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Theorem btwnlng3 29119
Description: Betweenness implies colinearity. (Contributed by Thierry Arnoux, 28-Mar-2019.)
Hypotheses
Ref Expression
btwnlng1.p 𝑃 = (Base‘𝐺)
btwnlng1.i 𝐼 = (Itv‘𝐺)
btwnlng1.l 𝐿 = (LineG‘𝐺)
btwnlng1.g (𝜑 → 𝐺 ∈ TarskiG)
btwnlng1.x (𝜑 → 𝑋 ∈ 𝑃)
btwnlng1.y (𝜑 → 𝑌 ∈ 𝑃)
btwnlng1.z (𝜑 → 𝑍 ∈ 𝑃)
btwnlng1.d (𝜑 → 𝑋 ≠ 𝑌)
btwnlng3.1 (𝜑 → 𝑌 ∈ (𝑋𝐼𝑍))
Assertion
Ref Expression
btwnlng3 (𝜑 → 𝑍 ∈ (𝑋𝐿𝑌))

Proof of Theorem btwnlng3
StepHypRef Expression
1 btwnlng3.1 . . 3 (𝜑 → 𝑌 ∈ (𝑋𝐼𝑍))
213mix3d 1357 . 2 (𝜑 → (𝑍 ∈ (𝑋𝐼𝑌) ∨ 𝑋 ∈ (𝑍𝐼𝑌) ∨ 𝑌 ∈ (𝑋𝐼𝑍)))
3 btwnlng1.p . . 3 𝑃 = (Base‘𝐺)
4 btwnlng1.l . . 3 𝐿 = (LineG‘𝐺)
5 btwnlng1.i . . 3 𝐼 = (Itv‘𝐺)
6 btwnlng1.g . . 3 (𝜑 → 𝐺 ∈ TarskiG)
7 btwnlng1.x . . 3 (𝜑 → 𝑋 ∈ 𝑃)
8 btwnlng1.y . . 3 (𝜑 → 𝑌 ∈ 𝑃)
9 btwnlng1.d . . 3 (𝜑 → 𝑋 ≠ 𝑌)
10 btwnlng1.z . . 3 (𝜑 → 𝑍 ∈ 𝑃)
113, 4, 5, 6, 7, 8, 9, 10tgellng 29046 . 2 (𝜑 → (𝑍 ∈ (𝑋𝐿𝑌) ↔ (𝑍 ∈ (𝑋𝐼𝑌) ∨ 𝑋 ∈ (𝑍𝐼𝑌) ∨ 𝑌 ∈ (𝑋𝐼𝑍))))
122, 11mpbird 260 1 (𝜑 → 𝑍 ∈ (𝑋𝐿𝑌))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∨ w3o 1102   = wceq 1570   ∈ wcel 2147   ≠ wne 2959  ‘cfv 6558  (class class class)co 7443  Basecbs 17416  TarskiGcstrkg 28919  Itvcitv 28925  LineGclng 28926
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-sep 5252  ax-nul 5263  ax-pr 5395
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-sbc 3743  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5171  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-iota 6512  df-fun 6560  df-fv 6566  df-ov 7446  df-oprab 7447  df-mpo 7448  df-trkg 28945
This theorem is used by:  midexlem  29194  footexALT  29223  footexlem1  29224  footexlem2  29225  mideulem2  29240  opphllem1  29253  outpasch  29263  colhp  29278  plngrotlem1  29295  plngrotlem2  29296  prlngmolem1  29460  btwnlng13  35369  morleylemrneab  35370
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