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Theorem ismidb 25570
 Description: Property of the midpoint. (Contributed by Thierry Arnoux, 1-Dec-2019.)
Hypotheses
Ref Expression
ismid.p 𝑃 = (Base‘𝐺)
ismid.d = (dist‘𝐺)
ismid.i 𝐼 = (Itv‘𝐺)
ismid.g (𝜑𝐺 ∈ TarskiG)
ismid.1 (𝜑𝐺DimTarskiG≥2)
midcl.1 (𝜑𝐴𝑃)
midcl.2 (𝜑𝐵𝑃)
ismidb.s 𝑆 = (pInvG‘𝐺)
ismidb.m (𝜑𝑀𝑃)
Assertion
Ref Expression
ismidb (𝜑 → (𝐵 = ((𝑆𝑀)‘𝐴) ↔ (𝐴(midG‘𝐺)𝐵) = 𝑀))

Proof of Theorem ismidb
Dummy variables 𝑚 𝑎 𝑏 𝑔 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ismidb.m . . 3 (𝜑𝑀𝑃)
2 ismid.p . . . 4 𝑃 = (Base‘𝐺)
3 ismid.d . . . 4 = (dist‘𝐺)
4 ismid.i . . . 4 𝐼 = (Itv‘𝐺)
5 eqid 2621 . . . 4 (LineG‘𝐺) = (LineG‘𝐺)
6 ismid.g . . . 4 (𝜑𝐺 ∈ TarskiG)
7 ismidb.s . . . 4 𝑆 = (pInvG‘𝐺)
8 midcl.1 . . . 4 (𝜑𝐴𝑃)
9 midcl.2 . . . 4 (𝜑𝐵𝑃)
10 ismid.1 . . . 4 (𝜑𝐺DimTarskiG≥2)
112, 3, 4, 5, 6, 7, 8, 9, 10mideu 25530 . . 3 (𝜑 → ∃!𝑚𝑃 𝐵 = ((𝑆𝑚)‘𝐴))
12 fveq2 6148 . . . . . 6 (𝑚 = 𝑀 → (𝑆𝑚) = (𝑆𝑀))
1312fveq1d 6150 . . . . 5 (𝑚 = 𝑀 → ((𝑆𝑚)‘𝐴) = ((𝑆𝑀)‘𝐴))
1413eqeq2d 2631 . . . 4 (𝑚 = 𝑀 → (𝐵 = ((𝑆𝑚)‘𝐴) ↔ 𝐵 = ((𝑆𝑀)‘𝐴)))
1514riota2 6587 . . 3 ((𝑀𝑃 ∧ ∃!𝑚𝑃 𝐵 = ((𝑆𝑚)‘𝐴)) → (𝐵 = ((𝑆𝑀)‘𝐴) ↔ (𝑚𝑃 𝐵 = ((𝑆𝑚)‘𝐴)) = 𝑀))
161, 11, 15syl2anc 692 . 2 (𝜑 → (𝐵 = ((𝑆𝑀)‘𝐴) ↔ (𝑚𝑃 𝐵 = ((𝑆𝑚)‘𝐴)) = 𝑀))
17 df-mid 25566 . . . . . 6 midG = (𝑔 ∈ V ↦ (𝑎 ∈ (Base‘𝑔), 𝑏 ∈ (Base‘𝑔) ↦ (𝑚 ∈ (Base‘𝑔)𝑏 = (((pInvG‘𝑔)‘𝑚)‘𝑎))))
1817a1i 11 . . . . 5 (𝜑 → midG = (𝑔 ∈ V ↦ (𝑎 ∈ (Base‘𝑔), 𝑏 ∈ (Base‘𝑔) ↦ (𝑚 ∈ (Base‘𝑔)𝑏 = (((pInvG‘𝑔)‘𝑚)‘𝑎)))))
19 fveq2 6148 . . . . . . . 8 (𝑔 = 𝐺 → (Base‘𝑔) = (Base‘𝐺))
2019, 2syl6eqr 2673 . . . . . . 7 (𝑔 = 𝐺 → (Base‘𝑔) = 𝑃)
21 fveq2 6148 . . . . . . . . . . . 12 (𝑔 = 𝐺 → (pInvG‘𝑔) = (pInvG‘𝐺))
2221, 7syl6eqr 2673 . . . . . . . . . . 11 (𝑔 = 𝐺 → (pInvG‘𝑔) = 𝑆)
2322fveq1d 6150 . . . . . . . . . 10 (𝑔 = 𝐺 → ((pInvG‘𝑔)‘𝑚) = (𝑆𝑚))
2423fveq1d 6150 . . . . . . . . 9 (𝑔 = 𝐺 → (((pInvG‘𝑔)‘𝑚)‘𝑎) = ((𝑆𝑚)‘𝑎))
2524eqeq2d 2631 . . . . . . . 8 (𝑔 = 𝐺 → (𝑏 = (((pInvG‘𝑔)‘𝑚)‘𝑎) ↔ 𝑏 = ((𝑆𝑚)‘𝑎)))
2620, 25riotaeqbidv 6568 . . . . . . 7 (𝑔 = 𝐺 → (𝑚 ∈ (Base‘𝑔)𝑏 = (((pInvG‘𝑔)‘𝑚)‘𝑎)) = (𝑚𝑃 𝑏 = ((𝑆𝑚)‘𝑎)))
