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Theorem cnplimc 19237
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 18292 . . . . . 6  |-  K  e.  (TopOn `  CC )
4 simpl 443 . . . . . 6  |-  ( ( A  C_  CC  /\  B  e.  A )  ->  A  C_  CC )
5 resttopon 16892 . . . . . 6  |-  ( ( K  e.  (TopOn `  CC )  /\  A  C_  CC )  ->  ( Kt  A )  e.  (TopOn `  A ) )
63, 4, 5sylancr 644 . . . . 5  |-  ( ( A  C_  CC  /\  B  e.  A )  ->  ( Kt  A )  e.  (TopOn `  A ) )
71, 6syl5eqel 2367 . . . 4  |-  ( ( A  C_  CC  /\  B  e.  A )  ->  J  e.  (TopOn `  A )
)
8 cnpf2 16980 . . . . 5  |-  ( ( J  e.  (TopOn `  A )  /\  K  e.  (TopOn `  CC )  /\  F  e.  (
( J  CnP  K
) `  B )
)  ->  F : A
--> CC )
983expia 1153 . . . 4  |-  ( ( J  e.  (TopOn `  A )  /\  K  e.  (TopOn `  CC )
)  ->  ( F  e.  ( ( J  CnP  K ) `  B )  ->  F : A --> CC ) )
107, 3, 9sylancl 643 . . 3  |-  ( ( A  C_  CC  /\  B  e.  A )  ->  ( F  e.  ( ( J  CnP  K ) `  B )  ->  F : A --> CC ) )
1110pm4.71rd 616 . 2  |-  ( ( A  C_  CC  /\  B  e.  A )  ->  ( F  e.  ( ( J  CnP  K ) `  B )  <->  ( F : A --> CC  /\  F  e.  ( ( J  CnP  K ) `  B ) ) ) )
12 simpr 447 . . . . . . 7  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  F : A
--> CC )
13 simplr 731 . . . . . . . . . 10  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  B  e.  A )
1413snssd 3760 . . . . . . . . 9  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  { B }  C_  A )
15 ssequn2 3348 . . . . . . . . 9  |-  ( { B }  C_  A  <->  ( A  u.  { B } )  =  A )
1614, 15sylib 188 . . . . . . . 8  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  ( A  u.  { B }
)  =  A )
1716feq2d 5380 . . . . . . 7  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  ( F : ( A  u.  { B } ) --> CC  <->  F : A --> CC ) )
1812, 17mpbird 223 . . . . . 6  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  F :
( A  u.  { B } ) --> CC )
1918feqmptd 5575 . . . . 5  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  F  =  ( x  e.  ( A  u.  { B } )  |->  ( F `
 x ) ) )
2016oveq2d 5874 . . . . . . . 8  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  ( Kt  ( A  u.  { B } ) )  =  ( Kt  A ) )
2120, 1syl6reqr 2334 . . . . . . 7  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  J  =  ( Kt  ( A  u.  { B } ) ) )
2221oveq1d 5873 . . . . . 6  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  ( J  CnP  K )  =  ( ( Kt  ( A  u.  { B }
) )  CnP  K
) )
2322fveq1d 5527 . . . . 5  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  ( ( J  CnP  K ) `
 B )  =  ( ( ( Kt  ( A  u.  { B } ) )  CnP 
K ) `  B
) )
2419, 23eleq12d 2351 . . . 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 2283 . . . . 5  |-  ( Kt  ( A  u.  { B } ) )  =  ( Kt  ( A  u.  { B } ) )
26 ifid 3597 . . . . . . 7  |-  if ( x  =  B , 
( F `  x
) ,  ( F `
 x ) )  =  ( F `  x )
27 fveq2 5525 . . . . . . . . 9  |-  ( x  =  B  ->  ( F `  x )  =  ( F `  B ) )
2827adantl 452 . . . . . . . 8  |-  ( ( x  e.  ( A  u.  { B }
)  /\  x  =  B )  ->  ( F `  x )  =  ( F `  B ) )
2928ifeq1da 3590 . . . . . . 7  |-  ( x  e.  ( A  u.  { B } )  ->  if ( x  =  B ,  ( F `  x ) ,  ( F `  x ) )  =  if ( x  =  B , 
( F `  B
) ,  ( F `
 x ) ) )
3026, 29syl5eqr 2329 . . . . . 6  |-  ( x  e.  ( A  u.  { B } )  -> 
( F `  x
)  =  if ( x  =  B , 
( F `  B
) ,  ( F `
 x ) ) )
