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Theorem isfild 17890
Description: Sufficient condition for a set of the form  { x  e.  ~P A  |  ph } to be a filter. (Contributed by Mario Carneiro, 1-Dec-2013.) (Revised by Stefan O'Rear, 2-Aug-2015.)
Hypotheses
Ref Expression
isfild.1  |-  ( ph  ->  ( x  e.  F  <->  ( x  C_  A  /\  ps ) ) )
isfild.2  |-  ( ph  ->  A  e.  _V )
isfild.3  |-  ( ph  ->  [. A  /  x ]. ps )
isfild.4  |-  ( ph  ->  -.  [. (/)  /  x ]. ps )
isfild.5  |-  ( (
ph  /\  y  C_  A  /\  z  C_  y
)  ->  ( [. z  /  x ]. ps  ->  [. y  /  x ]. ps ) )
isfild.6  |-  ( (
ph  /\  y  C_  A  /\  z  C_  A
)  ->  ( ( [. y  /  x ]. ps  /\  [. z  /  x ]. ps )  ->  [. ( y  i^i  z )  /  x ]. ps ) )
Assertion
Ref Expression
isfild  |-  ( ph  ->  F  e.  ( Fil `  A ) )
Distinct variable groups:    x, y, A    z, A    x, F, y    y, z, F    ph, x, y    ph, z    ps, y
Allowed substitution hints:    ps( x, z)

Proof of Theorem isfild
StepHypRef Expression
1 isfild.1 . . . . 5  |-  ( ph  ->  ( x  e.  F  <->  ( x  C_  A  /\  ps ) ) )
2 vex 2959 . . . . . . . 8  |-  x  e. 
_V
32elpw 3805 . . . . . . 7  |-  ( x  e.  ~P A  <->  x  C_  A
)
43biimpri 198 . . . . . 6  |-  ( x 
C_  A  ->  x  e.  ~P A )
54adantr 452 . . . . 5  |-  ( ( x  C_  A  /\  ps )  ->  x  e. 
~P A )
61, 5syl6bi 220 . . . 4  |-  ( ph  ->  ( x  e.  F  ->  x  e.  ~P A
) )
76ssrdv 3354 . . 3  |-  ( ph  ->  F  C_  ~P A
)
8 isfild.4 . . . 4  |-  ( ph  ->  -.  [. (/)  /  x ]. ps )
9 isfild.2 . . . . . 6  |-  ( ph  ->  A  e.  _V )
101, 9isfildlem 17889 . . . . 5  |-  ( ph  ->  ( (/)  e.  F  <->  (
(/)  C_  A  /\  [. (/)  /  x ]. ps ) ) )
11 simpr 448 . . . . 5  |-  ( (
(/)  C_  A  /\  [. (/)  /  x ]. ps )  ->  [. (/)  /  x ]. ps )
1210, 11syl6bi 220 . . . 4  |-  ( ph  ->  ( (/)  e.  F  ->  [. (/)  /  x ]. ps ) )
138, 12mtod 170 . . 3  |-  ( ph  ->  -.  (/)  e.  F )
14 isfild.3 . . . . 5  |-  ( ph  ->  [. A  /  x ]. ps )
15 ssid 3367 . . . . 5  |-  A  C_  A
1614, 15jctil 524 . . . 4  |-  ( ph  ->  ( A  C_  A  /\  [. A  /  x ]. ps ) )
171, 9isfildlem 17889 . . . 4  |-  ( ph  ->  ( A  e.  F  <->  ( A  C_  A  /\  [. A  /  x ]. ps ) ) )
1816, 17mpbird 224 . . 3  |-  ( ph  ->  A  e.  F )
197, 13, 183jca 1134 . 2  |-  ( ph  ->  ( F  C_  ~P A  /\  -.  (/)  e.  F  /\  A  e.  F
) )
20 elpwi 3807 . . . 4  |-  ( y  e.  ~P A  -> 
y  C_  A )
21 isfild.5 . . . . . . . . . . 11  |-  ( (
ph  /\  y  C_  A  /\  z  C_  y
)  ->  ( [. z  /  x ]. ps  ->  [. y  /  x ]. ps ) )
