Theorem tghilberti1 29117

Description: There is a line through any two distinct points. Hilbert's axiom I.1 for geometry. (Contributed by Thierry Arnoux, 25-May-2019.)

Hypotheses

Ref	Expression
tglineelsb2.p	⊢ 𝐵 = (Base‘𝐺)
tglineelsb2.i	⊢ 𝐼 = (Itv‘𝐺)
tglineelsb2.l	⊢ 𝐿 = (LineG‘𝐺)
tglineelsb2.g	⊢ (𝜑 → 𝐺 ∈ TarskiG)
tglineelsb2.1	⊢ (𝜑 → 𝑃 ∈ 𝐵)
tglineelsb2.2	⊢ (𝜑 → 𝑄 ∈ 𝐵)
tglineelsb2.4	⊢ (𝜑 → 𝑃 ≠ 𝑄)

Assertion

Ref	Expression
tghilberti1	⊢ (𝜑 → ∃𝑥 ∈ ran 𝐿(𝑃 ∈ 𝑥 ∧ 𝑄 ∈ 𝑥))

Distinct variable groups:   𝑥,𝐵   𝑥,𝐺   𝑥,𝐼   𝑥,𝐿   𝑥,𝑃   𝑥,𝑄   𝜑,𝑥

Proof of Theorem tghilberti1

Step	Hyp	Ref	Expression
1		tglineelsb2.p	. . 3 ⊢ 𝐵 = (Base‘𝐺)
2		tglineelsb2.i	. . 3 ⊢ 𝐼 = (Itv‘𝐺)
3		tglineelsb2.l	. . 3 ⊢ 𝐿 = (LineG‘𝐺)
4		tglineelsb2.g	. . 3 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
5		tglineelsb2.1	. . 3 ⊢ (𝜑 → 𝑃 ∈ 𝐵)
6		tglineelsb2.2	. . 3 ⊢ (𝜑 → 𝑄 ∈ 𝐵)
7		tglineelsb2.4	. . 3 ⊢ (𝜑 → 𝑃 ≠ 𝑄)
8	1, 2, 3, 4, 5, 6, 7	tgelrnln 29110	. 2 ⊢ (𝜑 → (𝑃𝐿𝑄) ∈ ran 𝐿)
9	1, 2, 3, 4, 5, 6, 7	tglinerflx1 29113	. 2 ⊢ (𝜑 → 𝑃 ∈ (𝑃𝐿𝑄))
10	1, 2, 3, 4, 5, 6, 7	tglinerflx2 29114	. 2 ⊢ (𝜑 → 𝑄 ∈ (𝑃𝐿𝑄))
11		eleq2 2852	. . . 4 ⊢ (𝑥 = (𝑃𝐿𝑄) → (𝑃 ∈ 𝑥 ↔ 𝑃 ∈ (𝑃𝐿𝑄)))
12		eleq2 2852	. . . 4 ⊢ (𝑥 = (𝑃𝐿𝑄) → (𝑄 ∈ 𝑥 ↔ 𝑄 ∈ (𝑃𝐿𝑄)))
13	11, 12	anbi12d 644	. . 3 ⊢ (𝑥 = (𝑃𝐿𝑄) → ((𝑃 ∈ 𝑥 ∧ 𝑄 ∈ 𝑥) ↔ (𝑃 ∈ (𝑃𝐿𝑄) ∧ 𝑄 ∈ (𝑃𝐿𝑄))))
14	13	rspcev 3579	. 2 ⊢ (((𝑃𝐿𝑄) ∈ ran 𝐿 ∧ (𝑃 ∈ (𝑃𝐿𝑄) ∧ 𝑄 ∈ (𝑃𝐿𝑄))) → ∃𝑥 ∈ ran 𝐿(𝑃 ∈ 𝑥 ∧ 𝑄 ∈ 𝑥))
15	8, 9, 10, 14	syl12anc 850	1 ⊢ (𝜑 → ∃𝑥 ∈ ran 𝐿(𝑃 ∈ 𝑥 ∧ 𝑄 ∈ 𝑥))

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1569   ∈ wcel 2146   ≠ wne 2958  ∃wrex 3089  ran crn 5655  ‘cfv 6546  (class class class)co 7427  Basecbs 17399  TarskiGcstrkg 28901  Itvcitv 28907  LineGclng 28908

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1944  ax-6 2001  ax-7 2042  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2196  ax-12 2215  ax-ext 2735  ax-sep 5251  ax-nul 5262  ax-pr 5394  ax-un 7758

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2101  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3416  df-v 3455  df-sbc 3742  df-csb 3851  df-ss 3900  df-dif 4049  df-in 4093  df-un 4153  df-nul 4281  df-if 4485  df-pw 4561  df-sn 4588  df-pr 4590  df-op 4838  df-uni 4870  df-iun 4955  df-br 5106  df-opab 5170  df-mpt 5189  df-id 5549  df-xp 5660  df-rel 5661  df-cnv 5662  df-co 5663  df-dm 5664  df-rn 5665  df-res 5666  df-ima 5667  df-iota 6500  df-fun 6548  df-fn 6549  df-f 6550  df-fv 6554  df-ov 7430  df-oprab 7431  df-mpo 7432  df-1st 8008  df-2nd 8009  df-trkgc 28922  df-trkgb 28923  df-trkgcb 28924  df-trkg 28927

This theorem is used by:  tglinethrueu  29119