Theorem btwnlng13 34966

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 484	. . 3 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝐺 ∈ TarskiG)
6		btwnlng13.x	. . . 4 ⊢ (𝜑 → 𝑋 ∈ 𝑃)
7	6	adantr 484	. . 3 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝑋 ∈ 𝑃)
8		btwnlng13.y	. . . 4 ⊢ (𝜑 → 𝑌 ∈ 𝑃)
9	8	adantr 484	. . 3 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝑌 ∈ 𝑃)
10		btwnlng13.z	. . . 4 ⊢ (𝜑 → 𝑍 ∈ 𝑃)
11	10	adantr 484	. . 3 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝑍 ∈ 𝑃)
12		btwnlng13.d	. . . 4 ⊢ (𝜑 → 𝑋 ≠ 𝑌)
13	12	adantr 484	. . 3 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝑋 ≠ 𝑌)
14		simpr 488	. . 3 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝑍 ∈ (𝑋𝐼𝑌))
15	1, 2, 3, 5, 7, 9, 11, 13, 14	btwnlng1 28790	. 2 ⊢ ((𝜑 ∧ 𝑍 ∈ (𝑋𝐼𝑌)) → 𝑍 ∈ (𝑋𝐿𝑌))
16	4	adantr 484	. . 3 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝐺 ∈ TarskiG)
17	6	adantr 484	. . 3 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝑋 ∈ 𝑃)
18	8	adantr 484	. . 3 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝑌 ∈ 𝑃)
19	10	adantr 484	. . 3 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝑍 ∈ 𝑃)
20	12	adantr 484	. . 3 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝑋 ≠ 𝑌)
21		simpr 488	. . 3 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝑌 ∈ (𝑋𝐼𝑍))
22	1, 2, 3, 16, 17, 18, 19, 20, 21	btwnlng3 28792	. 2 ⊢ ((𝜑 ∧ 𝑌 ∈ (𝑋𝐼𝑍)) → 𝑍 ∈ (𝑋𝐿𝑌))
23		btwnlng13.1	. 2 ⊢ (𝜑 → (𝑍 ∈ (𝑋𝐼𝑌) ∨ 𝑌 ∈ (𝑋𝐼𝑍)))
24	15, 22, 23	mpjaodan 971	1 ⊢ (𝜑 → 𝑍 ∈ (𝑋𝐿𝑌))

Syntax hints:   → wi 4   ∧ wa 399   ∨ wo 858   = wceq 1562   ∈ wcel 2144   ≠ wne 2959  ‘cfv 6523  (class class class)co 7398  Basecbs 17247  TarskiGcstrkg 28598  Itvcitv 28604  LineGclng 28605

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1817  ax-4 1831  ax-5 1932  ax-6 1989  ax-7 2030  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2214  ax-ext 2736  ax-sep 5248  ax-nul 5258  ax-pr 5392

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3or 1100  df-3an 1101  df-tru 1565  df-fal 1575  df-ex 1802  df-nf 1806  df-sb 2093  df-mo 2568  df-eu 2598  df-clab 2743  df-cleq 2756  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3079  df-rex 3089  df-rab 3417  df-v 3458  df-sbc 3747  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5103  df-opab 5165  df-id 5544  df-xp 5655  df-rel 5656  df-cnv 5657  df-co 5658  df-dm 5659  df-iota 6479  df-fun 6525  df-fv 6531  df-ov 7401  df-oprab 7402  df-mpo 7403  df-trkg 28624

This theorem is referenced by:  morleylemrneab  34967