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Theorem btwncolg1 28375

Description: Betweenness implies colinearity. (Contributed by Thierry Arnoux, 28-Mar-2019.)

**Hypotheses**
Ref	Expression
tglngval.p	⊢ 𝑃 = (Base‘𝐺)
tglngval.l	⊢ 𝐿 = (LineG‘𝐺)
tglngval.i	⊢ 𝐼 = (Itv‘𝐺)
tglngval.g	⊢ (𝜑 → 𝐺 ∈ TarskiG)
tglngval.x	⊢ (𝜑 → 𝑋 ∈ 𝑃)
tglngval.y	⊢ (𝜑 → 𝑌 ∈ 𝑃)
tgcolg.z	⊢ (𝜑 → 𝑍 ∈ 𝑃)
btwncolg1.z	⊢ (𝜑 → 𝑍 ∈ (𝑋𝐼𝑌))

**Assertion**
Ref	Expression
btwncolg1	⊢ (𝜑 → (𝑍 ∈ (𝑋𝐿𝑌) ∨ 𝑋 = 𝑌))

**Proof of Theorem btwncolg1**
Step	Hyp	Ref	Expression
1		btwncolg1.z	. . 3 ⊢ (𝜑 → 𝑍 ∈ (𝑋𝐼𝑌))
2	1	3mix1d 1333	. 2 ⊢ (𝜑 → (𝑍 ∈ (𝑋𝐼𝑌) ∨ 𝑋 ∈ (𝑍𝐼𝑌) ∨ 𝑌 ∈ (𝑋𝐼𝑍)))
3		tglngval.p	. . 3 ⊢ 𝑃 = (Base‘𝐺)
4		tglngval.l	. . 3 ⊢ 𝐿 = (LineG‘𝐺)
5		tglngval.i	. . 3 ⊢ 𝐼 = (Itv‘𝐺)
6		tglngval.g	. . 3 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
7		tglngval.x	. . 3 ⊢ (𝜑 → 𝑋 ∈ 𝑃)
8		tglngval.y	. . 3 ⊢ (𝜑 → 𝑌 ∈ 𝑃)
9		tgcolg.z	. . 3 ⊢ (𝜑 → 𝑍 ∈ 𝑃)
10	3, 4, 5, 6, 7, 8, 9	tgcolg 28374	. 2 ⊢ (𝜑 → ((𝑍 ∈ (𝑋𝐿𝑌) ∨ 𝑋 = 𝑌) ↔ (𝑍 ∈ (𝑋𝐼𝑌) ∨ 𝑋 ∈ (𝑍𝐼𝑌) ∨ 𝑌 ∈ (𝑋𝐼𝑍))))
11	2, 10	mpbird 256	1 ⊢ (𝜑 → (𝑍 ∈ (𝑋𝐿𝑌) ∨ 𝑋 = 𝑌))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∨ wo 845 ∨ w3o 1083 = wceq 1533 ∈ wcel 2098 ‘cfv 6541 (class class class)co 7414 Basecbs 17177 TarskiGcstrkg 28247 Itvcitv 28253 LineGclng 28254

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-sep 5292 ax-nul 5299 ax-pr 5421

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-ral 3052 df-rex 3061 df-rab 3420 df-v 3465 df-sbc 3769 df-dif 3942 df-un 3944 df-in 3946 df-ss 3956 df-nul 4317 df-if 4523 df-sn 4623 df-pr 4625 df-op 4629 df-uni 4902 df-br 5142 df-opab 5204 df-id 5568 df-xp 5676 df-rel 5677 df-cnv 5678 df-co 5679 df-dm 5680 df-iota 6493 df-fun 6543 df-fv 6549 df-ov 7417 df-oprab 7418 df-mpo 7419 df-trkgc 28268 df-trkgcb 28270 df-trkg 28273

This theorem is referenced by: tgdim01ln 28384 lnxfr 28386 tgbtwnconn1lem3 28394 tgbtwnconnln3 28398 legov2 28406 ncolne1 28445 tglineeltr 28451 mirtrcgr 28503 symquadlem 28509 midexlem 28512 ragflat 28524 colperpexlem1 28550 opphllem 28555

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