2720, 20, 26mpt2eq123dv 6670 . . . . . 6 (𝑔 = 𝐺 → (𝑎 ∈ (Base‘𝑔), 𝑏 ∈ (Base‘𝑔) ↦ (𝑚 ∈ (Base‘𝑔)𝑏 = (((pInvG‘𝑔)‘𝑚)‘𝑎))) = (𝑎𝑃, 𝑏𝑃 ↦ (𝑚𝑃 𝑏 = ((𝑆𝑚)‘𝑎))))
2827adantl 482 . . . . 5 ((𝜑𝑔 = 𝐺) → (𝑎 ∈ (Base‘𝑔), 𝑏 ∈ (Base‘𝑔) ↦ (𝑚 ∈ (Base‘𝑔)𝑏 = (((pInvG‘𝑔)‘𝑚)‘𝑎))) = (𝑎𝑃, 𝑏𝑃 ↦ (𝑚𝑃 𝑏 = ((𝑆𝑚)‘𝑎))))
29 elex 3198 . . . . . 6 (𝐺 ∈ TarskiG → 𝐺 ∈ V)
306, 29syl 17 . . . . 5 (𝜑𝐺 ∈ V)
31 fvex 6158 . . . . . . . 8 (Base‘𝐺) ∈ V
322, 31eqeltri 2694 . . . . . . 7 𝑃 ∈ V
3332, 32mpt2ex 7192 . . . . . 6 (𝑎𝑃, 𝑏𝑃 ↦ (𝑚𝑃 𝑏 = ((𝑆𝑚)‘𝑎))) ∈ V
3433a1i 11 . . . . 5 (𝜑 → (𝑎𝑃, 𝑏𝑃 ↦ (𝑚𝑃 𝑏 = ((𝑆𝑚)‘𝑎))) ∈ V)
3518, 28, 30, 34fvmptd 6245 . . . 4 (𝜑 → (midG‘𝐺) = (𝑎𝑃, 𝑏𝑃 ↦ (𝑚𝑃 𝑏 = ((𝑆𝑚)‘𝑎))))
36 simprr 795 . . . . . 6 ((𝜑 ∧ (𝑎 = 𝐴𝑏 = 𝐵)) → 𝑏 = 𝐵)
37 simprl 793 . . . . . . 7 ((𝜑 ∧ (𝑎 = 𝐴𝑏 = 𝐵)) → 𝑎 = 𝐴)
3837fveq2d 6152 . . . . . 6 ((𝜑 ∧ (𝑎 = 𝐴𝑏 = 𝐵)) → ((𝑆𝑚)‘𝑎) = ((𝑆𝑚)‘𝐴))
3936, 38eqeq12d 2636 . . . . 5 ((𝜑 ∧ (𝑎 = 𝐴𝑏 = 𝐵)) → (𝑏 = ((𝑆𝑚)‘𝑎) ↔ 𝐵 = ((𝑆𝑚)‘𝐴)))
4039riotabidv 6567 . . . 4 ((𝜑 ∧ (𝑎 = 𝐴𝑏 = 𝐵)) → (𝑚𝑃 𝑏 = ((𝑆𝑚)‘𝑎)) = (𝑚𝑃 𝐵 = ((𝑆𝑚)‘𝐴)))
41 riotacl 6579 . . . . 5 (∃!𝑚𝑃 𝐵 = ((𝑆𝑚)‘𝐴) → (𝑚𝑃 𝐵 = ((𝑆𝑚)‘𝐴)) ∈ 𝑃)
4211, 41syl 17 . . . 4 (𝜑 → (𝑚𝑃 𝐵 = ((𝑆𝑚)‘𝐴)) ∈ 𝑃)
4335, 40, 8, 9, 42ovmpt2d 6741 . . 3 (𝜑 → (𝐴(midG‘𝐺)𝐵) = (𝑚𝑃 𝐵 = ((𝑆𝑚)‘𝐴)))
4443eqeq1d 2623 . 2 (𝜑 → ((𝐴(midG‘𝐺)𝐵) = 𝑀 ↔ (𝑚𝑃 𝐵 = ((𝑆𝑚)‘𝐴)) = 𝑀))
4516, 44bitr4d 271 1 (𝜑 → (𝐵 = ((𝑆𝑀)‘𝐴) ↔ (𝐴(midG‘𝐺)𝐵) = 𝑀))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 384   = wceq 1480   ∈ wcel 1987  ∃!wreu 2909  Vcvv 3186   class class class wbr 4613   ↦ cmpt 4673  ‘cfv 5847  ℩crio 6564  (class class class)co 6604   ↦ cmpt2 6606  2c2 11014  Basecbs 15781  distcds 15871  TarskiGcstrkg 25229  DimTarskiG≥cstrkgld 25233  Itvcitv 25235  LineGclng 25236  pInvGcmir 25447  midGcmid 25564 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-rep 4731  ax-sep 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867  ax-un 6902  ax-cnex 9936  ax-resscn 9937  ax-1cn 9938  ax-icn 9939  ax-addcl 9940  ax-addrcl 9941  