22 simp2 958 . . . . . . . . . . 11  |-  ( (
ph  /\  y  C_  A  /\  z  C_  y
)  ->  y  C_  A )
2321, 22jctild 528 . . . . . . . . . 10  |-  ( (
ph  /\  y  C_  A  /\  z  C_  y
)  ->  ( [. z  /  x ]. ps  ->  ( y  C_  A  /\  [. y  /  x ]. ps ) ) )
2423adantld 454 . . . . . . . . 9  |-  ( (
ph  /\  y  C_  A  /\  z  C_  y
)  ->  ( (
z  C_  A  /\  [. z  /  x ]. ps )  ->  ( y 
C_  A  /\  [. y  /  x ]. ps )
) )
251, 9isfildlem 17889 . . . . . . . . . 10  |-  ( ph  ->  ( z  e.  F  <->  ( z  C_  A  /\  [. z  /  x ]. ps ) ) )
26253ad2ant1 978 . . . . . . . . 9  |-  ( (
ph  /\  y  C_  A  /\  z  C_  y
)  ->  ( z  e.  F  <->  ( z  C_  A  /\  [. z  /  x ]. ps ) ) )
271, 9isfildlem 17889 . . . . . . . . . 10  |-  ( ph  ->  ( y  e.  F  <->  ( y  C_  A  /\  [. y  /  x ]. ps ) ) )
28273ad2ant1 978 . . . . . . . . 9  |-  ( (
ph  /\  y  C_  A  /\  z  C_  y
)  ->  ( y  e.  F  <->  ( y  C_  A  /\  [. y  /  x ]. ps ) ) )
2924, 26, 283imtr4d 260 . . . . . . . 8  |-  ( (
ph  /\  y  C_  A  /\  z  C_  y
)  ->  ( z  e.  F  ->  y  e.  F ) )
30293expa 1153 . . . . . . 7  |-  ( ( ( ph  /\  y  C_  A )  /\  z  C_  y )  ->  (
z  e.  F  -> 
y  e.  F ) )
3130impancom 428 . . . . . 6  |-  ( ( ( ph  /\  y  C_  A )  /\  z  e.  F )  ->  (
z  C_  y  ->  y  e.  F ) )
3231rexlimdva 2830 . . . . 5  |-  ( (
ph  /\  y  C_  A )  ->  ( E. z  e.  F  z  C_  y  ->  y  e.  F ) )
3332ex 424 . . . 4  |-  ( ph  ->  ( y  C_  A  ->  ( E. z  e.  F  z  C_  y  ->  y  e.  F ) ) )
3420, 33syl5 30 . . 3  |-  ( ph  ->  ( y  e.  ~P A  ->  ( E. z  e.  F  z  C_  y  ->  y  e.  F
) ) )
3534ralrimiv 2788 . 2  |-  ( ph  ->  A. y  e.  ~P  A ( E. z  e.  F  z  C_  y  ->  y  e.  F
) )
36 ssinss1 3569 . . . . . . 7  |-  ( y 
C_  A  ->  (
y  i^i  z )  C_  A )
3736ad2antrr 707 . . . . . 6  |-  ( ( ( y  C_  A  /\  [. y  /  x ]. ps )  /\  (
z  C_  A  /\  [. z  /  x ]. ps ) )  ->  (
y  i^i  z )  C_  A )
3837a1i 11 . . . . 5  |-  ( ph  ->  ( ( ( y 
C_  A  /\  [. y  /  x ]. ps )  /\  ( z  C_  A  /\  [. z  /  x ]. ps ) )  -> 
( y  i^i  z
)  C_  A )
)
39 an4 798 . . . . . 6  |-  ( ( ( y  C_  A  /\  [. y  /  x ]. ps )  /\  (
z  C_  A  /\  [. z  /  x ]. ps ) )  <->  ( (
y  C_  A  /\  z  C_  A )  /\  ( [. y  /  x ]. ps  /\  [. z  /  x ]. ps )
) )
40 isfild.6 . . . . . . . 8  |-  ( (
ph  /\  y  C_  A  /\  z  C_  A
)  ->  ( ( [. y  /  x ]. ps  /\  [. z  /  x ]. ps )  ->  [. ( y  i^i  z )  /  x ]. ps ) )
41403expb 1154 . . . . . . 7  |-  ( (
ph  /\  ( y  C_  A  /\  z  C_  A ) )  -> 
( ( [. y  /  x ]. ps  /\  [. z  /  x ]. ps )  ->  [. (
