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Theorem iscn2 21042
Description: The predicate " F is a continuous function from topology  J to topology  K." Definition of continuous function in [Munkres] p. 102. (Contributed by Mario Carneiro, 21-Aug-2015.)
Hypotheses
Ref Expression
iscn.1  |-  X  = 
U. J
iscn.2  |-  Y  = 
U. K
Assertion
Ref Expression
iscn2  |-  ( F  e.  ( J  Cn  K )  <->  ( ( J  e.  Top  /\  K  e.  Top )  /\  ( F : X --> Y  /\  A. y  e.  K  ( `' F " y )  e.  J ) ) )
Distinct variable groups:    y, J    y, K    y, X    y, F    y, Y

Proof of Theorem iscn2
Dummy variables  f 
j  k are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-cn 21031 . . 3  |-  Cn  =  ( j  e.  Top ,  k  e.  Top  |->  { f  e.  ( U. k  ^m  U. j )  |  A. y  e.  k  ( `' f
" y )  e.  j } )
21elmpt2cl 6876 . 2  |-  ( F  e.  ( J  Cn  K )  ->  ( J  e.  Top  /\  K  e.  Top ) )
3 iscn.1 . . . 4  |-  X  = 
U. J
43toptopon 20722 . . 3  |-  ( J  e.  Top  <->  J  e.  (TopOn `  X ) )
5 iscn.2 . . . 4  |-  Y  = 
U. K
65toptopon 20722 . . 3  |-  ( K  e.  Top  <->  K  e.  (TopOn `  Y ) )
7 iscn 21039 . . 3  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )
)  ->  ( F  e.  ( J  Cn  K
)  <->  ( F : X
--> Y  /\  A. y  e.  K  ( `' F " y )  e.  J ) ) )
84, 6, 7syl2anb 496 . 2  |-  ( ( J  e.  Top  /\  K  e.  Top )  ->  ( F  e.  ( J  Cn  K )  <-> 
( F : X --> Y  /\  A. y  e.  K  ( `' F " y )  e.  J
) ) )
92, 8biadan2 674 1  |-  ( F  e.  ( J  Cn  K )  <->  ( ( J  e.  Top  /\  K  e.  Top )  /\  ( F : X --> Y  /\  A. y  e.  K  ( `' F " y )  e.  J ) ) )
Colors of variables: wff setvar class
Syntax hints:    <-> wb 196    /\ wa 384    = wceq 1483    e. wcel 1990   A.wral 2912   {crab 2916   U.cuni 4436   `'ccnv 5113   "cima 5117   -->wf 5884   ` cfv 5888  (class class class)co 6650    ^m cmap 7857   Topctop 20698  TopOnctopon 20715    Cn ccn 21028
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-map 7859  df-top 20699  df-topon 20716  df-cn 21031
This theorem is referenced by:  cntop1  21044  cntop2  21045  cnf  21050  cnima  21069  cnco  21070  ptpjcn  21414
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