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Theorem cnntr 17020
Description: Continuity in terms of interior. (Contributed by Jeff Hankins, 2-Oct-2009.) (Proof shortened by Mario Carneiro, 25-Aug-2015.)
Assertion
Ref Expression
cnntr  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  ->  ( F  e.  ( J  Cn  K
)  <->  ( F : X
--> Y  /\  A. x  e.  ~P  Y ( `' F " ( ( int `  K ) `
 x ) ) 
C_  ( ( int `  J ) `  ( `' F " x ) ) ) ) )
Distinct variable groups:    x, F    x, J    x, K    x, X    x, Y

Proof of Theorem cnntr
StepHypRef Expression
1 cnf2 16995 . . . 4  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )  /\  F  e.  ( J  Cn  K ) )  ->  F : X --> Y )
213expia 1153 . . 3  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  ->  ( F  e.  ( J  Cn  K
)  ->  F : X
--> Y ) )
3 elpwi 3646 . . . . . . 7  |-  ( x  e.  ~P Y  ->  x  C_  Y )
43adantl 452 . . . . . 6  |-  ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  /\  x  e.  ~P Y )  ->  x  C_  Y )
5 toponuni 16681 . . . . . . 7  |-  ( K  e.  (TopOn `  Y
)  ->  Y  =  U. K )
65ad2antlr 707 . . . . . 6  |-  ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  /\  x  e.  ~P Y )  ->  Y  =  U. K )
74, 6sseqtrd 3227 . . . . 5  |-  ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  /\  x  e.  ~P Y )  ->  x  C_ 
U. K )
8 eqid 2296 . . . . . . 7  |-  U. K  =  U. K
98cnntri 17016 . . . . . 6  |-  ( ( F  e.  ( J  Cn  K )  /\  x  C_  U. K )  ->  ( `' F " ( ( int `  K
) `  x )
)  C_  ( ( int `  J ) `  ( `' F " x ) ) )
109expcom 424 . . . . 5  |-  ( x 
C_  U. K  ->  ( F  e.  ( J  Cn  K )  ->  ( `' F " ( ( int `  K ) `
 x ) ) 
C_  ( ( int `  J ) `  ( `' F " x ) ) ) )
117, 10syl 15 . . . 4  |-  ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  /\  x  e.  ~P Y )  ->  ( F  e.  ( J  Cn  K )  ->  ( `' F " ( ( int `  K ) `
 x ) ) 
C_  ( ( int `  J ) `  ( `' F " x ) ) ) )
1211ralrimdva 2646 . . 3  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  ->  ( F  e.  ( J  Cn  K
)  ->  A. x  e.  ~P  Y ( `' F " ( ( int `  K ) `
 x ) ) 
C_  ( ( int `  J ) `  ( `' F " x ) ) ) )
132, 12jcad 519 . 2  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  ->  ( F  e.  ( J  Cn  K
)  ->  ( F : X --> Y  /\  A. x  e.  ~P  Y
( `' F "
( ( int `  K
) `  x )
)  C_  ( ( int `  J ) `  ( `' F " x ) ) ) ) )
14 toponss 16683 . . . . . . . . . 10  |-  ( ( K  e.  (TopOn `  Y )  /\  x  e.  K )  ->  x  C_  Y )
15 vex 2804 . . . . . . . . . . 11  |-  x  e. 
_V
1615elpw 3644 . . . . . . . . . 10  |-  ( x  e.  ~P Y  <->  x  C_  Y
)
1714, 16sylibr 203 . . . . . . . . 9  |-  ( ( K  e.  (TopOn `  Y )  /\  x  e.  K )  ->  x  e.  ~P Y )
1817ex 423 . . . . . . . 8  |-  ( K  e.  (TopOn `  Y
)  ->  ( x  e.  K  ->  x  e. 
