Theorem tglngne 28640

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 7373	. . . . . 6 ⊢ (𝑋𝐿𝑌) = (𝐿‘⟨𝑋, 𝑌⟩)
3	1, 2	eleqtrdi 2847	. . . . 5 ⊢ (𝜑 → 𝑍 ∈ (𝐿‘⟨𝑋, 𝑌⟩))
4		elfvdm 6878	. . . . 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 28637	. . . . 5 ⊢ (𝐺 ∈ TarskiG → 𝐿 Fn ((𝑃 × 𝑃) ∖ I ))
11		fndm 6605	. . . . 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 2839	. . 3 ⊢ (𝜑 → ⟨𝑋, 𝑌⟩ ∈ ((𝑃 × 𝑃) ∖ I ))
14	13	eldifbd 3916	. 2 ⊢ (𝜑 → ¬ ⟨𝑋, 𝑌⟩ ∈ I )
15		df-br 5101	. . . 4 ⊢ (𝑋 I 𝑌 ↔ ⟨𝑋, 𝑌⟩ ∈ I )
16		tglngval.y	. . . . 5 ⊢ (𝜑 → 𝑌 ∈ 𝑃)
17		ideqg 5810	. . . . 5 ⊢ (𝑌 ∈ 𝑃 → (𝑋 I 𝑌 ↔ 𝑋 = 𝑌))
18	16, 17	syl 17	. . . 4 ⊢ (𝜑 → (𝑋 I 𝑌 ↔ 𝑋 = 𝑌))
19	15, 18	bitr3id 285	. . 3 ⊢ (𝜑 → (⟨𝑋, 𝑌⟩ ∈ I ↔ 𝑋 = 𝑌))
20	19	necon3bbid 2970	. 2 ⊢ (𝜑 → (¬ ⟨𝑋, 𝑌⟩ ∈ I ↔ 𝑋 ≠ 𝑌))
21	14, 20	mpbid 232	1 ⊢ (𝜑 → 𝑋 ≠ 𝑌)

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 206   = wceq 1542   ∈ wcel 2114   ≠ wne 2933   ∖ cdif 3900  ⟨cop 4588   class class class wbr 5100   I cid 5528   × cxp 5632  dom cdm 5634   Fn wfn 6497  ‘cfv 6502  (class class class)co 7370  Basecbs 17150  TarskiGcstrkg 28516  Itvcitv 28522  LineGclng 28523

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5245  ax-nul 5255  ax-pr 5381  ax-un 7692

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3402  df-v 3444  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-pw 4558  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-iun 4950  df-br 5101  df-opab 5163  df-mpt 5182  df-id 5529  df-xp 5640  df-rel 5641  df-cnv 5642  df-co 5643  df-dm 5644  df-rn 5645  df-res 5646  df-ima 5647  df-iota 6458  df-fun 6504  df-fn 6505  df-f 6506  df-fv 6510  df-ov 7373  df-oprab 7374  df-mpo 7375  df-1st 7945  df-2nd 7946  df-trkg 28542

This theorem is referenced by:  lnhl  28705  tglnne  28718  tglineneq  28734  tglineinteq  28735  ncolncol  28736  coltr  28737  coltr3  28738  perprag  28816