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Theorem cnco 12861
Description: The composition of two continuous functions is a continuous function. (Contributed by FL, 8-Dec-2006.) (Revised by Mario Carneiro, 21-Aug-2015.)
Assertion
Ref Expression
cnco  |-  ( ( F  e.  ( J  Cn  K )  /\  G  e.  ( K  Cn  L ) )  -> 
( G  o.  F
)  e.  ( J  Cn  L ) )

Proof of Theorem cnco
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 cntop1 12841 . . 3  |-  ( F  e.  ( J  Cn  K )  ->  J  e.  Top )
2 cntop2 12842 . . 3  |-  ( G  e.  ( K  Cn  L )  ->  L  e.  Top )
31, 2anim12i 336 . 2  |-  ( ( F  e.  ( J  Cn  K )  /\  G  e.  ( K  Cn  L ) )  -> 
( J  e.  Top  /\  L  e.  Top )
)
4 eqid 2165 . . . . 5  |-  U. K  =  U. K
5 eqid 2165 . . . . 5  |-  U. L  =  U. L
64, 5cnf 12844 . . . 4  |-  ( G  e.  ( K  Cn  L )  ->  G : U. K --> U. L
)
7 eqid 2165 . . . . 5  |-  U. J  =  U. J
87, 4cnf 12844 . . . 4  |-  ( F  e.  ( J  Cn  K )  ->  F : U. J --> U. K
)
9 fco 5353 . . . 4  |-  ( ( G : U. K --> U. L  /\  F : U. J --> U. K )  -> 
( G  o.  F
) : U. J --> U. L )
106, 8, 9syl2anr 288 . . 3  |-  ( ( F  e.  ( J  Cn  K )  /\  G  e.  ( K  Cn  L ) )  -> 
( G  o.  F
) : U. J --> U. L )
11 cnvco 4789 . . . . . . 7  |-  `' ( G  o.  F )  =  ( `' F  o.  `' G )
1211imaeq1i 4943 . . . . . 6  |-  ( `' ( G  o.  F
) " x )  =  ( ( `' F  o.  `' G
) " x )
13 imaco 5109 . . . . . 6  |-  ( ( `' F  o.  `' G ) " x
)  =  ( `' F " ( `' G " x ) )
1412, 13eqtri 2186 . . . . 5  |-  ( `' ( G  o.  F
) " x )  =  ( `' F " ( `' G "
x ) )
15 simpll 519 . . . . . 6  |-  ( ( ( F  e.  ( J  Cn  K )  /\  G  e.  ( K  Cn  L ) )  /\  x  e.  L )  ->  F  e.  ( J  Cn  K
) )
16 cnima 12860 . . . . . . 7  |-  ( ( G  e.  ( K  Cn  L )  /\  x  e.  L )  ->  ( `' G "
x )  e.  K
)
1716adantll 468 . . . . . 6  |-  ( ( ( F  e.  ( J  Cn  K )  /\  G  e.  ( K  Cn  L ) )  /\  x  e.  L )  ->  ( `' G " x )  e.  K )
18 cnima 12860 . . . . . 6  |-  ( ( F  e.  ( J  Cn  K )  /\  ( `' G " x )  e.  K )  -> 
( `' F "
( `' G "
x ) )  e.  J )
1915, 17, 18syl2anc 409 . . . . 5  |-  ( ( ( F  e.  ( J  Cn  K )  /\  G  e.  ( K  Cn  L ) )  /\  x  e.  L )  ->  ( `' F " ( `' G " x ) )  e.  J )
2014, 19eqeltrid 2253 . . . 4  |-  ( ( ( F  e.  ( J  Cn  K )  /\  G  e.  ( K  Cn  L ) )  /\  x  e.  L )  ->  ( `' ( G  o.  F ) " x
)  e.  J )
2120ralrimiva 2539 . . 3  |-  ( ( F  e.  ( J  Cn  K )  /\  G  e.  ( K  Cn  L ) )  ->  A. x  e.  L  ( `' ( G  o.  F ) " x
)  e.  J )
2210, 21jca 304 . 2  |-  ( ( F  e.  ( J  Cn  K )  /\  G  e.  ( K  Cn  L ) )  -> 
( ( G  o.  F ) : U. J
--> U. L  /\  A. x  e.  L  ( `' ( G  o.  F ) " x
)  e.  J ) )
237, 5iscn2 12840 . 2  |-  ( ( G  o.  F )  e.  ( J  Cn  L )  <->  ( ( J  e.  Top  /\  L  e.  Top )  /\  (
( G  o.  F
) : U. J --> U. L  /\  A. x  e.  L  ( `' ( G  o.  F
) " x )  e.  J ) ) )
243, 22, 23sylanbrc 414 1  |-  ( ( F  e.  ( J  Cn  K )  /\  G  e.  ( K  Cn  L ) )  -> 
( G  o.  F
)  e.  ( J  Cn  L ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    e. wcel 2136   A.wral 2444   U.cuni 3789   `'ccnv 4603   "cima 4607    o. ccom 4608   -->wf 5184  (class class class)co 5842   Topctop 12635    Cn ccn 12825
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
This theorem is referenced by:  txcn  12915  cnmpt11  12923  cnmpt21  12931  hmeoco  12956
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