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Theorem supex2g 7231
Description: Existence of supremum. (Contributed by Jeff Madsen, 2-Sep-2009.)
Assertion
Ref Expression
supex2g  |-  ( A  e.  C  ->  sup ( B ,  A ,  R )  e.  _V )

Proof of Theorem supex2g
Dummy variables  x  y  z are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-sup 7182 . 2  |-  sup ( B ,  A ,  R )  =  U. { x  e.  A  |  ( A. y  e.  B  -.  x R y  /\  A. y  e.  A  (
y R x  ->  E. z  e.  B  y R z ) ) }
2 rabexg 4233 . . 3  |-  ( A  e.  C  ->  { x  e.  A  |  ( A. y  e.  B  -.  x R y  /\  A. y  e.  A  ( y R x  ->  E. z  e.  B  y R z ) ) }  e.  _V )
32uniexd 4537 . 2  |-  ( A  e.  C  ->  U. {
x  e.  A  | 
( A. y  e.  B  -.  x R y  /\  A. y  e.  A  ( y R x  ->  E. z  e.  B  y R
z ) ) }  e.  _V )
41, 3eqeltrid 2318 1  |-  ( A  e.  C  ->  sup ( B ,  A ,  R )  e.  _V )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    e. wcel 2202   A.wral 2510   E.wrex 2511   {crab 2514   _Vcvv 2802   U.cuni 3893   class class class wbr 4088   supcsup 7180
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-un 4530
This theorem depends on definitions:  df-bi 117  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-rex 2516  df-rab 2519  df-v 2804  df-in 3206  df-ss 3213  df-uni 3894  df-sup 7182
This theorem is referenced by:  infex2g  7232  pczpre  12869
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