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Theorem cnnei 12872
Description: Continuity in terms of neighborhoods. (Contributed by Thierry Arnoux, 3-Jan-2018.)
Hypotheses
Ref Expression
cnnei.x  |-  X  = 
U. J
cnnei.y  |-  Y  = 
U. K
Assertion
Ref Expression
cnnei  |-  ( ( J  e.  Top  /\  K  e.  Top  /\  F : X --> Y )  -> 
( F  e.  ( J  Cn  K )  <->  A. p  e.  X  A. w  e.  (
( nei `  K
) `  { ( F `  p ) } ) E. v  e.  ( ( nei `  J
) `  { p } ) ( F
" v )  C_  w ) )
Distinct variable groups:    v, p, w, F    J, p, v, w    K, p, v, w    X, p, v, w    Y, p, v, w

Proof of Theorem cnnei
StepHypRef Expression
1 cnnei.x . . . . . 6  |-  X  = 
U. J
21toptopon 12656 . . . . 5  |-  ( J  e.  Top  <->  J  e.  (TopOn `  X ) )
3 cnnei.y . . . . . 6  |-  Y  = 
U. K
43toptopon 12656 . . . . 5  |-  ( K  e.  Top  <->  K  e.  (TopOn `  Y ) )
52, 4anbi12i 456 . . . 4  |-  ( ( J  e.  Top  /\  K  e.  Top )  <->  ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
) )
6 cncnp 12870 . . . . 5  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  ->  ( F  e.  ( J  Cn  K
)  <->  ( F : X
--> Y  /\  A. p  e.  X  F  e.  ( ( J  CnP  K ) `  p ) ) ) )
76baibd 913 . . . 4  |-  ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  /\  F : X
--> Y )  ->  ( F  e.  ( J  Cn  K )  <->  A. p  e.  X  F  e.  ( ( J  CnP  K ) `  p ) ) )
85, 7sylanb 282 . . 3  |-  ( ( ( J  e.  Top  /\  K  e.  Top )  /\  F : X --> Y )  ->  ( F  e.  ( J  Cn  K
)  <->  A. p  e.  X  F  e.  ( ( J  CnP  K ) `  p ) ) )
95anbi1i 454 . . . . 5  |-  ( ( ( J  e.  Top  /\  K  e.  Top )  /\  F : X --> Y )  <-> 
( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y ) )
10 iscnp4 12858 . . . . . . . 8  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )  /\  p  e.  X
)  ->  ( F  e.  ( ( J  CnP  K ) `  p )  <-> 
( F : X --> Y  /\  A. w  e.  ( ( nei `  K
) `  { ( F `  p ) } ) E. v  e.  ( ( nei `  J
) `  { p } ) ( F
" v )  C_  w ) ) )
11103expa 1193 . . . . . . 7  |-  ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  /\  p  e.  X )  ->  ( F  e.  ( ( J  CnP  K ) `  p )  <->  ( F : X --> Y  /\  A. w  e.  ( ( nei `  K ) `  { ( F `  p ) } ) E. v  e.  ( ( nei `  J
) `  { p } ) ( F
" v )  C_  w ) ) )
1211baibd 913 . . . . . 6  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  p  e.  X )  /\  F : X --> Y )  ->  ( F  e.  ( ( J  CnP  K ) `  p )  <->  A. w  e.  (
( nei `  K
) `  { ( F `  p ) } ) E. v  e.  ( ( nei `  J
) `  { p } ) ( F
" v )  C_  w ) )
1312an32s 558 . . . . 5  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  p  e.  X
)  ->  ( F  e.  ( ( J  CnP  K ) `  p )  <->  A. w  e.  (
( nei `  K
) `  { ( F `  p ) } ) E. v  e.  ( ( nei `  J
) `  { p } ) ( F
" v )  C_  w ) )
149, 13sylanb 282 . . . 4  |-  ( ( ( ( J  e. 
Top  /\  K  e.  Top )  /\  F : X
--> Y )  /\  p  e.  X )  ->  ( F  e.  ( ( J  CnP  K ) `  p )  <->  A. w  e.  ( ( nei `  K
) `  { ( F `  p ) } ) E. v  e.  ( ( nei `  J
) `  { p } ) ( F
" v )  C_  w ) )
1514ralbidva 2462 . . 3  |-  ( ( ( J  e.  Top  /\  K  e.  Top )  /\  F : X --> Y )  ->  ( A. p  e.  X  F  e.  ( ( J  CnP  K ) `  p )  <->  A. p  e.  X  A. w  e.  (
( nei `  K
) `  { ( F `  p ) } ) E. v  e.  ( ( nei `  J
) `  { p } ) ( F
" v )  C_  w ) )
168, 15bitrd 187 . 2  |-  ( ( ( J  e.  Top  /\  K  e.  Top )  /\  F : X --> Y )  ->  ( F  e.  ( J  Cn  K
)  <->  A. p  e.  X  A. w  e.  (
( nei `  K
) `  { ( F `  p ) } ) E. v  e.  ( ( nei `  J
) `  { p } ) ( F
" v )  C_  w ) )
17163impa 1184 1  |-  ( ( J  e.  Top  /\  K  e.  Top  /\  F : X --> Y )  -> 
( F  e.  ( J  Cn  K )  <->  A. p  e.  X  A. w  e.  (
( nei `  K
) `  { ( F `  p ) } ) E. v  e.  ( ( nei `  J
) `  { p } ) ( F
" v )  C_  w ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    <-> wb 104    /\ w3a 968    = wceq 1343    e. wcel 2136   A.wral 2444   E.wrex 2445    C_ wss 3116   {csn 3576   U.cuni 3789   "cima 4607   -->wf 5184   ` cfv 5188  (class class class)co 5842   Topctop 12635  TopOnctopon 12648   neicnei 12778    Cn ccn 12825    CnP ccnp 12826
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-coll 4097  ax-sep 4100  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514
This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-ral 2449  df-rex 2450  df-reu 2451  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-iun 3868  df-br 3983  df-opab 4044  df-mpt 4045  df-id 4271  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-f1 5193  df-fo 5194  df-f1o 5195  df-fv 5196  df-ov 5845  df-oprab 5846  df-mpo 5847  df-1st 6108  df-2nd 6109  df-map 6616  df-topgen 12577  df-top 12636  df-topon 12649  df-ntr 12736  df-nei 12779  df-cn 12828  df-cnp 12829
This theorem is referenced by: (None)
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