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Theorem fgtr 17601
Description: If  A is a member of the filter, then truncating  F to  A and regenerating the behavior outside  A using 
filGen recovers the original filter. (Contributed by Mario Carneiro, 15-Oct-2015.)
Assertion
Ref Expression
fgtr  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  ( X filGen ( Ft  A ) )  =  F )

Proof of Theorem fgtr
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 filfbas 17559 . . . . . . . 8  |-  ( F  e.  ( Fil `  X
)  ->  F  e.  ( fBas `  X )
)
2 fbncp 17550 . . . . . . . 8  |-  ( ( F  e.  ( fBas `  X )  /\  A  e.  F )  ->  -.  ( X  \  A )  e.  F )
31, 2sylan 457 . . . . . . 7  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  -.  ( X  \  A )  e.  F )
4 filelss 17563 . . . . . . . 8  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  A  C_  X )
5 trfil3 17599 . . . . . . . 8  |-  ( ( F  e.  ( Fil `  X )  /\  A  C_  X )  ->  (
( Ft  A )  e.  ( Fil `  A )  <->  -.  ( X  \  A
)  e.  F ) )
64, 5syldan 456 . . . . . . 7  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  (
( Ft  A )  e.  ( Fil `  A )  <->  -.  ( X  \  A
)  e.  F ) )
73, 6mpbird 223 . . . . . 6  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  ( Ft  A )  e.  ( Fil `  A ) )
8 filfbas 17559 . . . . . 6  |-  ( ( Ft  A )  e.  ( Fil `  A )  ->  ( Ft  A )  e.  ( fBas `  A
) )
97, 8syl 15 . . . . 5  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  ( Ft  A )  e.  (
fBas `  A )
)
10 restsspw 13352 . . . . . 6  |-  ( Ft  A )  C_  ~P A
11 sspwb 4239 . . . . . . 7  |-  ( A 
C_  X  <->  ~P A  C_ 
~P X )
124, 11sylib 188 . . . . . 6  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  ~P A  C_  ~P X )
1310, 12syl5ss 3203 . . . . 5  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  ( Ft  A )  C_  ~P X )
14 filtop 17566 . . . . . 6  |-  ( F  e.  ( Fil `  X
)  ->  X  e.  F )
1514adantr 451 . . . . 5  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  X  e.  F )
16 fbasweak 17576 . . . . 5  |-  ( ( ( Ft  A )  e.  (
fBas `  A )  /\  ( Ft  A )  C_  ~P X  /\  X  e.  F
)  ->  ( Ft  A
)  e.  ( fBas `  X ) )
179, 13, 15, 16syl3anc 1182 . . . 4  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  ( Ft  A )  e.  (
fBas `  X )
)
181adantr 451 . . . 4  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  F  e.  ( fBas `  X
) )
19 trfilss 17600 . . . 4  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  ( Ft  A )  C_  F
)
20 fgss 17584 . . . 4  |-  ( ( ( Ft  A )  e.  (
fBas `  X )  /\  F  e.  ( fBas `  X )  /\  ( Ft  A )  C_  F
)  ->  ( X filGen ( Ft  A ) )  C_  ( X filGen F ) )
2117, 18, 19, 20syl3anc 1182 . . 3  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  ( X filGen ( Ft  A ) )  C_  ( X filGen F ) )
22 fgfil 17586 . . . 4  |-  ( F  e.  ( Fil `  X
)  ->  ( X filGen F )  =  F )
2322adantr 451 . . 3  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  ( X filGen F )  =  F )
2421, 23sseqtrd 3227 . 2  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  ( X filGen ( Ft  A ) )  C_  F )
25 filelss 17563 . . . . . . 7  |-  ( ( F  e.  ( Fil `  X )  /\  x  e.  F )  ->  x  C_  X )
2625ex 423 . . . . . 6  |-  ( F  e.  ( Fil `  X
)  ->  ( x  e.  F  ->  x  C_  X ) )
2726adantr 451 . . . . 5  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  (
x  e.  F  ->  x  C_  X ) )
28 elrestr 13349 . . . . . . . 8  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F  /\  x  e.  F )  ->  (
x  i^i  A )  e.  ( Ft  A ) )
29283expa 1151 . . . . . . 7  |-  ( ( ( F  e.  ( Fil `  X )  /\  A  e.  F
)  /\  x  e.  F )  ->  (
x  i^i  A )  e.  ( Ft  A ) )
30 inss1 3402 . . . . . . 7  |-  ( x  i^i  A )  C_  x
31 sseq1 3212 . . . . . . . 8  |-  ( y  =  ( x  i^i 
A )  ->  (
y  C_  x  <->  ( x  i^i  A )  C_  x
) )
3231rspcev 2897 . . . . . . 7  |-  ( ( ( x  i^i  A
)  e.  ( Ft  A )  /\  ( x  i^i  A )  C_  x )  ->  E. y  e.  ( Ft  A ) y  C_  x )
3329, 30, 32sylancl 643 . . . . . 6  |-  ( ( ( F  e.  ( Fil `  X )  /\  A  e.  F
)  /\  x  e.  F )  ->  E. y  e.  ( Ft  A ) y  C_  x )
3433ex 423 . . . . 5  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  (
x  e.  F  ->  E. y  e.  ( Ft  A ) y  C_  x ) )
3527, 34jcad 519 . . . 4  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  (
x  e.  F  -> 
( x  C_  X  /\  E. y  e.  ( Ft  A ) y  C_  x ) ) )
36 elfg 17582 . . . . 5  |-  ( ( Ft  A )  e.  (
fBas `  X )  ->  ( x  e.  ( X filGen ( Ft  A ) )  <->  ( x  C_  X  /\  E. y  e.  ( Ft  A ) y  C_  x ) ) )
3717, 36syl 15 . . . 4  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  (
x  e.  ( X
filGen ( Ft  A ) )  <->  ( x  C_  X  /\  E. y  e.  ( Ft  A ) y  C_  x ) ) )
3835, 37sylibrd 225 . . 3  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  (
x  e.  F  ->  x  e.  ( X filGen ( Ft  A ) ) ) )
3938ssrdv 3198 . 2  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  F  C_  ( X filGen ( Ft  A ) ) )
4024, 39eqssd 3209 1  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  ( X filGen ( Ft  A ) )  =  F )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    <-> wb 176    /\ wa 358    = wceq 1632    e. wcel 1696   E.wrex 2557    \ cdif 3162    i^i cin 3164    C_ wss 3165   ~Pcpw 3638   ` cfv 5271  (class class class)co 5874   ↾t crest 13341   fBascfbas 17534   filGencfg 17535   Filcfil 17556
This theorem is referenced by:  cfilres  18738
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-nel 2462  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-1st 6138  df-2nd 6139  df-rest 13343  df-fbas 17536  df-fg 17537  df-fil 17557
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