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Theorem btwnlng3 29090
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 29017 . 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 2145   ≠ wne 2956  ‘cfv 6539  (class class class)co 7421  Basecbs 17388  TarskiGcstrkg 28890  Itvcitv 28896  LineGclng 28897
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 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-nul 5260  ax-pr 5391
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 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-sbc 3740  df-dif 3900  df-un 3902  df-in 3904  df-ss 3915  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-iota 6495  df-fun 6541  df-fv 6547  df-ov 7424  df-oprab 7425  df-mpo 7426  df-trkg 28916
This theorem is used by:  midexlem  29165  footexALT  29194  footexlem1  29195  footexlem2  29196  mideulem2  29211  opphllem1  29224  outpasch  29234  colhp  29249  plngrotlem1  29266  plngrotlem2  29267  prlngmolem1  29431  btwnlng13  35300  morleylemrneab  35301
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