ax-mulcl 9942  ax-mulrcl 9943  ax-mulcom 9944  ax-addass 9945  ax-mulass 9946  ax-distr 9947  ax-i2m1 9948  ax-1ne0 9949  ax-1rid 9950  ax-rnegex 9951  ax-rrecex 9952  ax-cnre 9953  ax-pre-lttri 9954  ax-pre-lttrn 9955  ax-pre-ltadd 9956  ax-pre-mulgt0 9957 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-nel 2894  df-ral 2912  df-rex 2913  df-reu 2914  df-rmo 2915  df-rab 2916  df-v 3188  df-sbc 3418  df-csb 3515  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-pss 3571  df-nul 3892  df-if 4059  df-pw 4132  df-sn 4149  df-pr 4151  df-tp 4153  df-op 4155  df-uni 4403  df-int 4441  df-iun 4487  df-br 4614  df-opab 4674  df-mpt 4675  df-tr 4713  df-eprel 4985  df-id 4989  df-po 4995  df-so 4996  df-fr 5033  df-we 5035  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-res 5086  df-ima 5087  df-pred 5639  df-ord 5685  df-on 5686  df-lim 5687  df-suc 5688  df-iota 5810  df-fun 5849  df-fn 5850  df-f 5851  df-f1 5852  df-fo 5853  df-f1o 5854  df-fv 5855  df-riota 6565  df-ov 6607  df-oprab 6608  df-mpt2 6609  df-om 7013  df-1st 7113  df-2nd 7114  df-wrecs 7352  df-recs 7413  df-rdg 7451  df-1o 7505  df-oadd 7509  df-er 7687  df-map 7804  df-pm 7805  df-en 7900  df-dom 7901  df-sdom 7902  df-fin 7903  df-card 8709  df-cda 8934  df-pnf 10020  df-mnf 10021  df-xr 10022  df-ltxr 10023  df-le 10024  df-sub 10212  df-neg 10213  df-nn 10965  df-2 11023  df-3 11024  df-n0 11237  df-xnn0 11308  df-z 11322  df-uz 11632  df-fz 12269  df-fzo 12407  df-hash 13058  df-word 13238  df-concat 13240  df-s1 13241  df-s2 13530  df-s3 13531  df-trkgc 25247  df-trkgb 25248  df-trkgcb 25249  df-trkgld 25251  df-trkg 25252  df-cgrg 25306  df-leg 25378  df-mir 25448  df-rag 25489  df-perpg 25491  df-mid 25566 This theorem is referenced by:  midbtwn  25571  midcgr  25572  midcom  25574  mirmid  25575  lmieu  25576  lmimid  25586  lmiisolem  25588  hypcgrlem1  25591  hypcgrlem2  25592  hypcgr  25593  trgcopyeulem  25597
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