Theorem ismidb 25884

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	⊢ (𝜑 → 𝐺 ∈ TarskiG)
ismid.1	⊢ (𝜑 → 𝐺DimTarskiG≥2)
midcl.1	⊢ (𝜑 → 𝐴 ∈ 𝑃)
midcl.2	⊢ (𝜑 → 𝐵 ∈ 𝑃)
ismidb.s	⊢ 𝑆 = (pInvG‘𝐺)
ismidb.m	⊢ (𝜑 → 𝑀 ∈ 𝑃)

Assertion

Ref	Expression
ismidb	⊢ (𝜑 → (𝐵 = ((𝑆‘𝑀)‘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.

Step	Hyp	Ref	Expression
1		ismidb.m	. . 3 ⊢ (𝜑 → 𝑀 ∈ 𝑃)
2		ismid.p	. . . 4 ⊢ 𝑃 = (Base‘𝐺)
3		ismid.d	. . . 4 ⊢ − = (dist‘𝐺)
4		ismid.i	. . . 4 ⊢ 𝐼 = (Itv‘𝐺)
5		eqid 2806	. . . 4 ⊢ (LineG‘𝐺) = (LineG‘𝐺)
6		ismid.g	. . . 4 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
7		ismidb.s	. . . 4 ⊢ 𝑆 = (pInvG‘𝐺)
8		midcl.1	. . . 4 ⊢ (𝜑 → 𝐴 ∈ 𝑃)
9		midcl.2	. . . 4 ⊢ (𝜑 → 𝐵 ∈ 𝑃)
10		ismid.1	. . . 4 ⊢ (𝜑 → 𝐺DimTarskiG≥2)
11	2, 3, 4, 5, 6, 7, 8, 9, 10	mideu 25844	. . 3 ⊢ (𝜑 → ∃!𝑚 ∈ 𝑃 𝐵 = ((𝑆‘𝑚)‘𝐴))
12		fveq2 6408	. . . . . 6 ⊢ (𝑚 = 𝑀 → (𝑆‘𝑚) = (𝑆‘𝑀))
13	12	fveq1d 6410	. . . . 5 ⊢ (𝑚 = 𝑀 → ((𝑆‘𝑚)‘𝐴) = ((𝑆‘𝑀)‘𝐴))
14	13	eqeq2d 2816	. . . 4 ⊢ (𝑚 = 𝑀 → (𝐵 = ((𝑆‘𝑚)‘𝐴) ↔ 𝐵 = ((𝑆‘𝑀)‘𝐴)))
15	14	riota2 6857	. . 3 ⊢ ((𝑀 ∈ 𝑃 ∧ ∃!𝑚 ∈ 𝑃 𝐵 = ((𝑆‘𝑚)‘𝐴)) → (𝐵 = ((𝑆‘𝑀)‘𝐴) ↔ (℩𝑚 ∈ 𝑃 𝐵 = ((𝑆‘𝑚)‘𝐴)) = 𝑀))
16	1, 11, 15	syl2anc 575	. 2 ⊢ (𝜑 → (𝐵 = ((𝑆‘𝑀)‘𝐴) ↔ (℩𝑚 ∈ 𝑃 𝐵 = ((𝑆‘𝑚)‘𝐴)) = 𝑀))
17		df-mid 25880	. . . . . 6 ⊢ midG = (𝑔 ∈ V ↦ (𝑎 ∈ (Base‘𝑔), 𝑏 ∈ (Base‘𝑔) ↦ (℩𝑚 ∈ (Base‘𝑔)𝑏 = (((pInvG‘𝑔)‘𝑚)‘𝑎))))
18	17	a1i 11	. . . . 5 ⊢ (𝜑 → midG = (𝑔 ∈ V ↦ (𝑎 ∈ (Base‘𝑔), 𝑏 ∈ (Base‘𝑔) ↦ (℩𝑚 ∈ (Base‘𝑔)𝑏 = (((pInvG‘𝑔)‘𝑚)‘𝑎)))))
19		fveq2 6408	. . . . . . . 8 ⊢ (𝑔 = 𝐺 → (Base‘𝑔) = (Base‘𝐺))
20	19, 2	syl6eqr 2858	. . . . . . 7 ⊢ (𝑔 = 𝐺 → (Base‘𝑔) = 𝑃)
21		fveq2 6408	. . . . . . . . . . . 12 ⊢ (𝑔 = 𝐺 → (pInvG‘𝑔) = (pInvG‘𝐺))
22	21, 7	syl6eqr 2858	. . . . . . . . . . 11 ⊢ (𝑔 = 𝐺 → (pInvG‘𝑔) = 𝑆)
23	22	fveq1d 6410	. . . . . . . . . 10 ⊢ (𝑔 = 𝐺 → ((pInvG‘𝑔)‘𝑚) = (𝑆‘𝑚))
24	23	fveq1d 6410	. . . . . . . . 9 ⊢ (𝑔 = 𝐺 → (((pInvG‘𝑔)‘𝑚)‘𝑎) = ((𝑆‘𝑚)‘𝑎))
