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Theorem bm2.5ii 4313
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 4306 . 2  |-  ( A 
C_  On  ->  U. A  e.  On )
3 unissb 3683 . . . . . 6  |-  ( U. A  C_  x  <->  A. y  e.  A  y  C_  x )
43a1i 9 . . . . 5  |-  ( x  e.  On  ->  ( U. A  C_  x  <->  A. y  e.  A  y  C_  x ) )
54rabbiia 2604 . . . 4  |-  { x  e.  On  |  U. A  C_  x }  =  {
x  e.  On  |  A. y  e.  A  y  C_  x }
65inteqi 3692 . . 3  |-  |^| { x  e.  On  |  U. A  C_  x }  =  |^| { x  e.  On  |  A. y  e.  A  y  C_  x }
7 intmin 3708 . . 3  |-  ( U. A  e.  On  ->  |^|
{ x  e.  On  |  U. A  C_  x }  =  U. A )
86, 7syl5reqr 2135 . 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 103    = wceq 1289    e. wcel 1438   A.wral 2359   {crab 2363   _Vcvv 2619    C_ wss 2999   U.cuni 3653   |^|cint 3688   Oncon0 4190
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 665  ax-5 1381  ax-7 1382  ax-gen 1383  ax-ie1 1427  ax-ie2 1428  ax-8 1440  ax-10 1441  ax-11 1442  ax-i12 1443  ax-bndl 1444  ax-4 1445  ax-13 1449  ax-14 1450  ax-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070  ax-sep 3957  ax-un 4260
This theorem depends on definitions:  df-bi 115  df-3an 926  df-tru 1292  df-nf 1395  df-sb 1693  df-clab 2075  df-cleq 2081  df-clel 2084  df-nfc 2217  df-ral 2364  df-rex 2365  df-rab 2368  df-v 2621  df-in 3005  df-ss 3012  df-uni 3654  df-int 3689  df-tr 3937  df-iord 4193  df-on 4195
This theorem is referenced by: (None)
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