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Theorem isfne3 32338
Description: The predicate " B is finer than  A." (Contributed by Jeff Hankins, 11-Oct-2009.) (Proof shortened by Mario Carneiro, 11-Sep-2015.)
Hypotheses
Ref Expression
isfne.1  |-  X  = 
U. A
isfne.2  |-  Y  = 
U. B
Assertion
Ref Expression
isfne3  |-  ( B  e.  C  ->  ( A Fne B  <->  ( X  =  Y  /\  A. x  e.  A  E. y
( y  C_  B  /\  x  =  U. y ) ) ) )
Distinct variable groups:    x, y, A    x, B, y    x, C, y
Allowed substitution hints:    X( x, y)    Y( x, y)

Proof of Theorem isfne3
StepHypRef Expression
1 isfne.1 . . 3  |-  X  = 
U. A
2 isfne.2 . . 3  |-  Y  = 
U. B
31, 2isfne4 32335 . 2  |-  ( A Fne B  <->  ( X  =  Y  /\  A  C_  ( topGen `  B )
) )
4 dfss3 3592 . . . 4  |-  ( A 
C_  ( topGen `  B
)  <->  A. x  e.  A  x  e.  ( topGen `  B ) )
5 eltg3 20766 . . . . 5  |-  ( B  e.  C  ->  (
x  e.  ( topGen `  B )  <->  E. y
( y  C_  B  /\  x  =  U. y ) ) )
65ralbidv 2986 . . . 4  |-  ( B  e.  C  ->  ( A. x  e.  A  x  e.  ( topGen `  B )  <->  A. x  e.  A  E. y
( y  C_  B  /\  x  =  U. y ) ) )
74, 6syl5bb 272 . . 3  |-  ( B  e.  C  ->  ( A  C_  ( topGen `  B
)  <->  A. x  e.  A  E. y ( y  C_  B  /\  x  =  U. y ) ) )
87anbi2d 740 . 2  |-  ( B  e.  C  ->  (
( X  =  Y  /\  A  C_  ( topGen `
 B ) )  <-> 
( X  =  Y  /\  A. x  e.  A  E. y ( y  C_  B  /\  x  =  U. y
) ) ) )
93, 8syl5bb 272 1  |-  ( B  e.  C  ->  ( A Fne B  <->  ( X  =  Y  /\  A. x  e.  A  E. y
( y  C_  B  /\  x  =  U. y ) ) ) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    <-> wb 196    /\ wa 384    = wceq 1483   E.wex 1704    e. wcel 1990   A.wral 2912    C_ wss 3574   U.cuni 4436   class class class wbr 4653   ` cfv 5888   topGenctg 16098   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-fne 32332
This theorem is referenced by: (None)
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