y  i^i  z )  /  x ]. ps )
)
4241expimpd 587 . . . . . 6  |-  ( ph  ->  ( ( ( y 
C_  A  /\  z  C_  A )  /\  ( [. y  /  x ]. ps  /\  [. z  /  x ]. ps )
)  ->  [. ( y  i^i  z )  /  x ]. ps ) )
4339, 42syl5bi 209 . . . . 5  |-  ( ph  ->  ( ( ( y 
C_  A  /\  [. y  /  x ]. ps )  /\  ( z  C_  A  /\  [. z  /  x ]. ps ) )  ->  [. ( y  i^i  z
)  /  x ]. ps ) )
4438, 43jcad 520 . . . 4  |-  ( ph  ->  ( ( ( y 
C_  A  /\  [. y  /  x ]. ps )  /\  ( z  C_  A  /\  [. z  /  x ]. ps ) )  -> 
( ( y  i^i  z )  C_  A  /\  [. ( y  i^i  z )  /  x ]. ps ) ) )
4527, 25anbi12d 692 . . . 4  |-  ( ph  ->  ( ( y  e.  F  /\  z  e.  F )  <->  ( (
y  C_  A  /\  [. y  /  x ]. ps )  /\  (
z  C_  A  /\  [. z  /  x ]. ps ) ) ) )
461, 9isfildlem 17889 . . . 4  |-  ( ph  ->  ( ( y  i^i  z )  e.  F  <->  ( ( y  i^i  z
)  C_  A  /\  [. ( y  i^i  z
)  /  x ]. ps ) ) )
4744, 45, 463imtr4d 260 . . 3  |-  ( ph  ->  ( ( y  e.  F  /\  z  e.  F )  ->  (
y  i^i  z )  e.  F ) )
4847ralrimivv 2797 . 2  |-  ( ph  ->  A. y  e.  F  A. z  e.  F  ( y  i^i  z
)  e.  F )
49 isfil2 17888 . 2  |-  ( F  e.  ( Fil `  A
)  <->  ( ( F 
C_  ~P A  /\  -.  (/) 
e.  F  /\  A  e.  F )  /\  A. y  e.  ~P  A
( E. z  e.  F  z  C_  y  ->  y  e.  F )  /\  A. y  e.  F  A. z  e.  F  ( y  i^i  z )  e.  F
) )
5019, 35, 48, 49syl3anbrc 1138 1  |-  ( ph  ->  F  e.  ( Fil `  A ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    <-> wb 177    /\ wa 359    /\ w3a 936    e. wcel 1725   A.wral 2705   E.wrex 2706   _Vcvv 2956   [.wsbc 3161    i^i cin 3319    C_ wss 3320   (/)c0 3628   ~Pcpw 3799   ` cfv 5454   Filcfil 17877
This theorem is referenced by:  snfil  17896  fgcl  17910  filuni  17917  cfinfil  17925  csdfil  17926  supfil  17927  fin1aufil  17964
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 2417  ax-sep 4330  ax-nul 4338  ax-pow 4377  ax-pr 4403
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 2285  df-mo 2286  df-clab 2423  df-cleq 2429  df-clel 2432  df-nfc 2561  df-ne 2601  df-nel 2602  df-ral 2710  df-rex 2711  df-rab 2714  df-v 2958  df-sbc 3162  df-csb 3252  df-dif 3323  df-un 3325  df-in 3327  df-ss 3334  df-nul 3629  df-if 3740  df-pw 3801  df-sn 3820  df-pr 3821  df-op 3823  df-uni 4016  df-br 4213  df-opab 4267  df-mpt 4268  df-id 4498  df-xp 4884  df-rel 4885  df-cnv 4886  df-co 4887  df-dm 4888  df-rn 4889  df-res 4890  df-ima 4891  df-iota 5418  df-fun 5456  df-fv 5462  df-fbas 16699  df-fil 17878
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