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Theorem topfne 32349
Description: Fineness for covers corresponds precisely with fineness for topologies. (Contributed by Jeff Hankins, 29-Sep-2009.)
Hypotheses
Ref Expression
topfne.1  |-  X  = 
U. J
topfne.2  |-  Y  = 
U. K
Assertion
Ref Expression
topfne  |-  ( ( K  e.  Top  /\  X  =  Y )  ->  ( J  C_  K  <->  J Fne K ) )

Proof of Theorem topfne
StepHypRef Expression
1 tgtop 20777 . . . 4  |-  ( K  e.  Top  ->  ( topGen `
 K )  =  K )
21sseq2d 3633 . . 3  |-  ( K  e.  Top  ->  ( J  C_  ( topGen `  K
)  <->  J  C_  K ) )
32bicomd 213 . 2  |-  ( K  e.  Top  ->  ( J  C_  K  <->  J  C_  ( topGen `
 K ) ) )
4 topfne.1 . . . 4  |-  X  = 
U. J
5 topfne.2 . . . 4  |-  Y  = 
U. K
64, 5isfne4 32335 . . 3  |-  ( J Fne K  <->  ( X  =  Y  /\  J  C_  ( topGen `  K )
) )
76baibr 945 . 2  |-  ( X  =  Y  ->  ( J  C_  ( topGen `  K
)  <->  J Fne K ) )
83, 7sylan9bb 736 1  |-  ( ( K  e.  Top  /\  X  =  Y )  ->  ( J  C_  K  <->  J Fne K ) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    <-> wb 196    /\ wa 384    = wceq 1483    e. wcel 1990    C_ wss 3574   U.cuni 4436   class class class wbr 4653   ` cfv 5888   topGenctg 16098   Topctop 20698   Fnecfne 32331
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-iota 5851  df-fun 5890  df-fv 5896  df-topgen 16104  df-top 20699  df-fne 32332
This theorem is referenced by: (None)
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