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Theorem axtgcont1 25348
Description: Axiom of Continuity. Axiom A11 of [Schwabhauser] p. 13. This axiom (scheme) asserts that any two sets 𝑆 and 𝑇 (of points) such that the elements of 𝑆 precede the elements of 𝑇 with respect to some point 𝑎 (that is, 𝑥 is between 𝑎 and 𝑦 whenever 𝑥 is in 𝑋 and 𝑦 is in 𝑌) are separated by some point 𝑏; this is explained in Axiom 11 of [Tarski1999] p. 185. (Contributed by Thierry Arnoux, 16-Mar-2019.)
Hypotheses
Ref Expression
axtrkg.p 𝑃 = (Base‘𝐺)
axtrkg.d = (dist‘𝐺)
axtrkg.i 𝐼 = (Itv‘𝐺)
axtrkg.g (𝜑𝐺 ∈ TarskiG)
axtgcont.1 (𝜑𝑆𝑃)
axtgcont.2 (𝜑𝑇𝑃)
Assertion
Ref Expression
axtgcont1 (𝜑 → (∃𝑎𝑃𝑥𝑆𝑦𝑇 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑆𝑦𝑇 𝑏 ∈ (𝑥𝐼𝑦)))
Distinct variable groups:   𝑥,𝑦   𝑎,𝑏,𝑥,𝑦,𝐼   𝑃,𝑎,𝑏,𝑥,𝑦   𝑆,𝑎,𝑏,𝑥   𝑇,𝑎,𝑏,𝑥,𝑦   ,𝑎,𝑏,𝑥,𝑦
Allowed substitution hints:   𝜑(𝑥,𝑦,𝑎,𝑏)   𝑆(𝑦)   𝐺(𝑥,𝑦,𝑎,𝑏)

Proof of Theorem axtgcont1
Dummy variables 𝑓 𝑖 𝑝 𝑧 𝑣 𝑠 𝑡 𝑢 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-trkg 25333 . . . . 5 TarskiG = ((TarskiGC ∩ TarskiGB) ∩ (TarskiGCB ∩ {𝑓[(Base‘𝑓) / 𝑝][(Itv‘𝑓) / 𝑖](LineG‘𝑓) = (𝑥𝑝, 𝑦 ∈ (𝑝 ∖ {𝑥}) ↦ {𝑧𝑝 ∣ (𝑧 ∈ (𝑥𝑖𝑦) ∨ 𝑥 ∈ (𝑧𝑖𝑦) ∨ 𝑦 ∈ (𝑥𝑖𝑧))})}))
2 inss1 3825 . . . . . 6 ((TarskiGC ∩ TarskiGB) ∩ (TarskiGCB ∩ {𝑓[(Base‘𝑓) / 𝑝][(Itv‘𝑓) / 𝑖](LineG‘𝑓) = (𝑥𝑝, 𝑦 ∈ (𝑝 ∖ {𝑥}) ↦ {𝑧𝑝 ∣ (𝑧 ∈ (𝑥𝑖𝑦) ∨ 𝑥 ∈ (𝑧𝑖𝑦) ∨ 𝑦 ∈ (𝑥𝑖𝑧))})})) ⊆ (TarskiGC ∩ TarskiGB)
3 inss2 3826 . . . . . 6 (TarskiGC ∩ TarskiGB) ⊆ TarskiGB
42, 3sstri 3604 . . . . 5 ((TarskiGC ∩ TarskiGB) ∩ (TarskiGCB ∩ {𝑓[(Base‘𝑓) / 𝑝][(Itv‘𝑓) / 𝑖](LineG‘𝑓) = (𝑥𝑝, 𝑦 ∈ (𝑝 ∖ {𝑥}) ↦ {𝑧𝑝 ∣ (𝑧 ∈ (𝑥𝑖𝑦) ∨ 𝑥 ∈ (𝑧𝑖𝑦) ∨ 𝑦 ∈ (𝑥𝑖𝑧))})})) ⊆ TarskiGB
51, 4eqsstri 3627 . . . 4 TarskiG ⊆ TarskiGB
6 axtrkg.g . . . 4 (𝜑𝐺 ∈ TarskiG)
75, 6sseldi 3593 . . 3 (𝜑𝐺 ∈ TarskiGB)
8 axtrkg.p . . . . . 6 𝑃 = (Base‘𝐺)
9 axtrkg.d . . . . . 6 = (dist‘𝐺)
10 axtrkg.i . . . . . 6 𝐼 = (Itv‘𝐺)
118, 9, 10istrkgb 25335 . . . . 5 (𝐺 ∈ TarskiGB ↔ (𝐺 ∈ V ∧ (∀𝑥𝑃𝑦𝑃 (𝑦 ∈ (𝑥𝐼𝑥) → 𝑥 = 𝑦) ∧ ∀𝑥𝑃𝑦𝑃𝑧𝑃𝑢𝑃𝑣𝑃 ((𝑢 ∈ (𝑥𝐼𝑧) ∧ 𝑣 ∈ (𝑦𝐼𝑧)) → ∃𝑎𝑃 (𝑎 ∈ (𝑢𝐼𝑦) ∧ 𝑎 ∈ (𝑣𝐼𝑥))) ∧ ∀𝑠 ∈ 𝒫 𝑃𝑡 ∈ 𝒫 𝑃(∃𝑎𝑃𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)))))
