ax-1cn 10589 ax-icn 10590 ax-addcl 10591 ax-addrcl 10592 ax-mulcl 10593 ax-mulrcl 10594 ax-mulcom 10595 ax-addass 10596 ax-mulass 10597 ax-distr 10598 ax-i2m1 10599 ax-1ne0 10600 ax-1rid 10601 ax-rnegex 10602 ax-rrecex 10603 ax-cnre 10604 ax-pre-lttri 10605 ax-pre-lttrn 10606 ax-pre-ltadd 10607 ax-pre-mulgt0 10608 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-op 4567 df-uni 4832 df-br 5059 df-opab 5121 df-mpt 5139 df-id 5454 df-po 5468 df-so 5469 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-ima 5562 df-iota 6308 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 df-fv 6357 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-er 8283 df-en 8504 df-dom 8505 df-sdom 8506 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-div 11292 df-2 11694 df-cj 14452 df-re 14453 df-im 14454 |
This theorem is referenced by: sigarcol 43115 sharhght 43116 |
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