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Theorem ucnextcn 22905
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 22865 . . . . . 6 ((𝑉 ∈ UnifSp ∧ 𝐴𝑋) → 𝑇 ∈ (UnifOn‘𝐴))
1512, 10, 14syl2anc 586 . . . . 5 (𝜑𝑇 ∈ (UnifOn‘𝐴))
16 cuspusp 22901 . . . . . . . 8 (𝑊 ∈ CUnifSp → 𝑊 ∈ UnifSp)
178, 16syl 17 . . . . . . 7 (𝜑𝑊 ∈ UnifSp)
182, 5, 4isusp 22862 . . . . . . 7 (𝑊 ∈ UnifSp ↔ (𝑈 ∈ (UnifOn‘𝑌) ∧ 𝐾 = (unifTop‘𝑈)))
1917, 18sylib 220 . . . . . 6 (𝜑 → (𝑈 ∈ (UnifOn‘𝑌) ∧ 𝐾 = (unifTop‘𝑈)))
2019simpld 497 . . . . 5 (𝜑𝑈 ∈ (UnifOn‘𝑌))
21 isucn 22879 . . . . 5 ((𝑇 ∈ (UnifOn‘𝐴) ∧ 𝑈 ∈ (UnifOn‘𝑌)) → (𝐹 ∈ (𝑇 Cnu𝑈) ↔ (𝐹:𝐴𝑌 ∧ ∀𝑤𝑈𝑣𝑇𝑦𝐴𝑧𝐴 (𝑦𝑣𝑧 → (𝐹𝑦)𝑤(𝐹𝑧)))))
2215, 20, 21syl2anc 586 . . . 4 (𝜑 → (𝐹 ∈ (𝑇 Cnu𝑈) ↔ (𝐹:𝐴𝑌 ∧ ∀𝑤𝑈𝑣𝑇𝑦𝐴𝑧𝐴 (𝑦𝑣𝑧 → (𝐹𝑦)𝑤(𝐹𝑧)))))
2311, 22mpbid 234 . . 3 (𝜑 → (𝐹:𝐴𝑌 ∧ ∀𝑤𝑈𝑣𝑇𝑦𝐴𝑧𝐴 (𝑦𝑣𝑧 → (𝐹𝑦)𝑤(𝐹𝑧))))
2423simpld 497 . 2 (𝜑𝐹:𝐴𝑌)
25 ucnextcn.c . 2 (𝜑 → ((cls‘𝐽)‘𝐴) = 𝑋)
2620adantr 483 . . . . 5 ((𝜑𝑥𝑋) → 𝑈 ∈ (UnifOn‘𝑌))
2726elfvexd 6697 . . . 4 ((𝜑𝑥𝑋) → 𝑌 ∈ V)
28 simpr 487 . . . . . . 7 ((𝜑𝑥𝑋) → 𝑥𝑋)
2925adantr 483 . . . . . . 7 ((𝜑𝑥𝑋) → ((cls‘𝐽)‘𝐴) = 𝑋)
3028, 29eleqtrrd 2914 . . . . . 6 ((𝜑𝑥𝑋) → 𝑥 ∈ ((cls‘𝐽)‘𝐴))
311, 3istps 21534 . . . . . . . . 9 (𝑉 ∈ TopSp ↔ 𝐽 ∈ (TopOn‘𝑋))
326, 31sylib 220 . . . . . . . 8 (𝜑𝐽 ∈ (TopOn‘𝑋))
3332adantr 483 . . . . . . 7 ((𝜑𝑥𝑋) → 𝐽 ∈ (TopOn‘𝑋))
3410adantr 483 . . . . . . 7 ((𝜑𝑥𝑋) → 𝐴𝑋)
35 trnei 22492 . . . . . . 7 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐴𝑋𝑥𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (Fil‘𝐴)))
3633, 34, 28, 35syl3anc 1365 . . . . . 6 ((𝜑𝑥𝑋) → (𝑥 ∈ ((cls‘𝐽)‘𝐴) ↔ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (Fil‘𝐴)))
3730, 36mpbid 234 . . . . 5 ((𝜑𝑥𝑋) → (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (Fil‘𝐴))
38 filfbas 22448 . . . . 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 483 . . . 4 ((𝜑𝑥𝑋) → 𝐹:𝐴𝑌)
41 fmval 22543 . . . 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 1365 . . 3 ((𝜑𝑥𝑋) → ((𝑌 FilMap 𝐹)‘(((nei‘𝐽)‘{𝑥}) ↾t 𝐴)) = (𝑌filGenran (𝑎 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑎))))
4315adantr 483 . . . . 5 ((𝜑𝑥𝑋) → 𝑇 ∈ (UnifOn‘𝐴))
4411adantr 483 . . . . 5 ((𝜑𝑥𝑋) → 𝐹 ∈ (𝑇 Cnu𝑈))
45 ucnextcn.s . . . . . . . . . . 11 𝑆 = (UnifSt‘𝑉)
461, 45, 3isusp 22862 . . . . . . . . . 10 (𝑉 ∈ UnifSp ↔ (𝑆 ∈ (UnifOn‘𝑋) ∧ 𝐽 = (unifTop‘𝑆)))
4712, 46sylib 220 . . . . . . . . 9 (𝜑 → (𝑆 ∈ (UnifOn‘𝑋) ∧ 𝐽 = (unifTop‘𝑆)))
4847simpld 497 . . . . . . . 8 (𝜑𝑆 ∈ (UnifOn‘𝑋))
4948adantr 483 . . . . . . 7 ((𝜑𝑥𝑋) → 𝑆 ∈ (UnifOn‘𝑋))
5012adantr 483 . . . . . . . 8 ((𝜑𝑥𝑋) → 𝑉 ∈ UnifSp)
