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Theorem rexv 3447
Description: An existential quantifier restricted to the universe is unrestricted. (Contributed by NM, 26-Mar-2004.)
Assertion
Ref Expression
rexv (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥𝜑)

Proof of Theorem rexv
StepHypRef Expression
1 df-rex 3069 . 2 (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑))
2 vex 3426 . . . 4 𝑥 ∈ V
32biantrur 530 . . 3 (𝜑 ↔ (𝑥 ∈ V ∧ 𝜑))
43exbii 1851 . 2 (∃𝑥𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑))
51, 4bitr4i 277 1 (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥𝜑)
Colors of variables: wff setvar class
Syntax hints:  wb 205  wa 395  wex 1783  wcel 2108  wrex 3064  Vcvv 3422
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-ext 2709
This theorem depends on definitions:  df-bi 206  df-an 396  df-tru 1542  df-ex 1784  df-sb 2069  df-clab 2716  df-cleq 2730  df-clel 2817  df-rex 3069  df-v 3424
This theorem is referenced by:  spesbc  3811  exopxfr  5741  elres  5919  elid  6091  dfco2  6138  dfco2a  6139  dffv2  6845  abnex  7585  finacn  9737  ac6s2  10173  ptcmplem3  23113  ustn0  23280  hlimeui  29503  rexcom4f  30720  isrnsiga  31981  prdstotbnd  35879  ac6s3f  36256  moxfr  40430  eldioph2b  40501  kelac1  40804  cbvexsv  42056  sprid  44814
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