Theorem tglngne 28721

Description: It takes two different points to form a line. (Contributed by Thierry Arnoux, 6-Aug-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)
tglngne.1	⊢ (𝜑 → 𝑍 ∈ (𝑋𝐿𝑌))

Assertion

Ref	Expression
tglngne	⊢ (𝜑 → 𝑋 ≠ 𝑌)

Proof of Theorem tglngne

Step	Hyp	Ref	Expression
1		tglngne.1	. . . . . 6 ⊢ (𝜑 → 𝑍 ∈ (𝑋𝐿𝑌))
2		df-ov 7401	. . . . . 6 ⊢ (𝑋𝐿𝑌) = (𝐿‘⟨𝑋, 𝑌⟩)
3	1, 2	eleqtrdi 2874	. . . . 5 ⊢ (𝜑 → 𝑍 ∈ (𝐿‘⟨𝑋, 𝑌⟩))
4		elfvdm 6903	. . . . 5 ⊢ (𝑍 ∈ (𝐿‘⟨𝑋, 𝑌⟩) → ⟨𝑋, 𝑌⟩ ∈ dom 𝐿)
5	3, 4	syl 17	. . . 4 ⊢ (𝜑 → ⟨𝑋, 𝑌⟩ ∈ dom 𝐿)
6		tglngval.g	. . . . 5 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
7		tglngval.p	. . . . . 6 ⊢ 𝑃 = (Base‘𝐺)
8		tglngval.l	. . . . . 6 ⊢ 𝐿 = (LineG‘𝐺)
9		tglngval.i	. . . . . 6 ⊢ 𝐼 = (Itv‘𝐺)
10	7, 8, 9	tglnfn 28718	. . . . 5 ⊢ (𝐺 ∈ TarskiG → 𝐿 Fn ((𝑃 × 𝑃) ∖ I ))
11		fndm 6626	. . . . 5 ⊢ (𝐿 Fn ((𝑃 × 𝑃) ∖ I ) → dom 𝐿 = ((𝑃 × 𝑃) ∖ I ))
12	6, 10, 11	3syl 18	. . . 4 ⊢ (𝜑 → dom 𝐿 = ((𝑃 × 𝑃) ∖ I ))
13	5, 12	eleqtrd 2866	. . 3 ⊢ (𝜑 → ⟨𝑋, 𝑌⟩ ∈ ((𝑃 × 𝑃) ∖ I ))
14	13	eldifbd 3919	. 2 ⊢ (𝜑 → ¬ ⟨𝑋, 𝑌⟩ ∈ I )
15		df-br 5103	. . . 4 ⊢ (𝑋 I 𝑌 ↔ ⟨𝑋, 𝑌⟩ ∈ I )
16		tglngval.y	. . . . 5 ⊢ (𝜑 → 𝑌 ∈ 𝑃)
17		ideqg 5825	. . . . 5 ⊢ (𝑌 ∈ 𝑃 → (𝑋 I 𝑌 ↔ 𝑋 = 𝑌))
18	16, 17	syl 17	. . . 4 ⊢ (𝜑 → (𝑋 I 𝑌 ↔ 𝑋 = 𝑌))
19	15, 18	bitr3id 287	. . 3 ⊢ (𝜑 → (⟨𝑋, 𝑌⟩ ∈ I ↔ 𝑋 = 𝑌))
20	19	necon3bbid 2996	. 2 ⊢ (𝜑 → (¬ ⟨𝑋, 𝑌⟩ ∈ I ↔ 𝑋 ≠ 𝑌))
21	14, 20	mpbid 234	1 ⊢ (𝜑 → 𝑋 ≠ 𝑌)

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 208   = wceq 1562   ∈ wcel 2144   ≠ wne 2959   ∖ cdif 3903  ⟨cop 4590   class class class wbr 5102   I cid 5543   × cxp 5647  dom cdm 5649   Fn wfn 6518  ‘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  ax-un 7720

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-csb 3855  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-iun 4953  df-br 5103  df-opab 5165  df-mpt 5184  df-id 5544  df-xp 5655  df-rel 5656  df-cnv 5657  df-co 5658  df-dm 5659  df-rn 5660  df-res 5661  df-ima 5662  df-iota 6479  df-fun 6525  df-fn 6526  df-f 6527  df-fv 6531  df-ov 7401  df-oprab 7402  df-mpo 7403  df-1st 7972  df-2nd 7973  df-trkg 28624

This theorem is referenced by:  lnhl  28786  tglnne  28799  tglineneq  28816  tglineinteq  28817  ncolncol  28818  coltr  28819  coltr3  28820  perprag  28901