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Theorem mreiincl 13498
Description: A nonempty indexed intersection of closed sets is closed. (Contributed by Stefan O'Rear, 1-Feb-2015.)
Assertion
Ref Expression
mreiincl  |-  ( ( C  e.  (Moore `  X )  /\  I  =/=  (/)  /\  A. y  e.  I  S  e.  C )  ->  |^|_ y  e.  I  S  e.  C )
Distinct variable groups:    y, I    y, X    y, C
Allowed substitution hint:    S( y)

Proof of Theorem mreiincl
Dummy variable  s is distinct from all other variables.
StepHypRef Expression
1 dfiin2g 3936 . . 3  |-  ( A. y  e.  I  S  e.  C  ->  |^|_ y  e.  I  S  =  |^| { s  |  E. y  e.  I  s  =  S } )
213ad2ant3 978 . 2  |-  ( ( C  e.  (Moore `  X )  /\  I  =/=  (/)  /\  A. y  e.  I  S  e.  C )  ->  |^|_ y  e.  I  S  =  |^| { s  |  E. y  e.  I  s  =  S } )
3 simp1 955 . . 3  |-  ( ( C  e.  (Moore `  X )  /\  I  =/=  (/)  /\  A. y  e.  I  S  e.  C )  ->  C  e.  (Moore `  X )
)
4 uniiunlem 3260 . . . . 5  |-  ( A. y  e.  I  S  e.  C  ->  ( A. y  e.  I  S  e.  C  <->  { s  |  E. y  e.  I  s  =  S }  C_  C
) )
54ibi 232 . . . 4  |-  ( A. y  e.  I  S  e.  C  ->  { s  |  E. y  e.  I  s  =  S }  C_  C )
653ad2ant3 978 . . 3  |-  ( ( C  e.  (Moore `  X )  /\  I  =/=  (/)  /\  A. y  e.  I  S  e.  C )  ->  { s  |  E. y  e.  I  s  =  S }  C_  C )
7 n0 3464 . . . . . 6  |-  ( I  =/=  (/)  <->  E. y  y  e.  I )
8 nfra1 2593 . . . . . . . 8  |-  F/ y A. y  e.  I  S  e.  C
9 nfre1 2599 . . . . . . . . . 10  |-  F/ y E. y  e.  I 
s  =  S
109nfab 2423 . . . . . . . . 9  |-  F/_ y { s  |  E. y  e.  I  s  =  S }
11 nfcv 2419 . . . . . . . . 9  |-  F/_ y (/)
1210, 11nfne 2539 . . . . . . . 8  |-  F/ y { s  |  E. y  e.  I  s  =  S }  =/=  (/)
138, 12nfim 1769 . . . . . . 7  |-  F/ y ( A. y  e.  I  S  e.  C  ->  { s  |  E. y  e.  I  s  =  S }  =/=  (/) )
14 rsp 2603 . . . . . . . . . 10  |-  ( A. y  e.  I  S  e.  C  ->  ( y  e.  I  ->  S  e.  C ) )
1514com12 27 . . . . . . . . 9  |-  ( y  e.  I  ->  ( A. y  e.  I  S  e.  C  ->  S  e.  C ) )
16 elisset 2798 . . . . . . . . . . 11  |-  ( S  e.  C  ->  E. s 
s  =  S )
17 rspe 2604 . . . . . . . . . . . 12  |-  ( ( y  e.  I  /\  E. s  s  =  S )  ->  E. y  e.  I  E. s 
s  =  S )
1817ex 423 . . . . . . . . . . 11  |-  ( y  e.  I  ->  ( E. s  s  =  S  ->  E. y  e.  I  E. s  s  =  S ) )
1916, 18syl5 28 . . . . . . . . . 10  |-  ( y  e.  I  ->  ( S  e.  C  ->  E. y  e.  I  E. s  s  =  S
) )
20 rexcom4 2807 . . . . . . . . . 10  |-  ( E. y  e.  I  E. s  s  =  S  <->  E. s E. y  e.  I  s  =  S )
2119, 20syl6ib 217 . . . . . . . . 9  |-  ( y  e.  I  ->  ( S  e.  C  ->  E. s E. y  e.  I  s  =  S ) )
2215, 21syld 40 . . . . . . . 8  |-  ( y  e.  I  ->  ( A. y  e.  I  S  e.  C  ->  E. s E. y  e.  I  s  =  S ) )
23 abn0 3473 . . . . . . . 8  |-  ( { s  |  E. y  e.  I  s  =  S }  =/=  (/)  <->  E. s E. y  e.  I 
s  =  S )
2422, 23syl6ibr 218 . . . . . . 7  |-  ( y  e.  I  ->  ( A. y  e.  I  S  e.  C  ->  { s  |  E. y  e.  I  s  =  S }  =/=  (/) ) )
2513, 24exlimi 1801 . . . . . 6  |-  ( E. y  y  e.  I  ->  ( A. y  e.  I  S  e.  C  ->  { s  |  E. y  e.  I  s  =  S }  =/=  (/) ) )
267, 25sylbi 187 . . . . 5  |-  ( I  =/=  (/)  ->  ( A. y  e.  I  S  e.  C  ->  { s  |  E. y  e.  I  s  =  S }  =/=  (/) ) )
2726imp 418 . . . 4  |-  ( ( I  =/=  (/)  /\  A. y  e.  I  S  e.  C )  ->  { s  |  E. y  e.  I  s  =  S }  =/=  (/) )
28273adant1 973 . . 3  |-  ( ( C  e.  (Moore `  X )  /\  I  =/=  (/)  /\  A. y  e.  I  S  e.  C )  ->  { s  |  E. y  e.  I  s  =  S }  =/=  (/) )
29 mreintcl 13497 . . 3  |-  ( ( C  e.  (Moore `  X )  /\  {
s  |  E. y  e.  I  s  =  S }  C_  C  /\  { s  |  E. y  e.  I  s  =  S }  =/=  (/) )  ->  |^| { s  |  E. y  e.  I  s  =  S }  e.  C
)
303, 6, 28, 29syl3anc 1182 . 2  |-  ( ( C  e.  (Moore `  X )  /\  I  =/=  (/)  /\  A. y  e.  I  S  e.  C )  ->  |^| { s  |  E. y  e.  I  s  =  S }  e.  C )
312, 30eqeltrd 2357 1  |-  ( ( C  e.  (Moore `  X )  /\  I  =/=  (/)  /\  A. y  e.  I  S  e.  C )  ->  |^|_ y  e.  I  S  e.  C )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ w3a 934   E.wex 1528    = wceq 1623    e. wcel 1684   {cab 2269    =/= wne 2446   A.wral 2543   E.wrex 2544    C_ wss 3152   (/)c0 3455   |^|cint 3862   |^|_ciin 3906   ` cfv 5255  Moorecmre 13484
This theorem is referenced by:  mreriincl  13500  mretopd  16829
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-ral 2548  df-rex 2549  df-rab 2552  df-v 2790  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-op 3649  df-uni 3828  df-int 3863  df-iin 3908  df-br 4024  df-opab 4078  df-mpt 4079  df-id 4309  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-iota 5219  df-fun 5257  df-fv 5263  df-mre 13488
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