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Theorem axtgcont1 26374
 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 26359 . . . . 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 4135 . . . . . 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 4136 . . . . . 6 (TarskiGC ∩ TarskiGB) ⊆ TarskiGB
42, 3sstri 3903 . . . . 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 3928 . . . 4 TarskiG ⊆ TarskiGB
6 axtrkg.g . . . 4 (𝜑𝐺 ∈ TarskiG)
75, 6sseldi 3892 . . 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 26361 . . . . 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 500 . . . 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 1141 . . 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)
168fvexi 6677 . . . . . 6 𝑃 ∈ V
1716ssex 5195 . . . . 5 (𝑆𝑃𝑆 ∈ V)
18 elpwg 4500 . . . . 5 (𝑆 ∈ V → (𝑆 ∈ 𝒫 𝑃𝑆𝑃))
1915, 17, 183syl 18 . . . 4 (𝜑 → (𝑆 ∈ 𝒫 𝑃𝑆𝑃))
2015, 19mpbird 260 . . 3 (𝜑𝑆 ∈ 𝒫 𝑃)
21 axtgcont.2 . . . 4 (𝜑𝑇𝑃)
2216ssex 5195 . . . . 5 (𝑇𝑃𝑇 ∈ V)
23 elpwg 4500 . . . . 5 (𝑇 ∈ V → (𝑇 ∈ 𝒫 𝑃𝑇𝑃))
2421, 22, 233syl 18 . . . 4 (𝜑 → (𝑇 ∈ 𝒫 𝑃𝑇𝑃))
2521, 24mpbird 260 . . 3 (𝜑𝑇 ∈ 𝒫 𝑃)
26 raleq 3323 . . . . . 6 (𝑠 = 𝑆 → (∀𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) ↔ ∀𝑥𝑆𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦)))
2726rexbidv 3221 . . . . 5 (𝑠 = 𝑆 → (∃𝑎𝑃𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) ↔ ∃𝑎𝑃𝑥𝑆𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦)))
28 raleq 3323 . . . . . 6 (𝑠 = 𝑆 → (∀𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦) ↔ ∀𝑥𝑆𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)))
2928rexbidv 3221 . . . . 5 (𝑠 = 𝑆 → (∃𝑏𝑃𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦) ↔ ∃𝑏𝑃𝑥𝑆𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)))
3027, 29imbi12d 348 . . . 4 (𝑠 = 𝑆 → ((∃𝑎𝑃𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)) ↔ (∃𝑎𝑃𝑥𝑆𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑆𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦))))
31 raleq 3323 . . . . . 6 (𝑡 = 𝑇 → (∀𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) ↔ ∀𝑦𝑇 𝑥 ∈ (𝑎𝐼𝑦)))
3231rexralbidv 3225 . . . . 5 (𝑡 = 𝑇 → (∃𝑎𝑃𝑥𝑆𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) ↔ ∃𝑎𝑃𝑥𝑆𝑦𝑇 𝑥 ∈ (𝑎𝐼𝑦)))
33 raleq 3323 . . . . . 6 (𝑡 = 𝑇 → (∀𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦) ↔ ∀𝑦𝑇 𝑏 ∈ (𝑥𝐼𝑦)))
3433rexralbidv 3225 . . . . 5 (𝑡 = 𝑇 → (∃𝑏𝑃𝑥𝑆𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦) ↔ ∃𝑏𝑃𝑥𝑆𝑦𝑇 𝑏 ∈ (𝑥𝐼𝑦)))
3532, 34imbi12d 348 . . . 4 (𝑡 = 𝑇 → ((∃𝑎𝑃𝑥𝑆𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑆𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)) ↔ (∃𝑎𝑃𝑥𝑆𝑦𝑇 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑆𝑦𝑇 𝑏 ∈ (𝑥𝐼𝑦))))
3630, 35rspc2v 3553 . . 3 ((𝑆 ∈ 𝒫 𝑃𝑇 ∈ 𝒫 𝑃) → (∀𝑠 ∈ 𝒫 𝑃𝑡 ∈ 𝒫 𝑃(∃𝑎𝑃𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)) → (∃𝑎𝑃𝑥𝑆𝑦𝑇 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑆𝑦𝑇 𝑏 ∈ (𝑥𝐼𝑦))))
3720, 25, 36syl2anc 587 . 2 (𝜑 → (∀𝑠 ∈ 𝒫 𝑃𝑡 ∈ 𝒫 𝑃(∃𝑎𝑃𝑥𝑠𝑦𝑡 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑠𝑦𝑡 𝑏 ∈ (𝑥𝐼𝑦)) → (∃𝑎𝑃𝑥𝑆𝑦𝑇 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑆𝑦𝑇 𝑏 ∈ (𝑥𝐼𝑦))))
3814, 37mpd 15 1 (𝜑 → (∃𝑎𝑃𝑥𝑆𝑦𝑇 𝑥 ∈ (𝑎𝐼𝑦) → ∃𝑏𝑃𝑥𝑆𝑦𝑇 𝑏 ∈ (𝑥𝐼𝑦)))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 209   ∧ wa 399   ∨ w3o 1083   ∧ w3a 1084   = wceq 1538   ∈ wcel 2111  {cab 2735  ∀wral 3070  ∃wrex 3071  {crab 3074  Vcvv 3409  [wsbc 3698   ∖ cdif 3857   ∩ cin 3859   ⊆ wss 3860  𝒫 cpw 4497  {csn 4525  ‘cfv 6340  (class class class)co 7156   ∈ cmpo 7158  Basecbs 16554  distcds 16645  TarskiGcstrkg 26336  TarskiGCcstrkgc 26337  TarskiGBcstrkgb 26338  TarskiGCBcstrkgcb 26339  Itvcitv 26342  LineGclng 26343 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 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2729  ax-sep 5173  ax-nul 5180 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2557  df-eu 2588  df-clab 2736  df-cleq 2750  df-clel 2830  df-nfc 2901  df-ral 3075  df-rex 3076  df-rab 3079  df-v 3411  df-sbc 3699  df-dif 3863  df-un 3865  df-in 3867  df-ss 3877  df-nul 4228  df-pw 4499  df-sn 4526  df-pr 4528  df-op 4532  df-uni 4802  df-br 5037  df-iota 6299  df-fv 6348  df-ov 7159  df-trkgb 26355  df-trkg 26359 This theorem is referenced by:  axtgcont  26375
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