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Theorem txopn 17626
Description: The product of two open sets is open in the product topology. (Contributed by Jeff Madsen, 2-Sep-2009.)
Assertion
Ref Expression
txopn  |-  ( ( ( R  e.  V  /\  S  e.  W
)  /\  ( A  e.  R  /\  B  e.  S ) )  -> 
( A  X.  B
)  e.  ( R 
tX  S ) )

Proof of Theorem txopn
Dummy variables  u  v are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eqid 2435 . . . . . 6  |-  ran  (
u  e.  R , 
v  e.  S  |->  ( u  X.  v ) )  =  ran  (
u  e.  R , 
v  e.  S  |->  ( u  X.  v ) )
21txbasex 17590 . . . . 5  |-  ( ( R  e.  V  /\  S  e.  W )  ->  ran  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v ) )  e. 
_V )
3 bastg 17023 . . . . 5  |-  ( ran  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v
) )  e.  _V  ->  ran  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v ) )  C_  ( topGen `  ran  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v ) ) ) )
42, 3syl 16 . . . 4  |-  ( ( R  e.  V  /\  S  e.  W )  ->  ran  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v ) )  C_  ( topGen `  ran  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v ) ) ) )
54adantr 452 . . 3  |-  ( ( ( R  e.  V  /\  S  e.  W
)  /\  ( A  e.  R  /\  B  e.  S ) )  ->  ran  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v
) )  C_  ( topGen `
 ran  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v ) ) ) )
6 eqid 2435 . . . . . 6  |-  ( A  X.  B )  =  ( A  X.  B
)
7 xpeq1 4884 . . . . . . . 8  |-  ( u  =  A  ->  (
u  X.  v )  =  ( A  X.  v ) )
87eqeq2d 2446 . . . . . . 7  |-  ( u  =  A  ->  (
( A  X.  B
)  =  ( u  X.  v )  <->  ( A  X.  B )  =  ( A  X.  v ) ) )
9 xpeq2 4885 . . . . . . . 8  |-  ( v  =  B  ->  ( A  X.  v )  =  ( A  X.  B
) )
109eqeq2d 2446 . . . . . . 7  |-  ( v  =  B  ->  (
( A  X.  B
)  =  ( A  X.  v )  <->  ( A  X.  B )  =  ( A  X.  B ) ) )
118, 10rspc2ev 3052 . . . . . 6  |-  ( ( A  e.  R  /\  B  e.  S  /\  ( A  X.  B
)  =  ( A  X.  B ) )  ->  E. u  e.  R  E. v  e.  S  ( A  X.  B
)  =  ( u  X.  v ) )
126, 11mp3an3 1268 . . . . 5  |-  ( ( A  e.  R  /\  B  e.  S )  ->  E. u  e.  R  E. v  e.  S  ( A  X.  B
)  =  ( u  X.  v ) )
13 xpexg 4981 . . . . . 6  |-  ( ( A  e.  R  /\  B  e.  S )  ->  ( A  X.  B
)  e.  _V )
14 eqid 2435 . . . . . . 7  |-  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v ) )  =  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v ) )
1514elrnmpt2g 6174 . . . . . 6  |-  ( ( A  X.  B )  e.  _V  ->  (
( A  X.  B
)  e.  ran  (
u  e.  R , 
v  e.  S  |->  ( u  X.  v ) )  <->  E. u  e.  R  E. v  e.  S  ( A  X.  B
)  =  ( u  X.  v ) ) )
1613, 15syl 16 . . . . 5  |-  ( ( A  e.  R  /\  B  e.  S )  ->  ( ( A  X.  B )  e.  ran  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v
) )  <->  E. u  e.  R  E. v  e.  S  ( A  X.  B )  =  ( u  X.  v ) ) )
1712, 16mpbird 224 . . . 4  |-  ( ( A  e.  R  /\  B  e.  S )  ->  ( A  X.  B
)  e.  ran  (
u  e.  R , 
v  e.  S  |->  ( u  X.  v ) ) )
1817adantl 453 . . 3  |-  ( ( ( R  e.  V  /\  S  e.  W
)  /\  ( A  e.  R  /\  B  e.  S ) )  -> 
( A  X.  B
)  e.  ran  (
u  e.  R , 
v  e.  S  |->  ( u  X.  v ) ) )
195, 18sseldd 3341 . 2  |-  ( ( ( R  e.  V  /\  S  e.  W
)  /\  ( A  e.  R  /\  B  e.  S ) )  -> 
( A  X.  B
)  e.  ( topGen ` 
ran  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v ) ) ) )
201txval 17588 . . 3  |-  ( ( R  e.  V  /\  S  e.  W )  ->  ( R  tX  S
)  =  ( topGen ` 
ran  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v ) ) ) )
2120adantr 452 . 2  |-  ( ( ( R  e.  V  /\  S  e.  W
)  /\  ( A  e.  R  /\  B  e.  S ) )  -> 
( R  tX  S
)  =  ( topGen ` 
ran  ( u  e.  R ,  v  e.  S  |->  ( u  X.  v ) ) ) )
2219, 21eleqtrrd 2512 1  |-  ( ( ( R  e.  V  /\  S  e.  W
)  /\  ( A  e.  R  /\  B  e.  S ) )  -> 
( A  X.  B
)  e.  ( R 
tX  S ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 177    /\ wa 359    = wceq 1652    e. wcel 1725   E.wrex 2698   _Vcvv 2948    C_ wss 3312    X. cxp 4868   ran crn 4871   ` cfv 5446  (class class class)co 6073    e. cmpt2 6075   topGenctg 13657    tX ctx 17584
This theorem is referenced by:  txcld  17627  txbasval  17630  neitx  17631  tx1cn  17633  tx2cn  17634  txlly  17660  txnlly  17661  txhaus  17671  txlm  17672  tx1stc  17674  txkgen  17676  xkococnlem  17683  cxpcn3  20624  cvmlift2lem11  24992  cvmlift2lem12  24993
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-13 1727  ax-14 1729  ax-6 1744  ax-7 1749  ax-11 1761  ax-12 1950  ax-ext 2416  ax-sep 4322  ax-nul 4330  ax-pow 4369  ax-pr 4395  ax-un 4693
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3an 938  df-tru 1328  df-ex 1551  df-nf 1554  df-sb 1659  df-eu 2284  df-mo 2285  df-clab 2422  df-cleq 2428  df-clel 2431  df-nfc 2560  df-ne 2600  df-ral 2702  df-rex 2703  df-rab 2706  df-v 2950  df-sbc 3154  df-csb 3244  df-dif 3315  df-un 3317  df-in 3319  df-ss 3326  df-nul 3621  df-if 3732  df-pw 3793  df-sn 3812  df-pr 3813  df-op 3815  df-uni 4008  df-iun 4087  df-br 4205  df-opab 4259  df-mpt 4260  df-id 4490  df-xp 4876  df-rel 4877  df-cnv 4878  df-co 4879  df-dm 4880  df-rn 4881  df-res 4882  df-ima 4883  df-iota 5410  df-fun 5448  df-fn 5449  df-f 5450  df-fv 5454  df-ov 6076  df-oprab 6077  df-mpt2 6078  df-1st 6341  df-2nd 6342  df-topgen 13659  df-tx 17586
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