1211simprbi 480 . . . 4 (𝐺 ∈ TarskiGB → (∀𝑥𝑃𝑦𝑃 (𝑦 ∈ (𝑥𝐼𝑥) → 𝑥 = 𝑦) ∧ ∀𝑥𝑃𝑦𝑃𝑧𝑃𝑢𝑃𝑣𝑃 ((𝑢 ∈ (𝑥𝐼𝑧) ∧ 𝑣 ∈ (𝑦𝐼𝑧)) → ∃𝑎𝑃 (𝑎 ∈ (𝑢𝐼𝑦) ∧ 𝑎 ∈ (𝑣𝐼𝑥))) ∧ ∀𝑠 ∈ 𝒫 𝑃𝑡 ∈ 𝒫 𝑃(∃𝑎𝑃𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦))))
1312simp3d 1073 . . 3 (𝐺 ∈ TarskiGB → ∀𝑠 ∈ 𝒫 𝑃𝑡 ∈ 𝒫 𝑃(∃𝑎𝑃𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)))
147, 13syl 17 . 2 (𝜑 → ∀𝑠 ∈ 𝒫 𝑃𝑡 ∈ 𝒫 𝑃(∃𝑎𝑃𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)))
15 axtgcont.1 . . . 4 (𝜑𝑆𝑃)
16 fvex 6188 . . . . . . 7 (Base‘𝐺) ∈ V
178, 16eqeltri 2695 . . . . . 6 𝑃 ∈ V
1817ssex 4793 . . . . 5 (𝑆𝑃𝑆 ∈ V)
19 elpwg 4157 . . . . 5 (𝑆 ∈ V → (𝑆 ∈ 𝒫 𝑃𝑆𝑃))
2015, 18, 193syl 18 . . . 4 (𝜑 → (𝑆 ∈ 𝒫 𝑃𝑆𝑃))
2115, 20mpbird 247 . . 3 (𝜑𝑆 ∈ 𝒫 𝑃)
22 axtgcont.2 . . . 4 (𝜑𝑇𝑃)
2317ssex 4793 . . . . 5 (𝑇𝑃𝑇 ∈ V)
24 elpwg 4157 . . . . 5 (𝑇 ∈ V → (𝑇 ∈ 𝒫 𝑃𝑇𝑃))
2522, 23, 243syl 18 . . . 4 (𝜑 → (𝑇 ∈ 𝒫 𝑃𝑇𝑃))
2622, 25mpbird 247 . . 3 (𝜑𝑇 ∈ 𝒫 𝑃)
27 raleq 3133 . . . . . 6 (𝑠 = 𝑆 → (∀𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) ↔ ∀𝑥𝑆𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦)))
2827rexbidv 3048 . . . . 5 (𝑠 = 𝑆 → (∃𝑎𝑃𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) ↔ ∃𝑎𝑃𝑥𝑆𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦)))
29 raleq 3133 . . . . . 6 (𝑠 = 𝑆 → (∀𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦) ↔ ∀𝑥𝑆𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)))
3029rexbidv 3048 . . . . 5 (𝑠 = 𝑆 → (∃𝑏𝑃𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦) ↔ ∃𝑏𝑃𝑥𝑆𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)))
3128, 30imbi12d 334 . . . 4 (𝑠 = 𝑆 → ((∃𝑎𝑃𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)) ↔ (∃𝑎𝑃𝑥𝑆𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑆𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦))))
32 raleq 3133 . . . . . 6 (𝑡 = 𝑇 → (∀𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) ↔ ∀𝑦𝑇 𝑥 ∈ (𝑎𝐼𝑦)))
3332rexralbidv 3054 . . . . 5 (𝑡 = 𝑇 → (∃𝑎𝑃𝑥𝑆𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) ↔ ∃𝑎𝑃𝑥𝑆𝑦𝑇 𝑥 ∈ (𝑎𝐼𝑦)))
34 raleq 3133 . . . . . 6 (𝑡 = 𝑇 → (∀𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦) ↔ ∀𝑦𝑇 𝑏 ∈ (𝑥𝐼𝑦)))
