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Theorem btwncolg1 28578

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 1335	. 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 28577	. 2 ⊢ (𝜑 → ((𝑍 ∈ (𝑋𝐿𝑌) ∨ 𝑋 = 𝑌) ↔ (𝑍 ∈ (𝑋𝐼𝑌) ∨ 𝑋 ∈ (𝑍𝐼𝑌) ∨ 𝑌 ∈ (𝑋𝐼𝑍))))
11	2, 10	mpbird 257	1 ⊢ (𝜑 → (𝑍 ∈ (𝑋𝐿𝑌) ∨ 𝑋 = 𝑌))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∨ wo 847 ∨ w3o 1085 = wceq 1537 ∈ wcel 2106 ‘cfv 6563 (class class class)co 7431 Basecbs 17245 TarskiGcstrkg 28450 Itvcitv 28456 LineGclng 28457

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-pr 5438

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-ral 3060 df-rex 3069 df-rab 3434 df-v 3480 df-sbc 3792 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-id 5583 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-iota 6516 df-fun 6565 df-fv 6571 df-ov 7434 df-oprab 7435 df-mpo 7436 df-trkgc 28471 df-trkgcb 28473 df-trkg 28476

This theorem is referenced by: tgdim01ln 28587 lnxfr 28589 tgbtwnconn1lem3 28597 tgbtwnconnln3 28601 legov2 28609 ncolne1 28648 tglineeltr 28654 mirtrcgr 28706 symquadlem 28712 midexlem 28715 ragflat 28727 colperpexlem1 28753 opphllem 28758

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