Theorem tglngne 26336

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 7159	. . . . . 6 ⊢ (𝑋𝐿𝑌) = (𝐿‘⟨𝑋, 𝑌⟩)
3	1, 2	eleqtrdi 2923	. . . . 5 ⊢ (𝜑 → 𝑍 ∈ (𝐿‘⟨𝑋, 𝑌⟩))
4		elfvdm 6702	. . . . 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 26333	. . . . 5 ⊢ (𝐺 ∈ TarskiG → 𝐿 Fn ((𝑃 × 𝑃) ∖ I ))
11		fndm 6455	. . . . 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 2915	. . 3 ⊢ (𝜑 → ⟨𝑋, 𝑌⟩ ∈ ((𝑃 × 𝑃) ∖ I ))
14	13	eldifbd 3949	. 2 ⊢ (𝜑 → ¬ ⟨𝑋, 𝑌⟩ ∈ I )
15		df-br 5067	. . . 4 ⊢ (𝑋 I 𝑌 ↔ ⟨𝑋, 𝑌⟩ ∈ I )
16		tglngval.y	. . . . 5 ⊢ (𝜑 → 𝑌 ∈ 𝑃)
17		ideqg 5722	. . . . 5 ⊢ (𝑌 ∈ 𝑃 → (𝑋 I 𝑌 ↔ 𝑋 = 𝑌))
18	16, 17	syl 17	. . . 4 ⊢ (𝜑 → (𝑋 I 𝑌 ↔ 𝑋 = 𝑌))
19	15, 18	syl5bbr 287	. . 3 ⊢ (𝜑 → (⟨𝑋, 𝑌⟩ ∈ I ↔ 𝑋 = 𝑌))
20	19	necon3bbid 3053	. 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 1537   ∈ wcel 2114   ≠ wne 3016   ∖ cdif 3933  ⟨cop 4573   class class class wbr 5066   I cid 5459   × cxp 5553  dom cdm 5555   Fn wfn 6350  ‘cfv 6355  (class class class)co 7156  Basecbs 16483  TarskiGcstrkg 26216  Itvcitv 26222  LineGclng 26223

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4839  df-iun 4921  df-br 5067  df-opab 5129  df-mpt 5147  df-id 5460  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-iota 6314  df-fun 6357  df-fn 6358  df-f 6359  df-fv 6363  df-ov 7159  df-oprab 7160  df-mpo 7161  df-1st 7689  df-2nd 7690  df-trkg 26239

This theorem is referenced by:  lnhl  26401  tglnne  26414  tglineneq  26430  tglineinteq  26431  ncolncol  26432  coltr  26433  coltr3  26434  perprag  26512