516adantr 483 . . . . . . . 8 ((𝜑𝑥𝑋) → 𝑉 ∈ TopSp)
521, 3, 45neipcfilu 22897 . . . . . . . 8 ((𝑉 ∈ UnifSp ∧ 𝑉 ∈ TopSp ∧ 𝑥𝑋) → ((nei‘𝐽)‘{𝑥}) ∈ (CauFilu𝑆))
5350, 51, 28, 52syl3anc 1365 . . . . . . 7 ((𝜑𝑥𝑋) → ((nei‘𝐽)‘{𝑥}) ∈ (CauFilu𝑆))
54 0nelfb 22431 . . . . . . . 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 22895 . . . . . . 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 1369 . . . . . 6 ((𝜑𝑥𝑋) → (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (CauFilu‘(𝑆t (𝐴 × 𝐴))))
5843elfvexd 6697 . . . . . . 7 ((𝜑𝑥𝑋) → 𝐴 ∈ V)
59 ressuss 22864 . . . . . . . . 9 (𝐴 ∈ V → (UnifSt‘(𝑉s 𝐴)) = ((UnifSt‘𝑉) ↾t (𝐴 × 𝐴)))
6045oveq1i 7158 . . . . . . . . 9 (𝑆t (𝐴 × 𝐴)) = ((UnifSt‘𝑉) ↾t (𝐴 × 𝐴))
6159, 13, 603eqtr4g 2879 . . . . . . . 8 (𝐴 ∈ V → 𝑇 = (𝑆t (𝐴 × 𝐴)))
6261fveq2d 6667 . . . . . . 7 (𝐴 ∈ V → (CauFilu𝑇) = (CauFilu‘(𝑆t (𝐴 × 𝐴))))
6358, 62syl 17 . . . . . 6 ((𝜑𝑥𝑋) → (CauFilu𝑇) = (CauFilu‘(𝑆t (𝐴 × 𝐴))))
6457, 63eleqtrrd 2914 . . . . 5 ((𝜑𝑥𝑋) → (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ∈ (CauFilu𝑇))
65 imaeq2 5918 . . . . . . 7 (𝑎 = 𝑏 → (𝐹𝑎) = (𝐹𝑏))
6665cbvmptv 5160 . . . . . 6 (𝑎 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑎)) = (𝑏 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑏))
6766rneqi 5800 . . . . 5 ran (𝑎 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑎)) = ran (𝑏 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑏))
6843, 26, 44, 64, 67fmucnd 22893 . . . 4 ((𝜑𝑥𝑋) → ran (𝑎 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑎)) ∈ (CauFilu𝑈))
69 cfilufg 22894 . . . 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 586 . . 3 ((𝜑𝑥𝑋) → (𝑌filGenran (𝑎 ∈ (((nei‘𝐽)‘{𝑥}) ↾t 𝐴) ↦ (𝐹𝑎))) ∈ (CauFilu𝑈))
7142, 70eqeltrd 2911 . 2 ((𝜑𝑥𝑋) → ((𝑌 FilMap 𝐹)‘(((nei‘𝐽)‘{𝑥}) ↾t 𝐴)) ∈ (CauFilu𝑈))
721, 2, 3, 4, 5, 6, 7, 8, 9, 10, 24, 25, 71cnextucn 22904 1 (𝜑 → ((𝐽CnExt𝐾)‘𝐹) ∈ (𝐽 Cn 𝐾))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 208  wa 398   = wceq 1530  wcel 2107  wral 3136  wrex 3137  Vcvv 3493  wss 3934  c0 4289  {csn 4559   class class class wbr 5057  cmpt 5137   × cxp 5546  ran crn 5549  cima 5551  wf 6344  cfv 6348  (class class class)co 7148  Basecbs 16475  s cress 16476  t crest 16686  TopOpenctopn 16687  fBascfbas 20525  filGencfg 20526  TopOnctopon 21510  TopSpctps 21532  clsccl 21618  neicnei 21697   Cn ccn 21824  Hauscha 21908  Filcfil 22445   FilMap cfm 22533  CnExtccnext 22659  UnifOncust 22800  unifTopcutop 22831  UnifStcuss 22854  UnifSpcusp 22855   Cnucucn 22876  CauFiluccfilu 22887  CUnifSpccusp 22898
