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Theorem fcfelbas 17731
Description: A cluster point of a function is in the base set of the topology. (Contributed by Jeff Hankins, 26-Nov-2009.) (Revised by Stefan O'Rear, 9-Aug-2015.)
Assertion
Ref Expression
fcfelbas  |-  ( ( ( J  e.  (TopOn `  X )  /\  L  e.  ( Fil `  Y
)  /\  F : Y
--> X )  /\  A  e.  ( ( J  fClusf  L ) `  F ) )  ->  A  e.  X )

Proof of Theorem fcfelbas
StepHypRef Expression
1 fcfval 17728 . . . . 5  |-  ( ( J  e.  (TopOn `  X )  /\  L  e.  ( Fil `  Y
)  /\  F : Y
--> X )  ->  (
( J  fClusf  L ) `
 F )  =  ( J  fClus  ( ( X  FilMap  F ) `  L ) ) )
21eleq2d 2350 . . . 4  |-  ( ( J  e.  (TopOn `  X )  /\  L  e.  ( Fil `  Y
)  /\  F : Y
--> X )  ->  ( A  e.  ( ( J  fClusf  L ) `  F )  <->  A  e.  ( J  fClus  ( ( X  FilMap  F ) `  L ) ) ) )
3 eqid 2283 . . . . 5  |-  U. J  =  U. J
43fclselbas 17711 . . . 4  |-  ( A  e.  ( J  fClus  ( ( X  FilMap  F ) `
 L ) )  ->  A  e.  U. J )
52, 4syl6bi 219 . . 3  |-  ( ( J  e.  (TopOn `  X )  /\  L  e.  ( Fil `  Y
)  /\  F : Y
--> X )  ->  ( A  e.  ( ( J  fClusf  L ) `  F )  ->  A  e.  U. J ) )
65imp 418 . 2  |-  ( ( ( J  e.  (TopOn `  X )  /\  L  e.  ( Fil `  Y
)  /\  F : Y
--> X )  /\  A  e.  ( ( J  fClusf  L ) `  F ) )  ->  A  e.  U. J )
7 simpl1 958 . . 3  |-  ( ( ( J  e.  (TopOn `  X )  /\  L  e.  ( Fil `  Y
)  /\  F : Y
--> X )  /\  A  e.  ( ( J  fClusf  L ) `  F ) )  ->  J  e.  (TopOn `  X ) )
8 toponuni 16665 . . 3  |-  ( J  e.  (TopOn `  X
)  ->  X  =  U. J )
97, 8syl 15 . 2  |-  ( ( ( J  e.  (TopOn `  X )  /\  L  e.  ( Fil `  Y
)  /\  F : Y
--> X )  /\  A  e.  ( ( J  fClusf  L ) `  F ) )  ->  X  =  U. J )
106, 9eleqtrrd 2360 1  |-  ( ( ( J  e.  (TopOn `  X )  /\  L  e.  ( Fil `  Y
)  /\  F : Y
--> X )  /\  A  e.  ( ( J  fClusf  L ) `  F ) )  ->  A  e.  X )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 358    /\ w3a 934    = wceq 1623    e. wcel 1684   U.cuni 3827   -->wf 5251   ` cfv 5255  (class class class)co 5858  TopOnctopon 16632   Filcfil 17540    FilMap cfm 17628    fClus cfcls 17631    fClusf cfcf 17632
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-rep 4131  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512
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-nel 2449  df-ral 2548  df-rex 2549  df-reu 2550  df-rab 2552  df-v 2790  df-sbc 2992  df-csb 3082  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-iun 3907  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-rn 4700  df-res 4701  df-ima 4702  df-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-ov 5861  df-oprab 5862  df-mpt2 5863  df-map 6774  df-top 16636  df-topon 16639  df-cld 16756  df-ntr 16757  df-cls 16758  df-fbas 17520  df-fil 17541  df-fcls 17636  df-fcf 17637
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