~P Y ) )
1918ad2antlr 707 . . . . . . 7  |-  ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  /\  F : X
--> Y )  ->  (
x  e.  K  ->  x  e.  ~P Y
) )
2019imim1d 69 . . . . . 6  |-  ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  /\  F : X
--> Y )  ->  (
( x  e.  ~P Y  ->  ( `' F " ( ( int `  K
) `  x )
)  C_  ( ( int `  J ) `  ( `' F " x ) ) )  ->  (
x  e.  K  -> 
( `' F "
( ( int `  K
) `  x )
)  C_  ( ( int `  J ) `  ( `' F " x ) ) ) ) )
21 topontop 16680 . . . . . . . . . . 11  |-  ( J  e.  (TopOn `  X
)  ->  J  e.  Top )
2221ad3antrrr 710 . . . . . . . . . 10  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  J  e.  Top )
23 cnvimass 5049 . . . . . . . . . . 11  |-  ( `' F " x ) 
C_  dom  F
24 fdm 5409 . . . . . . . . . . . . 13  |-  ( F : X --> Y  ->  dom  F  =  X )
2524ad2antlr 707 . . . . . . . . . . . 12  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  dom  F  =  X )
26 toponuni 16681 . . . . . . . . . . . . 13  |-  ( J  e.  (TopOn `  X
)  ->  X  =  U. J )
2726ad3antrrr 710 . . . . . . . . . . . 12  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  X  =  U. J )
2825, 27eqtrd 2328 . . . . . . . . . . 11  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  dom  F  = 
U. J )
2923, 28syl5sseq 3239 . . . . . . . . . 10  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  ( `' F " x )  C_  U. J )
30 eqid 2296 . . . . . . . . . . 11  |-  U. J  =  U. J
3130ntrss2 16810 . . . . . . . . . 10  |-  ( ( J  e.  Top  /\  ( `' F " x ) 
C_  U. J )  -> 
( ( int `  J
) `  ( `' F " x ) ) 
C_  ( `' F " x ) )
3222, 29, 31syl2anc 642 . . . . . . . . 9  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  ( ( int `  J ) `  ( `' F " x ) )  C_  ( `' F " x ) )
33 eqss 3207 . . . . . . . . . 10  |-  ( ( ( int `  J
) `  ( `' F " x ) )  =  ( `' F " x )  <->  ( (
( int `  J
) `  ( `' F " x ) ) 
C_  ( `' F " x )  /\  ( `' F " x ) 
C_  ( ( int `  J ) `  ( `' F " x ) ) ) )
3433baib 871 . . . . . . . . 9  |-  ( ( ( int `  J
) `  ( `' F " x ) ) 
C_  ( `' F " x )  ->  (
( ( int `  J
) `  ( `' F " x ) )  =  ( `' F " x )  <->  ( `' F " x )  C_  ( ( int `  J
) `  ( `' F " x ) ) ) )
3532, 34syl 15 . . . . . . . 8  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  ( (
( int `  J
) `  ( `' F " x ) )  =  ( `' F " x )  <->  ( `' F " x )  C_  ( ( int `  J
) `  ( `' F " x ) ) ) )
3630isopn3 16819 . . . . . . . . 9  |-  ( ( J  e.  Top  /\  ( `' F " x ) 
C_  U. J )  -> 
( ( `' F " x )  e.  J  <->  ( ( int `  J
) `  ( `' F " x ) )  =  ( `' F " x ) ) )
3722, 29, 36syl2anc 642 . . . . . . . 8  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  ( ( `' F " x )  e.  J  <->  ( ( int `  J ) `  ( `' F " x ) )  =  ( `' F " x ) ) )
38 simpllr 735 . . . . . . . . . . . 12  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  K  e.  (TopOn `  Y ) )
39 topontop 16680 . . . . . . . . . . . 12  |-  ( K  e.  (TopOn `  Y
)  ->  K  e.  Top )
4038, 39syl 15 . . . . . . . . . . 11  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  K  e.  Top )
41 isopn3i 16835 . . . . . . . . . . 11  |-  ( ( K  e.  Top  /\  x  e.  K )  ->  ( ( int `  K
) `  x )  =  x )
4240, 41sylancom 648 . . . . . . . . . 10  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  ( ( int `  K ) `  x )  =  x )
4342imaeq2d 5028 . . . . . . . . 9  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  ( `' F " ( ( int `  K ) `  x
) )  =  ( `' F " x ) )
