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Theorem vuniex 4473
Description: The union of a setvar is a set. (Contributed by BJ, 3-May-2021.)
Assertion
Ref Expression
vuniex  |-  U. x  e.  _V

Proof of Theorem vuniex
StepHypRef Expression
1 vex 2766 . 2  |-  x  e. 
_V
21uniex 4472 1  |-  U. x  e.  _V
Colors of variables: wff set class
Syntax hints:    e. wcel 2167   _Vcvv 2763   U.cuni 3839
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 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-13 2169  ax-14 2170  ax-ext 2178  ax-sep 4151  ax-un 4468
This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-rex 2481  df-v 2765  df-uni 3840
This theorem is referenced by:  omp1eomlem  7160  distop  14321  epttop  14326  fncld  14334
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