Theorem vpwex 5324

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 5325 from vpwex 5324. (Revised by BJ, 10-Aug-2022.)

Assertion

Ref	Expression
vpwex	⊢ 𝒫 𝑥 ∈ V

Proof of Theorem vpwex

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

Step	Hyp	Ref	Expression
1		df-pw 4547	. 2 ⊢ 𝒫 𝑥 = {𝑤 ∣ 𝑤 ⊆ 𝑥}
2		axpow2 5314	. . . . 5 ⊢ ∃𝑦∀𝑧(𝑧 ⊆ 𝑥 → 𝑧 ∈ 𝑦)
3	2	sepexi 5241	. . . 4 ⊢ ∃𝑦∀𝑧(𝑧 ∈ 𝑦 ↔ 𝑧 ⊆ 𝑥)
4		sseq1 3952	. . . . . 6 ⊢ (𝑤 = 𝑧 → (𝑤 ⊆ 𝑥 ↔ 𝑧 ⊆ 𝑥))
5	4	eqabbw 2825	. . . . 5 ⊢ (𝑦 = {𝑤 ∣ 𝑤 ⊆ 𝑥} ↔ ∀𝑧(𝑧 ∈ 𝑦 ↔ 𝑧 ⊆ 𝑥))
6	5	exbii 1858	. . . 4 ⊢ (∃𝑦 𝑦 = {𝑤 ∣ 𝑤 ⊆ 𝑥} ↔ ∃𝑦∀𝑧(𝑧 ∈ 𝑦 ↔ 𝑧 ⊆ 𝑥))
7	3, 6	mpbir 233	. . 3 ⊢ ∃𝑦 𝑦 = {𝑤 ∣ 𝑤 ⊆ 𝑥}
8	7	issetri 3463	. 2 ⊢ {𝑤 ∣ 𝑤 ⊆ 𝑥} ∈ V
9	1, 8	eqeltri 2848	1 ⊢ 𝒫 𝑥 ∈ V

Syntax hints:   ↔ wb 208  ∀wal 1548   = wceq 1550  ∃wex 1789   ∈ wcel 2132  {cab 2730  Vcvv 3444   ⊆ wss 3895  𝒫 cpw 4545

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1805  ax-4 1819  ax-5 1920  ax-6 1977  ax-7 2018  ax-8 2134  ax-9 2142  ax-ext 2724  ax-sep 5236  ax-pow 5312

This theorem depends on definitions:  df-bi 209  df-an 399  df-tru 1553  df-ex 1790  df-sb 2081  df-clab 2731  df-cleq 2744  df-clel 2827  df-v 3446  df-ss 3912  df-pw 4547

This theorem is referenced by:  pwexg  5325  pwnex  7727  inf3lem7  9575  dfac8  10078  dfac13  10085  ackbij1lem8  10168  dominf  10388  numthcor  10437  dominfac  10517  intwun  10679  wunex2  10682  eltsk2g  10695  inttsk  10718  tskcard  10725  intgru  10758  gruina  10762  axgroth6  10772  ismre  17590  fnmre  17591  mreacs  17662  isacs5lem  18549  pmtrfval  19462  istopon  22941  dmtopon  22952  tgdom  23007  isfbas  23858  bj-snglex  37396  exrecfnpw  37813  pwinfi  44078  ntrrn  44636  ntrf  44637  dssmapntrcls  44642  vsetrec  50262  pgindnf  50275