Theorem vprc 4068

Description: The universal class is not a member of itself (and thus is not a set). Proposition 5.21 of [TakeutiZaring] p. 21; our proof, however, does not depend on the Axiom of Regularity. (Contributed by NM, 23-Aug-1993.)

Assertion

Ref	Expression
vprc	|- -. _V e. _V

Proof of Theorem vprc

Step	Hyp	Ref	Expression
1		vnex 4067	. 2 |- -. E. x x = _V
2		isset 2695	. 2 |- ( _V e. _V <-> E. x x = _V )
3	1, 2	mtbir 661	1 |- -. _V e. _V

Syntax hints:   -. wn 3   = wceq 1332   E.wex 1469   e. wcel 1481   _Vcvv 2689

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-5 1424  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-4 1488  ax-13 1492  ax-14 1493  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-ext 2122  ax-sep 4054

This theorem depends on definitions:  df-bi 116  df-tru 1335  df-fal 1338  df-nf 1438  df-sb 1737  df-clab 2127  df-cleq 2133  df-clel 2136  df-v 2691

This theorem is referenced by:  nvel  4069  intexr  4083  intnexr  4084  abnex  4376  snnex  4377  ruALT  4474  dcextest  4503  iprc  4815  snexxph  6846  elfi2  6868  fi0  6871