25	24	eqeq2d 2816	. . . . . . . 8 ⊢ (𝑔 = 𝐺 → (𝑏 = (((pInvG‘𝑔)‘𝑚)‘𝑎) ↔ 𝑏 = ((𝑆‘𝑚)‘𝑎)))
26	20, 25	riotaeqbidv 6838	. . . . . . 7 ⊢ (𝑔 = 𝐺 → (℩𝑚 ∈ (Base‘𝑔)𝑏 = (((pInvG‘𝑔)‘𝑚)‘𝑎)) = (℩𝑚 ∈ 𝑃 𝑏 = ((𝑆‘𝑚)‘𝑎)))
27	20, 20, 26	mpt2eq123dv 6947	. . . . . 6 ⊢ (𝑔 = 𝐺 → (𝑎 ∈ (Base‘𝑔), 𝑏 ∈ (Base‘𝑔) ↦ (℩𝑚 ∈ (Base‘𝑔)𝑏 = (((pInvG‘𝑔)‘𝑚)‘𝑎))) = (𝑎 ∈ 𝑃, 𝑏 ∈ 𝑃 ↦ (℩𝑚 ∈ 𝑃 𝑏 = ((𝑆‘𝑚)‘𝑎))))
28	27	adantl 469	. . . . 5 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → (𝑎 ∈ (Base‘𝑔), 𝑏 ∈ (Base‘𝑔) ↦ (℩𝑚 ∈ (Base‘𝑔)𝑏 = (((pInvG‘𝑔)‘𝑚)‘𝑎))) = (𝑎 ∈ 𝑃, 𝑏 ∈ 𝑃 ↦ (℩𝑚 ∈ 𝑃 𝑏 = ((𝑆‘𝑚)‘𝑎))))
29		elex 3406	. . . . . 6 ⊢ (𝐺 ∈ TarskiG → 𝐺 ∈ V)
30	6, 29	syl 17	. . . . 5 ⊢ (𝜑 → 𝐺 ∈ V)
31	2	fvexi 6422	. . . . . . 7 ⊢ 𝑃 ∈ V
32	31, 31	mpt2ex 7480	. . . . . 6 ⊢ (𝑎 ∈ 𝑃, 𝑏 ∈ 𝑃 ↦ (℩𝑚 ∈ 𝑃 𝑏 = ((𝑆‘𝑚)‘𝑎))) ∈ V
33	32	a1i 11	. . . . 5 ⊢ (𝜑 → (𝑎 ∈ 𝑃, 𝑏 ∈ 𝑃 ↦ (℩𝑚 ∈ 𝑃 𝑏 = ((𝑆‘𝑚)‘𝑎))) ∈ V)
34	18, 28, 30, 33	fvmptd 6509	. . . 4 ⊢ (𝜑 → (midG‘𝐺) = (𝑎 ∈ 𝑃, 𝑏 ∈ 𝑃 ↦ (℩𝑚 ∈ 𝑃 𝑏 = ((𝑆‘𝑚)‘𝑎))))
35		simprr 780	. . . . . 6 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑏 = 𝐵)) → 𝑏 = 𝐵)
36		simprl 778	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑏 = 𝐵)) → 𝑎 = 𝐴)
37	36	fveq2d 6412	. . . . . 6 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑏 = 𝐵)) → ((𝑆‘𝑚)‘𝑎) = ((𝑆‘𝑚)‘𝐴))
38	35, 37	eqeq12d 2821	. . . . 5 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑏 = 𝐵)) → (𝑏 = ((𝑆‘𝑚)‘𝑎) ↔ 𝐵 = ((𝑆‘𝑚)‘𝐴)))
39	38	riotabidv 6837	. . . 4 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑏 = 𝐵)) → (℩𝑚 ∈ 𝑃 𝑏 = ((𝑆‘𝑚)‘𝑎)) = (℩𝑚 ∈ 𝑃 𝐵 = ((𝑆‘𝑚)‘𝐴)))
40		riotacl 6849	. . . . 5 ⊢ (∃!𝑚 ∈ 𝑃 𝐵 = ((𝑆‘𝑚)‘𝐴) → (℩𝑚 ∈ 𝑃 𝐵 = ((𝑆‘𝑚)‘𝐴)) ∈ 𝑃)
41	11, 40	syl 17	. . . 4 ⊢ (𝜑 → (℩𝑚 ∈ 𝑃 𝐵 = ((𝑆‘𝑚)‘𝐴)) ∈ 𝑃)
42	34, 39, 8, 9, 41	ovmpt2d 7018	. . 3 ⊢ (𝜑 → (𝐴(midG‘𝐺)𝐵) = (℩𝑚 ∈ 𝑃 𝐵 = ((𝑆‘𝑚)‘𝐴)))
43	42	eqeq1d 2808	. 2 ⊢ (𝜑 → ((𝐴(midG‘𝐺)𝐵) = 𝑀 ↔ (℩𝑚 ∈ 𝑃 𝐵 = ((𝑆‘𝑚)‘𝐴)) = 𝑀))
44	16, 43	bitr4d 273	1 ⊢ (𝜑 → (𝐵 = ((𝑆‘𝑀)‘𝐴) ↔ (𝐴(midG‘𝐺)𝐵) = 𝑀))

