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Theorem ucnextcn 22155
Description: Extension by continuity. Theorem 2 of [BourbakiTop1] p. II.20. Given an uniform space on a set 𝑋, a subset 𝐴 dense in 𝑋, and a function 𝐹 uniformly continuous from 𝐴 to 𝑌, that function can be extended by continuity to the whole 𝑋, and its extension is uniformly continuous. (Contributed by Thierry Arnoux, 25-Jan-2018.)
Hypotheses
Ref Expression
ucnextcn.x 𝑋 = (Base‘𝑉)
ucnextcn.y 𝑌 = (Base‘𝑊)
ucnextcn.j 𝐽 = (TopOpen‘𝑉)
ucnextcn.k 𝐾 = (TopOpen‘𝑊)
ucnextcn.s 𝑆 = (UnifSt‘𝑉)
ucnextcn.t 𝑇 = (UnifSt‘(𝑉s 𝐴))
ucnextcn.u 𝑈 = (UnifSt‘𝑊)
ucnextcn.v (𝜑𝑉 ∈ TopSp)
ucnextcn.r (𝜑𝑉 ∈ UnifSp)
ucnextcn.w (𝜑𝑊 ∈ TopSp)
ucnextcn.z (𝜑𝑊 ∈ CUnifSp)
ucnextcn.h (𝜑𝐾 ∈ Haus)
ucnextcn.a (𝜑𝐴𝑋)
ucnextcn.f (𝜑𝐹 ∈ (𝑇 Cnu𝑈))
ucnextcn.c (𝜑 → ((cls‘𝐽)‘𝐴) = 𝑋)
Assertion
Ref Expression
ucnextcn (𝜑 → ((𝐽CnExt𝐾)‘𝐹) ∈ (𝐽 Cn 𝐾))

Proof of Theorem ucnextcn
Dummy variables 𝑎 𝑏 𝑣 𝑤 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ucnextcn.x . 2 𝑋 = (Base‘𝑉)
2 ucnextcn.y . 2 𝑌 = (Base‘𝑊)
3 ucnextcn.j . 2 𝐽 = (TopOpen‘𝑉)
4 ucnextcn.k . 2 𝐾 = (TopOpen‘𝑊)
5 ucnextcn.u . 2 𝑈 = (UnifSt‘𝑊)
6 ucnextcn.v . 2 (𝜑𝑉 ∈ TopSp)
7 ucnextcn.w . 2 (𝜑𝑊 ∈ TopSp)
8 ucnextcn.z . 2 (𝜑𝑊 ∈ CUnifSp)
9 ucnextcn.h . 2 (𝜑𝐾 ∈ Haus)
10 ucnextcn.a . 2 (𝜑𝐴𝑋)
11 ucnextcn.f . . . 4 (𝜑𝐹 ∈ (𝑇 Cnu𝑈))
12 ucnextcn.r . . . . . 6 (𝜑𝑉 ∈ UnifSp)
13 ucnextcn.t . . . . . . 7 𝑇 = (UnifSt‘(𝑉s 𝐴))
141, 13ressust 22115 . . . . . 6 ((𝑉 ∈ UnifSp ∧ 𝐴𝑋) → 𝑇 ∈ (UnifOn‘𝐴))
1512, 10, 14syl2anc 694 . . . . 5 (𝜑𝑇 ∈ (UnifOn‘𝐴))
16 cuspusp 22151 . . . . . . . 8 (𝑊 ∈ CUnifSp → 𝑊 ∈ UnifSp)
178, 16syl 17 . . . . . . 7 (𝜑𝑊 ∈ UnifSp)
182, 5, 4isusp 22112 . . . . . . 7 (𝑊 ∈ UnifSp ↔ (𝑈 ∈ (UnifOn‘𝑌) ∧ 𝐾 = (unifTop‘𝑈)))
1917, 18sylib 208 . . . . . 6 (𝜑 → (𝑈 ∈ (UnifOn‘𝑌) ∧ 𝐾 = (unifTop‘𝑈)))
2019simpld 474 . . . . 5 (𝜑𝑈 ∈ (UnifOn‘𝑌))
21 isucn 22129 . . . . 5 ((𝑇 ∈ (UnifOn‘𝐴) ∧ 𝑈 ∈ (UnifOn‘𝑌)) → (𝐹 ∈ (𝑇 Cnu𝑈) ↔ (𝐹:𝐴𝑌 ∧ ∀𝑤𝑈𝑣𝑇𝑦𝐴𝑧𝐴 (𝑦𝑣𝑧 → (𝐹𝑦)𝑤(𝐹𝑧)))))
2215, 20, 21syl2anc 694 . . . 4 (𝜑 → (𝐹 ∈ (𝑇 Cnu𝑈) ↔ (𝐹:𝐴𝑌 ∧ ∀𝑤𝑈𝑣𝑇𝑦𝐴𝑧𝐴 (𝑦𝑣𝑧 → (𝐹𝑦)𝑤(𝐹𝑧)))))
2311, 22mpbid 222 . . 3 (𝜑 → (𝐹:𝐴𝑌 ∧ ∀𝑤𝑈𝑣𝑇𝑦𝐴𝑧𝐴 (𝑦𝑣𝑧 → (𝐹𝑦)𝑤(𝐹𝑧))))
2423simpld 474 . 2 (𝜑𝐹:𝐴𝑌)
25 ucnextcn.c . 2 (𝜑 → ((cls‘𝐽)‘𝐴) = 𝑋)
2620adantr 480 . . . . 5 ((𝜑𝑥𝑋) → 𝑈 ∈ (UnifOn‘𝑌))
2726elfvexd 6260 . . . 4 ((𝜑𝑥𝑋) → 𝑌 ∈ V)
