Theorem vpwex 4292

Description: Power set axiom: the powerclass of a set is a set. Axiom 4 of [TakeutiZaring] p. 17. (Contributed by NM, 30-Oct-2003.) (Proof shortened by Andrew Salmon, 25-Jul-2011.) Revised to prove pwexg 4293 from vpwex 4292. (Revised by BJ, 10-Aug-2022.)

Assertion

Ref	Expression
vpwex	|- ~P x e. _V

Proof of Theorem vpwex

Dummy variables y z are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-pw 3671	. 2 |- ~P x = { y | y C_ x }
2		axpow2 4289	. . . . 5 |- E. z A. y ( y C_ x -> y e. z )
3	2	bm1.3ii 4231	. . . 4 |- E. z A. y ( y e. z <-> y C_ x )
4		abeq2 2341	. . . . 5 |- ( z = { y | y C_ x } <-> A. y ( y e. z <-> y C_ x ) )
5	4	exbii 1654	. . . 4 |- ( E. z z = { y | y C_ x } <-> E. z A. y ( y e. z <-> y C_ x ) )
6	3, 5	mpbir 146	. . 3 |- E. z z = { y | y C_ x }
7	6	issetri 2823	. 2 |- { y | y C_ x } e. _V
8	1, 7	eqeltri 2305	1 |- ~P x e. _V

Syntax hints:   <-> wb 105   A.wal 1396   = wceq 1398   E.wex 1541   e. wcel 2203   {cab 2218   _Vcvv 2813   C_ wss 3211   ~Pcpw 3669

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-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-11 1555  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287

This theorem depends on definitions:  df-bi 117  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-v 2815  df-in 3217  df-ss 3224  df-pw 3671

This theorem is referenced by:  pwexg  4293  pwnex  4570  exmidpw2en  7172  metuex  14703  istopon  14878  dmtopon  14888  tgdom  14937