Theorem tglngne 28618

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 7370	. . . . . 6 ⊢ (𝑋𝐿𝑌) = (𝐿‘⟨𝑋, 𝑌⟩)
3	1, 2	eleqtrdi 2846	. . . . 5 ⊢ (𝜑 → 𝑍 ∈ (𝐿‘⟨𝑋, 𝑌⟩))
4		elfvdm 6874	. . . . 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 28615	. . . . 5 ⊢ (𝐺 ∈ TarskiG → 𝐿 Fn ((𝑃 × 𝑃) ∖ I ))
11		fndm 6601	. . . . 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 2838	. . 3 ⊢ (𝜑 → ⟨𝑋, 𝑌⟩ ∈ ((𝑃 × 𝑃) ∖ I ))
14	13	eldifbd 3902	. 2 ⊢ (𝜑 → ¬ ⟨𝑋, 𝑌⟩ ∈ I )
15		df-br 5086	. . . 4 ⊢ (𝑋 I 𝑌 ↔ ⟨𝑋, 𝑌⟩ ∈ I )
16		tglngval.y	. . . . 5 ⊢ (𝜑 → 𝑌 ∈ 𝑃)
17		ideqg 5806	. . . . 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 2969	. 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 2932   ∖ cdif 3886  ⟨cop 4573   class class class wbr 5085   I cid 5525   × cxp 5629  dom cdm 5631   Fn wfn 6493  ‘cfv 6498  (class class class)co 7367  Basecbs 17179  TarskiGcstrkg 28495  Itvcitv 28501  LineGclng 28502

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 2708  ax-sep 5231  ax-nul 5241  ax-pr 5375  ax-un 7689

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 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-rab 3390  df-v 3431  df-sbc 3729  df-csb 3838  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-iun 4935  df-br 5086  df-opab 5148  df-mpt 5167  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-iota 6454  df-fun 6500  df-fn 6501  df-f 6502  df-fv 6506  df-ov 7370  df-oprab 7371  df-mpo 7372  df-1st 7942  df-2nd 7943  df-trkg 28521

This theorem is referenced by:  lnhl  28683  tglnne  28696  tglineneq  28712  tglineinteq  28713  ncolncol  28714  coltr  28715  coltr3  28716  perprag  28794