28 simpr 476 . . . . . . 7 ((𝜑𝑥𝑋) → 𝑥𝑋)
2925adantr 480 . . . . . . 7 ((𝜑𝑥𝑋) → ((cls‘𝐽)‘𝐴) = 𝑋)
3028, 29eleqtrrd 2733 . . . . . 6 ((𝜑𝑥𝑋) → 𝑥 ∈ ((cls‘𝐽)‘𝐴))
311, 3istps 20786 . . . . . . . . 9 (𝑉 ∈ TopSp ↔ 𝐽 ∈ (TopOn‘𝑋))
326, 31sylib 208 . . . . . . . 8 (𝜑𝐽 ∈ (TopOn‘𝑋))
3332adantr 480 . . . . . . 7 ((𝜑𝑥𝑋) → 𝐽 ∈ (TopOn‘𝑋))
3410adantr 480 . . . . . . 7 ((𝜑𝑥𝑋) → 𝐴𝑋)
35 trnei 21743 . . . . . . 7 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐴𝑋𝑥𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (Fil‘𝐴)))
3633, 34, 28, 35syl3anc 1366 . . . . . 6 ((𝜑𝑥𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (Fil‘𝐴)))
3730, 36mpbid 222 . . . . 5 ((𝜑𝑥𝑋) → (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (Fil‘𝐴))
38 filfbas 21699 . . . . 5 ((((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (Fil‘𝐴) → (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (fBas‘𝐴))
3937, 38syl 17 . . . 4 ((𝜑𝑥𝑋) → (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (fBas‘𝐴))
4024adantr 480 . . . 4 ((𝜑𝑥𝑋) → 𝐹:𝐴𝑌)
41 fmval 21794 . . . 4 ((𝑌 ∈ V ∧ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (fBas‘𝐴) ∧ 𝐹:𝐴𝑌) → ((𝑌 FilMap 𝐹)‘(((nei‘𝐽)‘{𝑥}) ↾t 𝐴)) = (𝑌filGenran (𝑎 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑎))))
4227, 39, 40, 41syl3anc 1366 . . 3 ((𝜑𝑥𝑋) → ((𝑌 FilMap 𝐹)‘(((nei‘𝐽)‘{𝑥}) ↾t 𝐴)) = (𝑌filGenran (𝑎 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑎))))
4315adantr 480 . . . . 5 ((𝜑𝑥𝑋) → 𝑇 ∈ (UnifOn‘𝐴))
4411adantr 480 . . . . 5 ((𝜑𝑥𝑋) → 𝐹 ∈ (𝑇 Cnu𝑈))
45 ucnextcn.s . . . . . . . . . . 11 𝑆 = (UnifSt‘𝑉)
461, 45, 3isusp 22112 . . . . . . . . . 10 (𝑉 ∈ UnifSp ↔ (𝑆 ∈ (UnifOn‘𝑋) ∧ 𝐽 = (unifTop‘𝑆)))
4712, 46sylib 208 . . . . . . . . 9 (𝜑 → (𝑆 ∈ (UnifOn‘𝑋) ∧ 𝐽 = (unifTop‘𝑆)))
4847simpld 474 . . . . . . . 8 (𝜑𝑆 ∈ (UnifOn‘𝑋))
4948adantr 480 . . . . . . 7 ((𝜑𝑥𝑋) → 𝑆 ∈ (UnifOn‘𝑋))
5012adantr 480 . . . . . . . 8 ((𝜑𝑥𝑋) → 𝑉 ∈ UnifSp)
516adantr 480 . . . . . . . 8 ((𝜑𝑥𝑋) → 𝑉 ∈ TopSp)
521, 3, 45neipcfilu 22147 . . . . . . . 8 ((𝑉 ∈ UnifSp ∧ 𝑉 ∈ TopSp ∧ 𝑥𝑋) → ((nei‘𝐽)‘{𝑥}) ∈ (CauFilu𝑆))
5350, 51, 28, 52syl3anc 1366 . . . . . . 7 ((𝜑𝑥𝑋) → ((nei‘𝐽)‘{𝑥}) ∈ (CauFilu𝑆))
54 0nelfb 21682 . . . . . . . 8 ((((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (fBas‘𝐴) → ¬ ∅ ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴))
