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Theorem rexv 3493
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 3062 . 2 (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑))
2 vex 3468 . . . 4 𝑥 ∈ V
32biantrur 530 . . 3 (𝜑 ↔ (𝑥 ∈ V ∧ 𝜑))
43exbii 1848 . 2 (∃𝑥𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑))
51, 4bitr4i 278 1 (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥𝜑)
Colors of variables: wff setvar class
Syntax hints:  wb 206  wa 395  wex 1779  wcel 2109  wrex 3061  Vcvv 3464
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-ext 2708
This theorem depends on definitions:  df-bi 207  df-an 396  df-tru 1543  df-ex 1780  df-sb 2066  df-clab 2715  df-cleq 2728  df-clel 2810  df-rex 3062  df-v 3466
This theorem is referenced by:  spesbc  3862  exopxfr  5828  elres  6012  elid  6193  dfco2  6239  dfco2a  6240  dffv2  6979  abnex  7756  finacn  10069  ac6s2  10505  ptcmplem3  23997  ustn0  24164  hlimeui  31226  rexcom4f  32454  isrnsiga  34149  prdstotbnd  37823  ac6s3f  38200  moxfr  42682  eldioph2b  42753  kelac1  43054  cbvexsv  44539  sprid  47455
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