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2153  ax-12 2169  ax-ext 2791  ax-rep 5181  ax-sep 5194  ax-nul 5201  ax-pow 5257  ax-pr 5320  ax-un 7453  ax-cnex 10585  ax-resscn 10586  ax-1cn 10587  ax-icn 10588  ax-addcl 10589  ax-addrcl 10590  ax-mulcl 10591  ax-mulrcl 10592  ax-mulcom 10593  ax-addass 10594  ax-mulass 10595  ax-distr 10596  ax-i2m1 10597  ax-1ne0 10598  ax-1rid 10599  ax-rnegex 10600  ax-rrecex 10601  ax-cnre 10602  ax-pre-lttri 10603  ax-pre-lttrn 10604  ax-pre-ltadd 10605  ax-pre-mulgt0 10606
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1082  df-3an 1083  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-mo 2616  df-eu 2648  df-clab 2798  df-cleq 2812  df-clel 2891  df-nfc 2961  df-ne 3015  df-nel 3122  df-ral 3141  df-rex 3142  df-reu 3143  df-rab 3145  df-v 3495  df-sbc 3771  df-csb 3882  df-dif 3937  df-un 3939  df-in 3941  df-ss 3950  df-pss 3952  df-nul 4290  df-if 4466  df-pw 4539  df-sn 4560  df-pr 4562  df-tp 4564  df-op 4566  df-uni 4831  df-int 4868  df-iun 4912  df-iin 4913  df-br 5058  df-opab 5120  df-mpt 5138  df-tr 5164  df-id 5453  df-eprel 5458  df-po 5467  df-so 5468  df-fr 5507  df-we 5509  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-ima 5561  df-pred 6141  df-ord 6187  df-on 6188  df-lim 6189  df-suc 6190  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-f1 6353  df-fo 6354  df-f1o 6355  df-fv 6356  df-riota 7106  df-ov 7151  df-oprab 7152  df-mpo 7153  df-om 7573  df-1st 7681  df-2nd 7682  df-wrecs 7939  df-recs 8000  df-rdg 8038  df-1o 8094  df-oadd 8098  df-er 8281  df-map 8400  df-pm 8401  df-en 8502  df-dom 8503  df-sdom 8504  df-fin 8505  df-fi 8867  df-pnf 10669  df-mnf 10670  df-xr 10671  df-ltxr 10672  df-le 10673  df-sub 10864  df-neg 10865  df-nn 11631  df-2 11692  df-3 11693  df-4 11694  df-5 11695  df-6 11696  df-7 11697  df-8 11698  df-9 11699  df-n0 11890  df-z 11974  df-dec 12091  df-ndx 16478  df-slot 16479  df-base 16481  df-sets 16482  df-ress 16483  df-unif 16580  df-rest 16688  df-topgen 16709  df-fbas 20534  df-fg 20535  df-top 21494  df-topon 21511  df-topsp 21533  df-bases 21546  df-cld 21619  df-ntr 21620  df-cls 21621  df-nei 21698  df-cn 21827  df-cnp 21828  df-haus 21915  df-reg 21916  df-tx 22162  df-fil 22446  df-fm 22538  df-flim 22539  df-flf 22540  df-cnext 22660  df-ust 22801  df-utop 22832  df-uss 22857  df-usp 22858  df-ucn 22877  df-cfilu 22888  df-cusp 22899
This theorem is referenced by:  rrhcn  31226
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