Theorem rexv 3458

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

Step	Hyp	Ref	Expression
1		df-rex 3071	. 2 ⊢ (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑))
2		vex 3437	. . . 4 ⊢ 𝑥 ∈ V
3	2	biantrur 531	. . 3 ⊢ (𝜑 ↔ (𝑥 ∈ V ∧ 𝜑))
4	3	exbii 1851	. 2 ⊢ (∃𝑥𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑))
5	1, 4	bitr4i 277	1 ⊢ (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥𝜑)

Syntax hints:   ↔ wb 205   ∧ wa 396  ∃wex 1782   ∈ wcel 2107  ∃wrex 3066  Vcvv 3433

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-ext 2710

This theorem depends on definitions:  df-bi 206  df-an 397  df-tru 1542  df-ex 1783  df-sb 2069  df-clab 2717  df-cleq 2731  df-clel 2817  df-rex 3071  df-v 3435

This theorem is referenced by:  spesbc  3816  exopxfr  5755  elres  5933  elid  6107  dfco2  6153  dfco2a  6154  dffv2  6872  abnex  7616  finacn  9815  ac6s2  10251  ptcmplem3  23214  ustn0  23381  hlimeui  29611  rexcom4f  30828  isrnsiga  32090  prdstotbnd  35961  ac6s3f  36338  moxfr  40521  eldioph2b  40592  kelac1  40895  cbvexsv  42174  sprid  44937