Theorem btwnlng13 34866

Description: If 𝑍 is between 𝑋 and 𝑌, or 𝑌 is between 𝑋 and 𝑍, then 𝑍 lies on the line 𝑋𝑌. (Contributed by SS, 4-Jun-2026.)

Hypotheses

Ref	Expression
btwnlng13.p	⊢ 𝑃 = (Base‘𝐺)
btwnlng13.i	⊢ 𝐼 = (Itv‘𝐺)
btwnlng13.l	⊢ 𝐿 = (LineG‘𝐺)
btwnlng13.g	⊢ (𝜑 → 𝐺 ∈ TarskiG)
btwnlng13.x	⊢ (𝜑 → 𝑋 ∈ 𝑃)
btwnlng13.y	⊢ (𝜑 → 𝑌 ∈ 𝑃)
btwnlng13.z	⊢ (𝜑 → 𝑍 ∈ 𝑃)
btwnlng13.d	⊢ (𝜑 → 𝑋 ≠ 𝑌)
btwnlng13.1	⊢ (𝜑 → (𝑍 ∈ (𝑋𝐼𝑌) ∨ 𝑌 ∈ (𝑋𝐼𝑍)))

Assertion

Ref	Expression
btwnlng13	⊢ (𝜑 → 𝑍 ∈ (𝑋𝐿𝑌))

Proof of Theorem btwnlng13

Step	Hyp	Ref	Expression
1		btwnlng13.p	. . 3 ⊢ 𝑃 = (Base‘𝐺)
2		btwnlng13.i	. . 3 ⊢ 𝐼 = (Itv‘𝐺)
3		btwnlng13.l	. . 3 ⊢ 𝐿 = (LineG‘𝐺)
4		btwnlng13.g	. . . 4 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
5	4	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝐺 ∈ TarskiG)
6		btwnlng13.x	. . . 4 ⊢ (𝜑 → 𝑋 ∈ 𝑃)
7	6	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝑋 ∈ 𝑃)
8		btwnlng13.y	. . . 4 ⊢ (𝜑 → 𝑌 ∈ 𝑃)
9	8	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝑌 ∈ 𝑃)
10		btwnlng13.z	. . . 4 ⊢ (𝜑 → 𝑍 ∈ 𝑃)
11	10	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝑍 ∈ 𝑃)
12		btwnlng13.d	. . . 4 ⊢ (𝜑 → 𝑋 ≠ 𝑌)
13	12	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝑋 ≠ 𝑌)
14		simpr 486	. . 3 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝑍 ∈ (𝑋𝐼𝑌))
15	1, 2, 3, 5, 7, 9, 11, 13, 14	btwnlng1 28709	. 2 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝑍 ∈ (𝑋𝐿𝑌))
16	4	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝐺 ∈ TarskiG)
17	6	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝑋 ∈ 𝑃)
18	8	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝑌 ∈ 𝑃)
19	10	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝑍 ∈ 𝑃)
20	12	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝑋 ≠ 𝑌)
21		simpr 486	. . 3 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝑌 ∈ (𝑋𝐼𝑍))
22	1, 2, 3, 16, 17, 18, 19, 20, 21	btwnlng3 28711	. 2 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝑍 ∈ (𝑋𝐿𝑌))
23		btwnlng13.1	. 2 ⊢ (𝜑 → (𝑍 ∈ (𝑋𝐼𝑌) ∨ 𝑌 ∈ (𝑋𝐼𝑍)))
24	15, 22, 23	mpjaodan 967	1 ⊢ (𝜑 → 𝑍 ∈ (𝑋𝐿𝑌))

Syntax hints:   → wi 4   ∧ wa 397   ∨ wo 854   = wceq 1548   ∈ wcel 2121   ≠ wne 2936  ‘cfv 6489  (class class class)co 7360  Basecbs 17174  TarskiGcstrkg 28517  Itvcitv 28523  LineGclng 28524

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1975  ax-7 2016  ax-8 2123  ax-9 2131  ax-10 2154  ax-11 2170  ax-12 2191  ax-ext 2713  ax-sep 5221  ax-nul 5231  ax-pr 5365

This theorem depends on definitions:  df-bi 209  df-an 398  df-or 855  df-3or 1094  df-3an 1095  df-tru 1551  df-fal 1561  df-ex 1788  df-nf 1792  df-sb 2075  df-mo 2545  df-eu 2575  df-clab 2720  df-cleq 2733  df-clel 2816  df-nfc 2890  df-ne 2937  df-ral 3056  df-rex 3066  df-rab 3394  df-v 3435  df-sbc 3726  df-dif 3888  df-un 3890  df-in 3892  df-ss 3902  df-nul 4265  df-if 4458  df-pw 4534  df-sn 4559  df-pr 4561  df-op 4565  df-uni 4842  df-br 5076  df-opab 5138  df-id 5516  df-xp 5627  df-rel 5628  df-cnv 5629  df-co 5630  df-dm 5631  df-iota 6445  df-fun 6491  df-fv 6497  df-ov 7363  df-oprab 7364  df-mpo 7365  df-trkg 28543

This theorem is referenced by:  morleylemrneab  34867