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Theorem cncnpi 12868
Description: A continuous function is continuous at all points. One direction of Theorem 7.2(g) of [Munkres] p. 107. (Contributed by Raph Levien, 20-Nov-2006.) (Proof shortened by Mario Carneiro, 21-Aug-2015.)
Hypothesis
Ref Expression
cnsscnp.1  |-  X  = 
U. J
Assertion
Ref Expression
cncnpi  |-  ( ( F  e.  ( J  Cn  K )  /\  A  e.  X )  ->  F  e.  ( ( J  CnP  K ) `
 A ) )

Proof of Theorem cncnpi
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 cnsscnp.1 . . . 4  |-  X  = 
U. J
2 eqid 2165 . . . 4  |-  U. K  =  U. K
31, 2cnf 12844 . . 3  |-  ( F  e.  ( J  Cn  K )  ->  F : X --> U. K )
43adantr 274 . 2  |-  ( ( F  e.  ( J  Cn  K )  /\  A  e.  X )  ->  F : X --> U. K
)
5 cnima 12860 . . . . . 6  |-  ( ( F  e.  ( J  Cn  K )  /\  y  e.  K )  ->  ( `' F "
y )  e.  J
)
65ad2ant2r 501 . . . . 5  |-  ( ( ( F  e.  ( J  Cn  K )  /\  A  e.  X
)  /\  ( y  e.  K  /\  ( F `  A )  e.  y ) )  -> 
( `' F "
y )  e.  J
)
7 simpr 109 . . . . . . 7  |-  ( ( F  e.  ( J  Cn  K )  /\  A  e.  X )  ->  A  e.  X )
87adantr 274 . . . . . 6  |-  ( ( ( F  e.  ( J  Cn  K )  /\  A  e.  X
)  /\  ( y  e.  K  /\  ( F `  A )  e.  y ) )  ->  A  e.  X )
9 simprr 522 . . . . . 6  |-  ( ( ( F  e.  ( J  Cn  K )  /\  A  e.  X
)  /\  ( y  e.  K  /\  ( F `  A )  e.  y ) )  -> 
( F `  A
)  e.  y )
103ad2antrr 480 . . . . . . 7  |-  ( ( ( F  e.  ( J  Cn  K )  /\  A  e.  X
)  /\  ( y  e.  K  /\  ( F `  A )  e.  y ) )  ->  F : X --> U. K
)
11 ffn 5337 . . . . . . 7  |-  ( F : X --> U. K  ->  F  Fn  X )
12 elpreima 5604 . . . . . . 7  |-  ( F  Fn  X  ->  ( A  e.  ( `' F " y )  <->  ( A  e.  X  /\  ( F `  A )  e.  y ) ) )
1310, 11, 123syl 17 . . . . . 6  |-  ( ( ( F  e.  ( J  Cn  K )  /\  A  e.  X
)  /\  ( y  e.  K  /\  ( F `  A )  e.  y ) )  -> 
( A  e.  ( `' F " y )  <-> 
( A  e.  X  /\  ( F `  A
)  e.  y ) ) )
148, 9, 13mpbir2and 934 . . . . 5  |-  ( ( ( F  e.  ( J  Cn  K )  /\  A  e.  X
)  /\  ( y  e.  K  /\  ( F `  A )  e.  y ) )  ->  A  e.  ( `' F " y ) )
15 eqimss 3196 . . . . . . . 8  |-  ( x  =  ( `' F " y )  ->  x  C_  ( `' F "
y ) )
1615biantrud 302 . . . . . . 7  |-  ( x  =  ( `' F " y )  ->  ( A  e.  x  <->  ( A  e.  x  /\  x  C_  ( `' F "
y ) ) ) )
17 eleq2 2230 . . . . . . 7  |-  ( x  =  ( `' F " y )  ->  ( A  e.  x  <->  A  e.  ( `' F " y ) ) )
1816, 17bitr3d 189 . . . . . 6  |-  ( x  =  ( `' F " y )  ->  (
( A  e.  x  /\  x  C_  ( `' F " y ) )  <->  A  e.  ( `' F " y ) ) )
1918rspcev 2830 . . . . 5  |-  ( ( ( `' F "
y )  e.  J  /\  A  e.  ( `' F " y ) )  ->  E. x  e.  J  ( A  e.  x  /\  x  C_  ( `' F "