5539, 54syl 17 . . . . . . 7 ((𝜑𝑥𝑋) → ¬ ∅ ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴))
56 trcfilu 22145 . . . . . . 7 ((𝑆 ∈ (UnifOn‘𝑋) ∧ (((nei‘𝐽)‘{𝑥}) ∈ (CauFilu𝑆) ∧ ¬ ∅ ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴)) ∧ 𝐴𝑋) → (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (CauFilu‘(𝑆t (𝐴 × 𝐴))))
5749, 53, 55, 34, 56syl121anc 1371 . . . . . 6 ((𝜑𝑥𝑋) → (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (CauFilu‘(𝑆t (𝐴 × 𝐴))))
5843elfvexd 6260 . . . . . . 7 ((𝜑𝑥𝑋) → 𝐴 ∈ V)
59 ressuss 22114 . . . . . . . . 9 (𝐴 ∈ V → (UnifSt‘(𝑉s 𝐴)) = ((UnifSt‘𝑉) ↾t (𝐴 × 𝐴)))
6045oveq1i 6700 . . . . . . . . 9 (𝑆t (𝐴 × 𝐴)) = ((UnifSt‘𝑉) ↾t (𝐴 × 𝐴))
6159, 13, 603eqtr4g 2710 . . . . . . . 8 (𝐴 ∈ V → 𝑇 = (𝑆t (𝐴 × 𝐴)))
6261fveq2d 6233 . . . . . . 7 (𝐴 ∈ V → (CauFilu𝑇) = (CauFilu‘(𝑆t (𝐴 × 𝐴))))
6358, 62syl 17 . . . . . 6 ((𝜑𝑥𝑋) → (CauFilu𝑇) = (CauFilu‘(𝑆t (𝐴 × 𝐴))))
6457, 63eleqtrrd 2733 . . . . 5 ((𝜑𝑥𝑋) → (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (CauFilu𝑇))
65 imaeq2 5497 . . . . . . 7 (𝑎 = 𝑏 → (𝐹𝑎) = (𝐹𝑏))
6665cbvmptv 4783 . . . . . 6 (𝑎 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑎)) = (𝑏 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑏))
6766rneqi 5384 . . . . 5 ran (𝑎 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑎)) = ran (𝑏 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑏))
6843, 26, 44, 64, 67fmucnd 22143 . . . 4 ((𝜑𝑥𝑋) → ran (𝑎 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑎)) ∈ (CauFilu𝑈))
69 cfilufg 22144 . . . 4 ((𝑈 ∈ (UnifOn‘𝑌) ∧ ran (𝑎 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑎)) ∈ (CauFilu𝑈)) → (𝑌filGenran (𝑎 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑎))) ∈ (CauFilu𝑈))
7026, 68, 69syl2anc 694 . . 3 ((𝜑𝑥𝑋) → (𝑌filGenran (𝑎 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑎))) ∈ (CauFilu𝑈))
7142, 70eqeltrd 2730 . 2 ((𝜑𝑥𝑋) → ((𝑌 FilMap 𝐹)‘(((nei‘𝐽)‘{𝑥}) ↾t 𝐴)) ∈ (CauFilu𝑈))
721, 2, 3, 4, 5, 6, 7, 8, 9, 10, 24, 25, 71cnextucn 22154 1 (𝜑 → ((𝐽CnExt𝐾)‘𝐹) ∈ (𝐽 Cn 𝐾))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wa 383   = wceq 1523  wcel 2030  wral 2941  wrex 2942  Vcvv 3231  wss 3607  c0 3948  {csn 4210   class class class wbr 4685  cmpt 4762   × cxp 5141  ran crn 5144  cima 5146  wf 5922  cfv 5926  (class class class)co 6690  Basecbs 15904  s cress 