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Theorem cnplimc 19643
Description: A function is continuous at  B iff its limit at  B equals the value of the function there. (Contributed by Mario Carneiro, 28-Dec-2016.)
Hypotheses
Ref Expression
cnplimc.k  |-  K  =  ( TopOpen ` fld )
cnplimc.j  |-  J  =  ( Kt  A )
Assertion
Ref Expression
cnplimc  |-  ( ( A  C_  CC  /\  B  e.  A )  ->  ( F  e.  ( ( J  CnP  K ) `  B )  <->  ( F : A --> CC  /\  ( F `  B )  e.  ( F lim CC  B
) ) ) )

Proof of Theorem cnplimc
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 cnplimc.j . . . . 5  |-  J  =  ( Kt  A )
2 cnplimc.k . . . . . . 7  |-  K  =  ( TopOpen ` fld )
32cnfldtopon 18690 . . . . . 6  |-  K  e.  (TopOn `  CC )
4 simpl 444 . . . . . 6  |-  ( ( A  C_  CC  /\  B  e.  A )  ->  A  C_  CC )
5 resttopon 17149 . . . . . 6  |-  ( ( K  e.  (TopOn `  CC )  /\  A  C_  CC )  ->  ( Kt  A )  e.  (TopOn `  A ) )
63, 4, 5sylancr 645 . . . . 5  |-  ( ( A  C_  CC  /\  B  e.  A )  ->  ( Kt  A )  e.  (TopOn `  A ) )
71, 6syl5eqel 2473 . . . 4  |-  ( ( A  C_  CC  /\  B  e.  A )  ->  J  e.  (TopOn `  A )
)
8 cnpf2 17238 . . . . 5  |-  ( ( J  e.  (TopOn `  A )  /\  K  e.  (TopOn `  CC )  /\  F  e.  (
( J  CnP  K
) `  B )
)  ->  F : A
--> CC )
983expia 1155 . . . 4  |-  ( ( J  e.  (TopOn `  A )  /\  K  e.  (TopOn `  CC )
)  ->  ( F  e.  ( ( J  CnP  K ) `  B )  ->  F : A --> CC ) )
107, 3, 9sylancl 644 . . 3  |-  ( ( A  C_  CC  /\  B  e.  A )  ->  ( F  e.  ( ( J  CnP  K ) `  B )  ->  F : A --> CC ) )
1110pm4.71rd 617 . 2  |-  ( ( A  C_  CC  /\  B  e.  A )  ->  ( F  e.  ( ( J  CnP  K ) `  B )  <->  ( F : A --> CC  /\  F  e.  ( ( J  CnP  K ) `  B ) ) ) )
12 simpr 448 . . . . . . 7  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  F : A
--> CC )
13 simplr 732 . . . . . . . . . 10  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  B  e.  A )
1413snssd 3888 . . . . . . . . 9  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  { B }  C_  A )
15 ssequn2 3465 . . . . . . . . 9  |-  ( { B }  C_  A  <->  ( A  u.  { B } )  =  A )
1614, 15sylib 189 . . . . . . . 8  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  ( A  u.  { B }
)  =  A )
1716feq2d 5523 . . . . . . 7  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  ( F : ( A  u.  { B } ) --> CC  <->  F : A --> CC ) )
1812, 17mpbird 224 . . . . . 6  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  F :
( A  u.  { B } ) --> CC )
1918feqmptd 5720 . . . . 5  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  F  =  ( x  e.  ( A  u.  { B } )  |->  ( F `
 x ) ) )
2016oveq2d 6038 . . . . . . . 8  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  ( Kt  ( A  u.  { B } ) )  =  ( Kt  A ) )
2120, 1syl6reqr 2440 . . . . . . 7  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  J  =  ( Kt  ( A  u.  { B } ) ) )
2221oveq1d 6037 . . . . . 6  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  ( J  CnP  K )  =  ( ( Kt  ( A  u.  { B }
) )  CnP  K
) )
2322fveq1d 5672 . . . . 5  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  ( ( J  CnP  K ) `
 B )  =  ( ( ( Kt  ( A  u.  { B } ) )  CnP 
K ) `  B
) )
2419, 23eleq12d 2457 . . . 4  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  ( F  e.  ( ( J  CnP  K ) `  B )  <->  ( x  e.  ( A  u.  { B } )  |->  ( F `
 x ) )  e.  ( ( ( Kt  ( A  u.  { B } ) )  CnP 
K ) `  B
) ) )
25 eqid 2389 . . . . 5  |-  ( Kt  ( A  u.  { B } ) )  =  ( Kt  ( A  u.  { B } ) )
26 ifid 3716 . . . . . . 7  |-  if ( x  =  B , 
( F `  x
) ,  ( F `
 x ) )  =  ( F `  x )
27 fveq2 5670 . . . . . . . . 9  |-  ( x  =  B  ->  ( F `  x )  =  ( F `  B ) )
2827adantl 453 . . . . . . . 8  |-  ( ( x  e.  ( A  u.  { B }
)  /\  x  =  B )  ->  ( F `  x )  =  ( F `  B ) )
2928ifeq1da 3709 . . . . . . 7  |-  ( x  e.  ( A  u.  { B } )  ->  if ( x  =  B ,  ( F `  x ) ,  ( F `  x ) )  =  if ( x  =  B , 
( F `  B
) ,  ( F `
 x ) ) )
3026, 29syl5eqr 2435 . . . . . 6  |-  ( x  e.  ( A  u.  { B } )  -> 
( F `  x
)  =  if ( x  =  B , 
( F `  B
) ,  ( F `
 x ) ) )
3130mpteq2ia 4234 . . . . 5  |-  ( x  e.  ( A  u.  { B } )  |->  ( F `  x ) )  =  ( x  e.  ( A  u.  { B } )  |->  if ( x  =  B ,  ( F `  B ) ,  ( F `  x ) ) )