y ) ) )
206, 14, 19syl2anc 409 . . . 4  |-  ( ( ( F  e.  ( J  Cn  K )  /\  A  e.  X
)  /\  ( y  e.  K  /\  ( F `  A )  e.  y ) )  ->  E. x  e.  J  ( A  e.  x  /\  x  C_  ( `' F " y ) ) )
2120expr 373 . . 3  |-  ( ( ( F  e.  ( J  Cn  K )  /\  A  e.  X
)  /\  y  e.  K )  ->  (
( F `  A
)  e.  y  ->  E. x  e.  J  ( A  e.  x  /\  x  C_  ( `' F " y ) ) ) )
2221ralrimiva 2539 . 2  |-  ( ( F  e.  ( J  Cn  K )  /\  A  e.  X )  ->  A. y  e.  K  ( ( F `  A )  e.  y  ->  E. x  e.  J  ( A  e.  x  /\  x  C_  ( `' F " y ) ) ) )
23 cntop1 12841 . . . . 5  |-  ( F  e.  ( J  Cn  K )  ->  J  e.  Top )
2423adantr 274 . . . 4  |-  ( ( F  e.  ( J  Cn  K )  /\  A  e.  X )  ->  J  e.  Top )
251toptopon 12656 . . . 4  |-  ( J  e.  Top  <->  J  e.  (TopOn `  X ) )
2624, 25sylib 121 . . 3  |-  ( ( F  e.  ( J  Cn  K )  /\  A  e.  X )  ->  J  e.  (TopOn `  X ) )
27 cntop2 12842 . . . . 5  |-  ( F  e.  ( J  Cn  K )  ->  K  e.  Top )
2827adantr 274 . . . 4  |-  ( ( F  e.  ( J  Cn  K )  /\  A  e.  X )  ->  K  e.  Top )
292toptopon 12656 . . . 4  |-  ( K  e.  Top  <->  K  e.  (TopOn `  U. K ) )
3028, 29sylib 121 . . 3  |-  ( ( F  e.  ( J  Cn  K )  /\  A  e.  X )  ->  K  e.  (TopOn `  U. K ) )
31 iscnp3 12843 . . 3  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  U. K )  /\  A  e.  X
)  ->  ( F  e.  ( ( J  CnP  K ) `  A )  <-> 
( F : X --> U. K  /\  A. y  e.  K  ( ( F `  A )  e.  y  ->  E. x  e.  J  ( A  e.  x  /\  x  C_  ( `' F "
y ) ) ) ) ) )
3226, 30, 7, 31syl3anc 1228 . 2  |-  ( ( F  e.  ( J  Cn  K )  /\  A  e.  X )  ->  ( F  e.  ( ( J  CnP  K
) `  A )  <->  ( F : X --> U. K  /\  A. y  e.  K  ( ( F `  A )  e.  y  ->  E. x  e.  J  ( A  e.  x  /\  x  C_  ( `' F " y ) ) ) ) ) )
334, 22, 32mpbir2and 934 1  |-  ( ( F  e.  ( J  Cn  K )  /\  A  e.  X )  ->  F  e.  ( ( J  CnP  K ) `
 A ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    <-> wb 104    = wceq 1343    e. wcel 2136   A.wral 2444   E.wrex 2445    C_ wss 3116   U.cuni 3789   `'ccnv 4603   "cima 4607    Fn wfn 5183   -->wf 5184   ` cfv 5188  (class class class)co 5842   Topctop 12635  TopOnctopon 12648    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-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-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-fv 5196  df-ov 5845  df-oprab 5846  df-mpo 5847  df-1st 6108  df-2nd 6109  df-map 6616  df-top 12636  df-topon 12649  df-cn 12828  df-cnp 12829
This theorem is referenced by:  cnsscnp  12869  cncnp  12870  lmcn  12891  dvcnp2cntop  13303  dvaddxxbr  13305  dvmulxxbr  13306  dvcoapbr  13311  dvcjbr  13312
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