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Theorem ptpjpre2 17604
Description: The basis for a product topology is a basis. (Contributed by Mario Carneiro, 3-Feb-2015.)
Hypotheses
Ref Expression
ptbas.1  |-  B  =  { x  |  E. g ( ( g  Fn  A  /\  A. y  e.  A  (
g `  y )  e.  ( F `  y
)  /\  E. z  e.  Fin  A. y  e.  ( A  \  z
) ( g `  y )  =  U. ( F `  y ) )  /\  x  = 
X_ y  e.  A  ( g `  y
) ) }
ptbasfi.2  |-  X  = 
X_ n  e.  A  U. ( F `  n
)
Assertion
Ref Expression
ptpjpre2  |-  ( ( ( A  e.  V  /\  F : A --> Top )  /\  ( I  e.  A  /\  U  e.  ( F `  I )
) )  ->  ( `' ( w  e.  X  |->  ( w `  I ) ) " U )  e.  B
)
Distinct variable groups:    B, n    w, g, x, y, n, I    z, g, A, n, w, x, y    U, g, n, w, x, y    g, F, n, w, x, y, z   
g, X, w, x, z    g, V, n, w, x, y, z
Allowed substitution hints:    B( x, y, z, w, g)    U( z)    I( z)    X( y, n)

Proof of Theorem ptpjpre2
StepHypRef Expression
1 ptbasfi.2 . . 3  |-  X  = 
X_ n  e.  A  U. ( F `  n
)
21ptpjpre1 17595 . 2  |-  ( ( ( A  e.  V  /\  F : A --> Top )  /\  ( I  e.  A  /\  U  e.  ( F `  I )
) )  ->  ( `' ( w  e.  X  |->  ( w `  I ) ) " U )  =  X_ n  e.  A  if ( n  =  I ,  U ,  U. ( F `  n )
) )
3 ptbas.1 . . 3  |-  B  =  { x  |  E. g ( ( g  Fn  A  /\  A. y  e.  A  (
g `  y )  e.  ( F `  y
)  /\  E. z  e.  Fin  A. y  e.  ( A  \  z
) ( g `  y )  =  U. ( F `  y ) )  /\  x  = 
X_ y  e.  A  ( g `  y
) ) }
4 simpll 731 . . 3  |-  ( ( ( A  e.  V  /\  F : A --> Top )  /\  ( I  e.  A  /\  U  e.  ( F `  I )
) )  ->  A  e.  V )
5 snfi 7179 . . . 4  |-  { I }  e.  Fin
65a1i 11 . . 3  |-  ( ( ( A  e.  V  /\  F : A --> Top )  /\  ( I  e.  A  /\  U  e.  ( F `  I )
) )  ->  { I }  e.  Fin )
7 simprr 734 . . . . . 6  |-  ( ( ( A  e.  V  /\  F : A --> Top )  /\  ( I  e.  A  /\  U  e.  ( F `  I )
) )  ->  U  e.  ( F `  I
) )
87ad2antrr 707 . . . . 5  |-  ( ( ( ( ( A  e.  V  /\  F : A --> Top )  /\  (
I  e.  A  /\  U  e.  ( F `  I ) ) )  /\  n  e.  A
)  /\  n  =  I )  ->  U  e.  ( F `  I
) )
9 simpr 448 . . . . . 6  |-  ( ( ( ( ( A  e.  V  /\  F : A --> Top )  /\  (
I  e.  A  /\  U  e.  ( F `  I ) ) )  /\  n  e.  A
)  /\  n  =  I )  ->  n  =  I )
109fveq2d 5724 . . . . 5  |-  ( ( ( ( ( A  e.  V  /\  F : A --> Top )  /\  (
I  e.  A  /\  U  e.  ( F `  I ) ) )  /\  n  e.  A
)  /\  n  =  I )  ->  ( F `  n )  =  ( F `  I ) )
118, 10eleqtrrd 2512 . . . 4  |-  ( ( ( ( ( A  e.  V  /\  F : A --> Top )  /\  (
I  e.  A  /\  U  e.  ( F `  I ) ) )  /\  n  e.  A
)  /\  n  =  I )  ->  U  e.  ( F `  n
) )
12 simplr 732 . . . . . . 7  |-  ( ( ( A  e.  V  /\  F : A --> Top )  /\  ( I  e.  A  /\  U  e.  ( F `  I )
) )  ->  F : A --> Top )
1312ffvelrnda 5862 . . . . . 6  |-  ( ( ( ( A  e.  V  /\  F : A
--> Top )  /\  (
I  e.  A  /\  U  e.  ( F `  I ) ) )  /\  n  e.  A
)  ->  ( F `  n )  e.  Top )
