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Theorem qsexg 6859
Description: A quotient set exists. (Contributed by FL, 19-May-2007.) (Revised by Mario Carneiro, 9-Jul-2014.)
Assertion
Ref Expression
qsexg  |-  ( A  e.  V  ->  ( A /. R )  e. 
_V )

Proof of Theorem qsexg
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-qs 6807 . 2  |-  ( A /. R )  =  { y  |  E. x  e.  A  y  =  [ x ] R }
2 abrexexg 6341 . 2  |-  ( A  e.  V  ->  { y  |  E. x  e.  A  y  =  [
x ] R }  e.  _V )
31, 2eqeltrid 2325 1  |-  ( A  e.  V  ->  ( A /. R )  e. 
_V )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1402    e. wcel 2209   {cab 2224   E.wrex 2529   _Vcvv 2821   [cec 6799   /.cqs 6800
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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4244  ax-sep 4247  ax-pow 4309  ax-pr 4344  ax-un 4576
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-uni 3934  df-iun 4012  df-br 4129  df-opab 4191  df-mpt 4192  df-id 4436  df-xp 4778  df-rel 4779  df-cnv 4780  df-co 4781  df-dm 4782  df-rn 4783  df-res 4784  df-ima 4785  df-iota 5335  df-fun 5377  df-fn 5378  df-f 5379  df-f1 5380  df-fo 5381  df-f1o 5382  df-fv 5383  df-qs 6807
This theorem is referenced by:  qsex  6860
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