15905  t crest 16128  TopOpenctopn 16129  fBascfbas 19782  filGencfg 19783  TopOnctopon 20763  TopSpctps 20784  clsccl 20870  neicnei 20949   Cn ccn 21076  Hauscha 21160  Filcfil 21696   FilMap cfm 21784  CnExtccnext 21910  UnifOncust 22050  unifTopcutop 22081  UnifStcuss 22104  UnifSpcusp 22105   Cnucucn 22126  CauFiluccfilu 22137  CUnifSpccusp 22148
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991  ax-cnex 10030  ax-resscn 10031  ax-1cn 10032  ax-icn 10033  ax-addcl 10034  ax-addrcl 10035  ax-mulcl 10036  ax-mulrcl 10037  ax-mulcom 10038  ax-addass 10039  ax-mulass 10040  ax-distr 10041  ax-i2m1 10042  ax-1ne0 10043  ax-1rid 10044  ax-rnegex 10045  ax-rrecex 10046  ax-cnre 10047  ax-pre-lttri 10048  ax-pre-lttrn 10049  ax-pre-ltadd 10050  ax-pre-mulgt0 10051
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-nel 2927  df-ral 2946  df-rex 2947  df-reu 2948  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-int 4508  df-iun 4554  df-iin 4555  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-we 5104  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-pred 5718  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-riota 6651  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-om 7108  df-1st 7210  df-2nd 7211  df-wrecs 7452  df-recs 7513  df-rdg 7551  df-1o 7605  df-oadd 7609  df-er 7787  df-map 7901  df-pm 7902  df-en 7998  df-dom 7999  df-sdom 8000  df-fin 8001  df-fi 8358  df-pnf 10114  df-mnf 10115  df-xr 10116  df-ltxr 10117  df-le 10118  df-sub 10306  df-neg 10307  df-nn 11059  df-2 11117  df-3 11118  df-4 11119  df-5 11120  df-6 11121  df-7 11122  df-8 11123  df-9 11124  df-n0 11331  df-z 11416  df-dec 11532  df-ndx 15907  df-slot 15908  df-base 15910  df-sets 15911  df-ress 15912  df-unif 16012  df-rest 16130  df-topgen 16151  df-fbas 19791  df-fg 19792  df-top 20747  df-topon 20764  df-topsp 20785  df-bases 20798  df-cld 20871  df-ntr 20872  df-cls 20873  df-nei 20950  df-cn 21079  df-cnp 21080  df-haus 21167  df-reg 21168  df-tx 21413  df-fil 21697  df-fm 21789  df-flim 21790  df-flf 21791  df-cnext 21911  df-ust 22051  df-utop 22082  df-uss 22107  df-usp 22108  df-ucn 22127  df-cfilu 22138  df-cusp 22149
This theorem is referenced by:  rrhcn  30169
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