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Theorem bm2.5ii 4544
Description: Problem 2.5(ii) of [BellMachover] p. 471. (Contributed by NM, 20-Sep-2003.)
Hypothesis
Ref Expression
bm2.5ii.1  |-  A  e. 
_V
Assertion
Ref Expression
bm2.5ii  |-  ( A 
C_  On  ->  U. A  =  |^| { x  e.  On  |  A. y  e.  A  y  C_  x } )
Distinct variable group:    x, y, A

Proof of Theorem bm2.5ii
StepHypRef Expression
1 bm2.5ii.1 . . 3  |-  A  e. 
_V
21ssonunii 4537 . 2  |-  ( A 
C_  On  ->  U. A  e.  On )
3 intmin 3905 . . 3  |-  ( U. A  e.  On  ->  |^|
{ x  e.  On  |  U. A  C_  x }  =  U. A )
4 unissb 3880 . . . . . 6  |-  ( U. A  C_  x  <->  A. y  e.  A  y  C_  x )
54a1i 9 . . . . 5  |-  ( x  e.  On  ->  ( U. A  C_  x  <->  A. y  e.  A  y  C_  x ) )
65rabbiia 2757 . . . 4  |-  { x  e.  On  |  U. A  C_  x }  =  {
x  e.  On  |  A. y  e.  A  y  C_  x }
76inteqi 3889 . . 3  |-  |^| { x  e.  On  |  U. A  C_  x }  =  |^| { x  e.  On  |  A. y  e.  A  y  C_  x }
83, 7eqtr3di 2253 . 2  |-  ( U. A  e.  On  ->  U. A  =  |^| { x  e.  On  |  A. y  e.  A  y  C_  x } )
92, 8syl 14 1  |-  ( A 
C_  On  ->  U. A  =  |^| { x  e.  On  |  A. y  e.  A  y  C_  x } )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 105    = wceq 1373    e. wcel 2176   A.wral 2484   {crab 2488   _Vcvv 2772    C_ wss 3166   U.cuni 3850   |^|cint 3885   Oncon0 4410
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 711  ax-5 1470  ax-7 1471  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-8 1527  ax-10 1528  ax-11 1529  ax-i12 1530  ax-bndl 1532  ax-4 1533  ax-17 1549  ax-i9 1553  ax-ial 1557  ax-i5r 1558  ax-13 2178  ax-14 2179  ax-ext 2187  ax-sep 4162  ax-un 4480
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1484  df-sb 1786  df-clab 2192  df-cleq 2198  df-clel 2201  df-nfc 2337  df-ral 2489  df-rex 2490  df-rab 2493  df-v 2774  df-in 3172  df-ss 3179  df-uni 3851  df-int 3886  df-tr 4143  df-iord 4413  df-on 4415
This theorem is referenced by: (None)
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