3130mpteq2ia 4102 . . . . 5  |-  ( x  e.  ( A  u.  { B } )  |->  ( F `  x ) )  =  ( x  e.  ( A  u.  { B } )  |->  if ( x  =  B ,  ( F `  B ) ,  ( F `  x ) ) )
32 simpll 730 . . . . 5  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  A  C_  CC )
3332, 13sseldd 3181 . . . . 5  |-  ( ( ( A  C_  CC  /\  B  e.  A )  /\  F : A --> CC )  ->  B  e.  CC )
3425, 2, 31, 12, 32, 33ellimc 19223 . . . 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 247 . . 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 622 . 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 244 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 176    /\ wa 358    = wceq 1623    e. wcel 1684    u. cun 3150    C_ wss 3152   ifcif 3565   {csn 3640    e. cmpt 4077   -->wf 5251   ` cfv 5255  (class class class)co 5858   CCcc 8735   ↾t crest 13325   TopOpenctopn 13326  ℂfldccnfld 16377  TopOnctopon 16632    CnP ccnp 16955   lim CC climc 19212
This theorem is referenced by:  cnlimc  19238  dvcnp2  19269  dvmulbr  19288  dvcobr  19295
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-rep 4131  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512  ax-cnex 8793  ax-resscn 8794  ax-1cn 8795  ax-icn 8796  ax-addcl 8797  ax-addrcl 8798  ax-mulcl 8799  ax-mulrcl 8800  ax-mulcom 8801  ax-addass 8802  ax-mulass 8803  ax-distr 8804  ax-i2m1 8805  ax-1ne0 8806  ax-1rid 8807  ax-rnegex 8808  ax-rrecex 8809  ax-cnre 8810  ax-pre-lttri 8811  ax-pre-lttrn 8812  ax-pre-ltadd 8813  ax-pre-mulgt0 8814  ax-pre-sup 8815
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-nel 2449  df-ral 2548  df-rex 2549  df-reu 2550  df-rmo 2551  df-rab 2552  df-v 2790  df-sbc 2992  df-csb 3082  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-pss 3168  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-tp 3648  df-op 3649  df-uni 3828  df-int 3863  df-iun 3907  df-br 4024  df-opab 4078  df-mpt 4079  df-tr 4114  df-eprel 4305  df-id 4309  df-po 4314  df-so 4315  df-fr 4352  df-we 4354  df-ord 4395  df-on 4396  df-lim 4397  df-suc 4398  df-om 4657  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-rn 4700  df-res 4701  df-ima 4702  df-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-ov 5861  df-oprab 5862  df-mpt2 5863  df-1st 6122  df-2nd 6123  df-riota 6304  df-recs 6388  df-rdg 6423  df-1o 6479  df-oadd 6483  df-er 6660  df-map 6774  df-pm 6775  df-en 6864  df-dom 6865  df-sdom 6866  df-fin 6867  df-fi 7165  df-sup 7194  df-pnf 8869  df-mnf 8870  df-xr 8871  df-ltxr 8872  df-le 8873  df-sub 9039  df-neg 9040  df-div 9424  df-nn 9747  df-2 9804  df-3 9805  df-4 9806  df-5 9807  df-6 9808  df-7 9809  df-8 9810  df-9 9811  df-10 9812  df-n0 9966  df-z 10025  df-dec 10125  df-uz 10231  df-q 10317  df-rp 10355  df-xneg 10452  df-xadd 10453  df-xmul 10454  df-fz 10783  df-seq 11047  df-exp 11105  df-cj 11584  df-re 11585  df-im 11586  df-sqr 11720  df-abs 11721  df-struct 13150  df-ndx 13151  df-slot 13152  df-base 13153  df-plusg 13221  df-mulr 13222  df-starv 13223  df-tset 13227  df-ple 13228  df-ds 13230  df-rest 13327  df-topn 13328  df-topgen 13344  df-xmet 16373  df-met 16374  df-bl 16375  df-mopn 16376  df-cnfld 16378  df-top 16636  df-bases 16638  df-topon 16639  df-topsp 16640  df-cnp 16958  df-xms 17885  df-ms 17886  df-limc 19216
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