14 eqid 2435 . . . . . . 7  |-  U. ( F `  n )  =  U. ( F `  n )
1514topopn 16971 . . . . . 6  |-  ( ( F `  n )  e.  Top  ->  U. ( F `  n )  e.  ( F `  n
) )
1613, 15syl 16 . . . . 5  |-  ( ( ( ( A  e.  V  /\  F : A
--> Top )  /\  (
I  e.  A  /\  U  e.  ( F `  I ) ) )  /\  n  e.  A
)  ->  U. ( F `  n )  e.  ( F `  n
) )
1716adantr 452 . . . 4  |-  ( ( ( ( ( A  e.  V  /\  F : A --> Top )  /\  (
I  e.  A  /\  U  e.  ( F `  I ) ) )  /\  n  e.  A
)  /\  -.  n  =  I )  ->  U. ( F `  n )  e.  ( F `  n
) )
1811, 17ifclda 3758 . . 3  |-  ( ( ( ( A  e.  V  /\  F : A
--> Top )  /\  (
I  e.  A  /\  U  e.  ( F `  I ) ) )  /\  n  e.  A
)  ->  if (
n  =  I ,  U ,  U. ( F `  n )
)  e.  ( F `
 n ) )
19 eldifsni 3920 . . . . . 6  |-  ( n  e.  ( A  \  { I } )  ->  n  =/=  I
)
2019neneqd 2614 . . . . 5  |-  ( n  e.  ( A  \  { I } )  ->  -.  n  =  I )
2120adantl 453 . . . 4  |-  ( ( ( ( A  e.  V  /\  F : A
--> Top )  /\  (
I  e.  A  /\  U  e.  ( F `  I ) ) )  /\  n  e.  ( A  \  { I } ) )  ->  -.  n  =  I
)
22 iffalse 3738 . . . 4  |-  ( -.  n  =  I  ->  if ( n  =  I ,  U ,  U. ( F `  n ) )  =  U. ( F `  n )
)
2321, 22syl 16 . . 3  |-  ( ( ( ( A  e.  V  /\  F : A
--> Top )  /\  (
I  e.  A  /\  U  e.  ( F `  I ) ) )  /\  n  e.  ( A  \  { I } ) )  ->  if ( n  =  I ,  U ,  U. ( F `  n ) )  =  U. ( F `  n )
)
243, 4, 6, 18, 23elptr2 17598 . 2  |-  ( ( ( A  e.  V  /\  F : A --> Top )  /\  ( I  e.  A  /\  U  e.  ( F `  I )
) )  ->  X_ n  e.  A  if (
n  =  I ,  U ,  U. ( F `  n )
)  e.  B )
252, 24eqeltrd 2509 1  |-  ( ( ( A  e.  V  /\  F : A --> Top )  /\  ( I  e.  A  /\  U  e.  ( F `  I )
) )  ->  ( `' ( w  e.  X  |->  ( w `  I ) ) " U )  e.  B
)
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 359    /\ w3a 936   E.wex 1550    = wceq 1652    e. wcel 1725   {cab 2421   A.wral 2697   E.wrex 2698    \ cdif 3309   ifcif 3731   {csn 3806   U.cuni 4007    e. cmpt 4258   `'ccnv 4869   "cima 4873    Fn wfn 5441   -->wf 5442   ` cfv 5446   X_cixp 7055   Fincfn 7101   Topctop 16950
This theorem is referenced by:  ptbasfi  17605  ptpjcn  17635
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-rep 4312  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-3or 937  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-reu 2704  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-pss 3328  df-nul 3621  df-if 3732  df-pw 3793  df-sn 3812  df-pr 3813  df-tp 3814  df-op 3815  df-uni 4008  df-iun 4087  df-br 4205  df-opab 4259  df-mpt 4260  df-tr 4295  df-eprel 4486  df-id 4490  df-po 4495  df-so 4496  df-fr 4533  df-we 4535  df-ord 4576  df-on 4577  df-lim 4578  df-suc 4579  df-om 4838  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-f1 5451  df-fo 5452  df-f1o 5453  df-fv 5454  df-1o 6716  df-ixp 7056  df-en 7102  df-fin 7105  df-top 16955
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