32 simpll 731 . . . . 5  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  A  C_  CC )
3332, 13sseldd 3294 . . . . 5  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  B  e.  CC )
3425, 2, 31, 12, 32, 33ellimc 19629 . . . 4  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  ( ( F `  B )  e.  ( F lim CC  B )  <->  ( x  e.  ( A  u.  { B } )  |->  ( F `
 x ) )  e.  ( ( ( Kt  ( A  u.  { B } ) )  CnP 
K ) `  B
) ) )
3524, 34bitr4d 248 . . 3  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  ( F  e.  ( ( J  CnP  K ) `  B )  <->  ( F `  B )  e.  ( F lim CC  B ) ) )
3635pm5.32da 623 . 2  |-  ( ( A  C_  CC  /\  B  e.  A )  ->  (
( F : A --> CC  /\  F  e.  ( ( J  CnP  K
) `  B )
)  <->  ( F : A
--> CC  /\  ( F `
 B )  e.  ( F lim CC  B
) ) ) )
3711, 36bitrd 245 1  |-  ( ( A  C_  CC  /\  B  e.  A )  ->  ( F  e.  ( ( J  CnP  K ) `  B )  <->  ( F : A --> CC  /\  ( F `  B )  e.  ( F lim CC  B
) ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 177    /\ wa 359    = wceq 1649    e. wcel 1717    u. cun 3263    C_ wss 3265   ifcif 3684   {csn 3759    e. cmpt 4209   -->wf 5392   ` cfv 5396  (class class class)co 6022   CCcc 8923   ↾t crest 13577   TopOpenctopn 13578  ℂfldccnfld 16628  TopOnctopon 16884    CnP ccnp 17213   lim CC climc 19618
This theorem is referenced by:  cnlimc  19644  dvcnp2  19675  dvmulbr  19694  dvcobr  19701
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1661  ax-8 1682  ax-13 1719  ax-14 1721  ax-6 1736  ax-7 1741  ax-11 1753  ax-12 1939  ax-ext 2370  ax-rep 4263  ax-sep 4273  ax-nul 4281  ax-pow 4320  ax-pr 4346  ax-un 4643  ax-cnex 8981  ax-resscn 8982  ax-1cn 8983  ax-icn 8984  ax-addcl 8985  ax-addrcl 8986  ax-mulcl 8987  ax-mulrcl 8988  ax-mulcom 8989  ax-addass 8990  ax-mulass 8991  ax-distr 8992  ax-i2m1 8993  ax-1ne0 8994  ax-1rid 8995  ax-rnegex 8996  ax-rrecex 8997  ax-cnre 8998  ax-pre-lttri 8999  ax-pre-lttrn 9000  ax-pre-ltadd 9001  ax-pre-mulgt0 9002  ax-pre-sup 9003
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3or 937  df-3an 938  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-eu 2244  df-mo 2245  df-clab 2376  df-cleq 2382  df-clel 2385  df-nfc 2514  df-ne 2554  df-nel 2555  df-ral 2656  df-rex 2657  df-reu 2658  df-rmo 2659  df-rab 2660  df-v 2903  df-sbc 3107  df-csb 3197  df-dif 3268  df-un 3270  df-in 3272  df-ss 3279  df-pss 3281  df-nul 3574  df-if 3685  df-pw 3746  df-sn 3765  df-pr 3766  df-tp 3767  df-op 3768  df-uni 3960  df-int 3995  df-iun 4039  df-br 4156  df-opab 4210  df-mpt 4211  df-tr 4246  df-eprel 4437  df-id 4441  df-po 4446  df-so 4447  df-fr 4484  df-we 4486  df-ord 4527  df-on 4528  df-lim 4529  df-suc 4530  df-om 4788  df-xp 4826  df-rel 4827  df-cnv 4828  df-co 4829  df-dm 4830  df-rn 4831  df-res 4832  df-ima 4833  df-iota 5360  df-fun 5398  df-fn 5399  df-f 5400  df-f1 5401  df-fo 5402  df-f1o 5403  df-fv 5404  df-ov 6025  df-oprab 6026  df-mpt2 6027  df-1st 6290  df-2nd 6291  df-riota 6487  df-recs 6571  df-rdg 6606  df-1o 6662  df-oadd 6666  df-er 6843  df-map 6958  df-pm 6959  df-en 7048  df-dom 7049  df-sdom 7050  df-fin 7051  df-fi 7353  df-sup 7383  df-pnf 9057  df-mnf 9058  df-xr 9059  df-ltxr 9060  df-le 9061  df-sub 9227  df-neg 9228  df-div 9612  df-nn 9935  df-2 9992  df-3 9993  df-4 9994  df-5 9995  df-6 9996  df-7 9997  df-8 9998  df-9 9999  df-10 10000  df-n0 10156  df-z 10217  df-dec 10317  df-uz 10423  df-q 10509  df-rp 10547  df-xneg 10644  df-xadd 10645  df-xmul 10646  df-fz 10978  df-seq 11253  df-exp 11312  df-cj 11833  df-re 11834  df-im 11835  df-sqr 11969  df-abs 11970  df-struct 13400  df-ndx 13401  df-slot 13402  df-base 13403  df-plusg 13471  df-mulr 13472  df-starv 13473  df-tset 13477  df-ple 13478  df-ds 13480  df-unif 13481  df-rest 13579  df-topn 13580  df-topgen 13596  df-xmet 16621  df-met 16622  df-bl 16623  df-mopn 16624  df-cnfld 16629  df-top 16888  df-bases 16890  df-topon 16891  df-topsp 16892  df-cnp 17216  df-xms 18261  df-ms 18262  df-limc 19622
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