4443sseq1d 3218 . . . . . . . 8  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  ( ( `' F " ( ( int `  K ) `
 x ) ) 
C_  ( ( int `  J ) `  ( `' F " x ) )  <->  ( `' F " x )  C_  (
( int `  J
) `  ( `' F " x ) ) ) )
4535, 37, 443bitr4rd 277 . . . . . . 7  |-  ( ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y ) )  /\  F : X --> Y )  /\  x  e.  K
)  ->  ( ( `' F " ( ( int `  K ) `
 x ) ) 
C_  ( ( int `  J ) `  ( `' F " x ) )  <->  ( `' F " x )  e.  J
) )
4645pm5.74da 668 . . . . . 6  |-  ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  /\  F : X
--> Y )  ->  (
( x  e.  K  ->  ( `' F "
( ( int `  K
) `  x )
)  C_  ( ( int `  J ) `  ( `' F " x ) ) )  <->  ( x  e.  K  ->  ( `' F " x )  e.  J ) ) )
4720, 46sylibd 205 . . . . 5  |-  ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  /\  F : X
--> Y )  ->  (
( x  e.  ~P Y  ->  ( `' F " ( ( int `  K
) `  x )
)  C_  ( ( int `  J ) `  ( `' F " x ) ) )  ->  (
x  e.  K  -> 
( `' F "
x )  e.  J
) ) )
4847ralimdv2 2636 . . . 4  |-  ( ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  /\  F : X
--> Y )  ->  ( A. x  e.  ~P  Y ( `' F " ( ( int `  K
) `  x )
)  C_  ( ( int `  J ) `  ( `' F " x ) )  ->  A. x  e.  K  ( `' F " x )  e.  J ) )
4948imdistanda 674 . . 3  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  ->  ( ( F : X --> Y  /\  A. x  e.  ~P  Y
( `' F "
( ( int `  K
) `  x )
)  C_  ( ( int `  J ) `  ( `' F " x ) ) )  ->  ( F : X --> Y  /\  A. x  e.  K  ( `' F " x )  e.  J ) ) )
50 iscn 16981 . . 3  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  ->  ( F  e.  ( J  Cn  K
)  <->  ( F : X
--> Y  /\  A. x  e.  K  ( `' F " x )  e.  J ) ) )
5149, 50sylibrd 225 . 2  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  ->  ( ( F : X --> Y  /\  A. x  e.  ~P  Y
( `' F "
( ( int `  K
) `  x )
)  C_  ( ( int `  J ) `  ( `' F " x ) ) )  ->  F  e.  ( J  Cn  K
) ) )
5213, 51impbid 183 1  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  ->  ( F  e.  ( J  Cn  K
)  <->  ( F : X
--> Y  /\  A. x  e.  ~P  Y ( `' F " ( ( int `  K ) `
 x ) ) 
C_  ( ( int `  J ) `  ( `' F " x ) ) ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    /\ wa 358    = wceq 1632    e. wcel 1696   A.wral 2556    C_ wss 3165   ~Pcpw 3638   U.cuni 3843   `'ccnv 4704   dom cdm 4705   "cima 4708   -->wf 5267   ` cfv 5271  (class class class)co 5874   Topctop 16647  TopOnctopon 16648   intcnt 16770    Cn ccn 16970
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-13 1698  ax-14 1700  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277  ax-rep 4147  ax-sep 4157  ax-nul 4165  ax-pow 4204  ax-pr 4230  ax-un 4528
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-mo 2161  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ne 2461  df-ral 2561  df-rex 2562  df-reu 2563  df-rab 2565  df-v 2803  df-sbc 3005  df-csb 3095  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-nul 3469  df-if 3579  df-pw 3640  df-sn 3659  df-pr 3660  df-op 3662  df-uni 3844  df-iun 3923  df-br 4040  df-opab 4094  df-mpt 4095  df-id 4325  df-xp 4711  df-rel 4712  df-cnv 4713  df-co 4714  df-dm 4715  df-rn 4716  df-res 4717  df-ima 4718  df-iota 5235  df-fun 5273  df-fn 5274  df-f 5275  df-f1 5276  df-fo 5277  df-f1o 5278  df-fv 5279  df-ov 5877  df-oprab 5878  df-mpt2 5879  df-map 6790  df-top 16652  df-topon 16655  df-ntr 16773  df-cn 16973
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