3534rexralbidv 3054 . . . . 5 (𝑡 = 𝑇 → (∃𝑏𝑃𝑥𝑆𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦) ↔ ∃𝑏𝑃𝑥𝑆𝑦𝑇 𝑏 ∈ (𝑥𝐼𝑦)))
3633, 35imbi12d 334 . . . 4 (𝑡 = 𝑇 → ((∃𝑎𝑃𝑥𝑆𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑆𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)) ↔ (∃𝑎𝑃𝑥𝑆𝑦𝑇 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑆𝑦𝑇 𝑏 ∈ (𝑥𝐼𝑦))))
3731, 36rspc2v 3317 . . 3 ((𝑆 ∈ 𝒫 𝑃𝑇 ∈ 𝒫 𝑃) → (∀𝑠 ∈ 𝒫 𝑃𝑡 ∈ 𝒫 𝑃(∃𝑎𝑃𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)) → (∃𝑎𝑃𝑥𝑆𝑦𝑇 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑆𝑦𝑇 𝑏 ∈ (𝑥𝐼𝑦))))
3821, 26, 37syl2anc 692 . 2 (𝜑 → (∀𝑠 ∈ 𝒫 𝑃𝑡 ∈ 𝒫 𝑃(∃𝑎𝑃𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)) → (∃𝑎𝑃𝑥𝑆𝑦𝑇 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑆𝑦𝑇 𝑏 ∈ (𝑥𝐼𝑦))))
3914, 38mpd 15 1 (𝜑 → (∃𝑎𝑃𝑥𝑆𝑦𝑇 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑆𝑦𝑇 𝑏 ∈ (𝑥𝐼𝑦)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 384  w3o 1035  w3a 1036   = wceq 1481  wcel 1988  {cab 2606  wral 2909  wrex 2910  {crab 2913  Vcvv 3195  [wsbc 3429  cdif 3564  cin 3566  wss 3567  𝒫 cpw 4149  {csn 4168  cfv 5876  (class class class)co 6635  cmpt2 6637  Basecbs 15838  distcds 15931  TarskiGcstrkg 25310  TarskiGCcstrkgc 25311  TarskiGBcstrkgb 25312  TarskiGCBcstrkgcb 25313  Itvcitv 25316  LineGclng 25317
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1720  ax-4 1735  ax-5 1837  ax-6 1886  ax-7 1933  ax-9 1997  ax-10 2017  ax-11 2032  ax-12 2045  ax-13 2244  ax-ext 2600  ax-sep 4772  ax-nul 4780
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1484  df-ex 1703  df-nf 1708  df-sb 1879  df-eu 2472  df-clab 2607  df-cleq 2613  df-clel 2616  df-nfc 2751  df-ral 2914  df-rex 2915  df-rab 2918  df-v 3197  df-sbc 3430  df-dif 3570  df-un 3572  df-in 3574  df-ss 3581  df-nul 3908  df-if 4078  df-pw 4151  df-sn 4169  df-pr 4171  df-op 4175  df-uni 4428  df-br 4645  df-iota 5839  df-fv 5884  df-ov 6638  df-trkgb 25329  df-trkg 25333
This theorem is referenced by:  axtgcont  25349
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