Syntax hints:   → wi 4   ↔ wb 197   ∧ wa 384   = wceq 1637   ∈ wcel 2156  ∃!wreu 3098  Vcvv 3391   class class class wbr 4844   ↦ cmpt 4923  ‘cfv 6101  ℩crio 6834  (class class class)co 6874   ↦ cmpt2 6876  2c2 11356  Basecbs 16068  distcds 16162  TarskiGcstrkg 25543  Dim_TarskiG≥cstrkgld 25547  Itvcitv 25549  LineGclng 25550  pInvGcmir 25761  midGcmid 25878

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1877  ax-4 1894  ax-5 2001  ax-6 2068  ax-7 2104  ax-8 2158  ax-9 2165  ax-10 2185  ax-11 2201  ax-12 2214  ax-13 2420  ax-ext 2784  ax-rep 4964  ax-sep 4975  ax-nul 4983  ax-pow 5035  ax-pr 5096  ax-un 7179  ax-cnex 10277  ax-resscn 10278  ax-1cn 10279  ax-icn 10280  ax-addcl 10281  ax-addrcl 10282  ax-mulcl 10283  ax-mulrcl 10284  ax-mulcom 10285  ax-addass 10286  ax-mulass 10287  ax-distr 10288  ax-i2m1 10289  ax-1ne0 10290  ax-1rid 10291  ax-rnegex 10292  ax-rrecex 10293  ax-cnre 10294  ax-pre-lttri 10295  ax-pre-lttrn 10296  ax-pre-ltadd 10297  ax-pre-mulgt0 10298

This theorem depends on definitions:  df-bi 198  df-an 385  df-or 866  df-3or 1101  df-3an 1102  df-tru 1641  df-ex 1860  df-nf 1864  df-sb 2061  df-eu 2634  df-mo 2635  df-clab 2793  df-cleq 2799  df-clel 2802  df-nfc 2937  df-ne 2979  df-nel 3082  df-ral 3101  df-rex 3102  df-reu 3103  df-rmo 3104  df-rab 3105  df-v 3393  df-sbc 3634  df-csb 3729  df-dif 3772  df-un 3774  df-in 3776  df-ss 3783  df-pss 3785  df-nul 4117  df-if 4280  df-pw 4353  df-sn 4371  df-pr 4373  df-tp 4375  df-op 4377  df-uni 4631  df-int 4670  df-iun 4714  df-br 4845  df-opab 4907  df-mpt 4924  df-tr 4947  df-id 5219  df-eprel 5224  df-po 5232  df-so 5233  df-fr 5270  df-we 5272  df-xp 5317  df-rel 5318  df-cnv 5319  df-co 5320  df-dm 5321  df-rn 5322  df-res 5323  df-ima 5324  df-pred 5893  df-ord 5939  df-on 5940  df-lim 5941  df-suc 5942  df-iota 6064  df-fun 6103  df-fn 6104  df-f 6105  df-f1 6106  df-fo 6107  df-f1o 6108  df-fv 6109  df-riota 6835  df-ov 6877  df-oprab 6878  df-mpt2 6879  df-om 7296  df-1st 7398  df-2nd 7399  df-wrecs 7642  df-recs 7704  df-rdg 7742  df-1o 7796  df-oadd 7800  df-er 7979  df-map 8094  df-pm 8095  df-en 8193  df-dom 8194  df-sdom 8195  df-fin 8196  df-card 9048  df-cda 9275  df-pnf 10361  df-mnf 10362  df-xr 10363  df-ltxr 10364  df-le 10365  df-sub 10553  df-neg 10554  df-nn 11306  df-2 11364  df-3 11365  df-n0 11560  df-xnn0 11630  df-z 11644  df-uz 11905  df-fz 12550  df-fzo 12690  df-hash 13338  df-word 13510  df-concat 13512  df-s1 13513  df-s2 13817  df-s3 13818  df-trkgc 25561  df-trkgb 25562  df-trkgcb 25563  df-trkgld 25565  df-trkg 25566  df-cgrg 25620  df-leg 25692  df-mir 25762  df-rag 25803  df-perpg 25805  df-mid 25880

This theorem is referenced by:  midbtwn  25885  midcgr  25886  midcom  25888  mirmid  25889  lmieu  25890  lmimid  25900  lmiisolem  25902  hypcgrlem1  25905  hypcgrlem2  25906  hypcgr  25907  trgcopyeulem  25911