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Theorem pwv 3782
Description: The power class of the universe is the universe. Exercise 4.12(d) of [Mendelson] p. 235. (Contributed by NM, 14-Sep-2003.)
Assertion
Ref Expression
pwv 𝒫 V = V

Proof of Theorem pwv
StepHypRef Expression
1 ssv 3159 . . . 4 𝑥 ⊆ V
2 vex 2724 . . . . 5 𝑥 ∈ V
32elpw 3559 . . . 4 (𝑥 ∈ 𝒫 V ↔ 𝑥 ⊆ V)
41, 3mpbir 145 . . 3 𝑥 ∈ 𝒫 V
54, 22th 173 . 2 (𝑥 ∈ 𝒫 V ↔ 𝑥 ∈ V)
65eqriv 2161 1 𝒫 V = V
Colors of variables: wff set class
Syntax hints:   = wceq 1342  wcel 2135  Vcvv 2721  wss 3111  𝒫 cpw 3553
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-io 699  ax-5 1434  ax-7 1435  ax-gen 1436  ax-ie1 1480  ax-ie2 1481  ax-8 1491  ax-10 1492  ax-11 1493  ax-i12 1494  ax-bndl 1496  ax-4 1497  ax-17 1513  ax-i9 1517  ax-ial 1521  ax-i5r 1522  ax-ext 2146
This theorem depends on definitions:  df-bi 116  df-tru 1345  df-nf 1448  df-sb 1750  df-clab 2151  df-cleq 2157  df-clel 2160  df-nfc 2295  df-v 2723  df-in 3117  df-ss 3124  df-pw 3555
This theorem is referenced by:  univ  4448
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