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Theorem elcncf 15564
Description: Membership in the set of continuous complex functions from 
A to  B. (Contributed by Paul Chapman, 11-Oct-2007.) (Revised by Mario Carneiro, 9-Nov-2013.)
Assertion
Ref Expression
elcncf  |-  ( ( A  C_  CC  /\  B  C_  CC )  ->  ( F  e.  ( A -cn-> B )  <->  ( F : A --> B  /\  A. x  e.  A  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  A  ( ( abs `  ( x  -  w
) )  <  z  ->  ( abs `  (
( F `  x
)  -  ( F `
 w ) ) )  <  y ) ) ) )
Distinct variable groups:    x, w, y, z, A    w, F, x, y, z    w, B, x, y, z

Proof of Theorem elcncf
Dummy variable  f is distinct from all other variables.
StepHypRef Expression
1 cncfval 15563 . . . 4  |-  ( ( A  C_  CC  /\  B  C_  CC )  ->  ( A -cn-> B )  =  { f  e.  ( B  ^m  A )  |  A. x  e.  A  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  A  ( ( abs `  (
x  -  w ) )  <  z  -> 
( abs `  (
( f `  x
)  -  ( f `
 w ) ) )  <  y ) } )
21eleq2d 2304 . . 3  |-  ( ( A  C_  CC  /\  B  C_  CC )  ->  ( F  e.  ( A -cn-> B )  <->  F  e.  { f  e.  ( B  ^m  A )  | 
A. x  e.  A  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  A  ( ( abs `  ( x  -  w
) )  <  z  ->  ( abs `  (
( f `  x
)  -  ( f `
 w ) ) )  <  y ) } ) )
3 fveq1 5674 . . . . . . . . . 10  |-  ( f  =  F  ->  (
f `  x )  =  ( F `  x ) )
4 fveq1 5674 . . . . . . . . . 10  |-  ( f  =  F  ->  (
f `  w )  =  ( F `  w ) )
53, 4oveq12d 6076 . . . . . . . . 9  |-  ( f  =  F  ->  (
( f `  x
)  -  ( f `
 w ) )  =  ( ( F `
 x )  -  ( F `  w ) ) )
65fveq2d 5679 . . . . . . . 8  |-  ( f  =  F  ->  ( abs `  ( ( f `
 x )  -  ( f `  w
) ) )  =  ( abs `  (
( F `  x
)  -  ( F `
 w ) ) ) )
76breq1d 4124 . . . . . . 7  |-  ( f  =  F  ->  (
( abs `  (
( f `  x
)  -  ( f `
 w ) ) )  <  y  <->  ( abs `  ( ( F `  x )  -  ( F `  w )
) )  <  y
) )
87imbi2d 230 . . . . . 6  |-  ( f  =  F  ->  (
( ( abs `  (
x  -  w ) )  <  z  -> 
( abs `  (
( f `  x
)  -  ( f `
 w ) ) )  <  y )  <-> 
( ( abs `  (
x  -  w ) )  <  z  -> 
( abs `  (
( F `  x
)  -  ( F `
 w ) ) )  <  y ) ) )
98rexralbidv 2570 . . . . 5  |-  ( f  =  F  ->  ( E. z  e.  RR+  A. w  e.  A  ( ( abs `  ( x  -  w ) )  < 
z  ->  ( abs `  ( ( f `  x )  -  (
f `  w )
) )  <  y
)  <->  E. z  e.  RR+  A. w  e.  A  ( ( abs `  (
x  -  w ) )  <  z  -> 
( abs `  (
( F `  x
)  -  ( F `
 w ) ) )  <  y ) ) )
1092ralbidv 2568 . . . 4  |-  ( f  =  F  ->  ( A. x  e.  A  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  A  ( ( abs `  ( x  -  w
) )  <  z  ->  ( abs `  (
( f `  x
)  -  ( f `
 w ) ) )  <  y )  <->  A. x  e.  A  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  A  ( ( abs `  ( x  -  w
) )  <  z  ->  ( abs `  (
( F `  x
)  -  ( F `
 w ) ) )  <  y ) ) )
1110elrab 2976 . . 3  |-  ( F  e.  { f  e.  ( B  ^m  A
)  |  A. x  e.  A  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  A  ( ( abs `  (
x  -  w ) )  <  z  -> 
( abs `  (
( f `  x
)  -  ( f `
 w ) ) )  <  y ) }  <->  ( F  e.  ( B  ^m  A
)  /\  A. x  e.  A  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  A  ( ( abs `  (
x  -  w ) )  <  z  -> 
( abs `  (
( F `  x
)  -  ( F `
 w ) ) )  <  y ) ) )
122, 11bitrdi 196 . 2  |-  ( ( A  C_  CC  /\  B  C_  CC )  ->  ( F  e.  ( A -cn-> B )  <->  ( F  e.  ( B  ^m  A
)  /\  A. x  e.  A  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  A  ( ( abs `  (
x  -  w ) )  <  z  -> 
( abs `  (
( F `  x
)  -  ( F `
 w ) ) )  <  y ) ) ) )
13 cnex 8267 . . . . 5  |-  CC  e.  _V
1413ssex 4252 . . . 4  |-  ( B 
C_  CC  ->  B  e. 
_V )
1513ssex 4252 . . . 4  |-  ( A 
C_  CC  ->  A  e. 
_V )
16 elmapg 6908 . . . 4  |-  ( ( B  e.  _V  /\  A  e.  _V )  ->  ( F  e.  ( B  ^m  A )  <-> 
F : A --> B ) )
1714, 15, 16syl2anr 290 . . 3  |-  ( ( A  C_  CC  /\  B  C_  CC )  ->  ( F  e.  ( B  ^m  A )  <->  F : A
--> B ) )
1817anbi1d 465 . 2  |-  ( ( A  C_  CC  /\  B  C_  CC )  ->  (
( F  e.  ( B  ^m  A )  /\  A. x  e.  A  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  A  ( ( abs `  (
x  -  w ) )  <  z  -> 
( abs `  (
( F `  x
)  -  ( F `
 w ) ) )  <  y ) )  <->  ( F : A
--> B  /\  A. x  e.  A  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  A  ( ( abs `  (
x  -  w ) )  <  z  -> 
( abs `  (
( F `  x
)  -  ( F `
 w ) ) )  <  y ) ) ) )
1912, 18bitrd 188 1  |-  ( ( A  C_  CC  /\  B  C_  CC )  ->  ( F  e.  ( A -cn-> B )  <->  ( F : A --> B  /\  A. x  e.  A  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  A  ( ( abs `  ( x  -  w
) )  <  z  ->  ( abs `  (
( F `  x
)  -  ( F `
 w ) ) )  <  y ) ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    <-> wb 105    = wceq 1398    e. wcel 2205   A.wral 2522   E.wrex 2523   {crab 2526   _Vcvv 2815    C_ wss 3214   class class class wbr 4114   -->wf 5353   ` cfv 5357  (class class class)co 6058    ^m cmap 6895   CCcc 8141    < clt 8324    - cmin 8460   RR+crp 10004   abscabs 11707   -cn->ccncf 15561
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-cnex 8234
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-ral 2527  df-rex 2528  df-rab 2531  df-v 2817  df-sbc 3046  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-br 4115  df-opab 4177  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-fv 5365  df-ov 6061  df-oprab 6062  df-mpo 6063  df-map 6897  df-cncf 15562
This theorem is referenced by:  elcncf2  15565  cncff  15568  elcncf1di  15570  rescncf  15572  cncfmet  15583
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