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Theorem rex0 4082
Description: Vacuous existential quantification is false. (Contributed by NM, 15-Oct-2003.)
Assertion
Ref Expression
rex0 ¬ ∃𝑥 ∈ ∅ 𝜑

Proof of Theorem rex0
StepHypRef Expression
1 noel 4063 . . 3 ¬ 𝑥 ∈ ∅
21pm2.21i 116 . 2 (𝑥 ∈ ∅ → ¬ 𝜑)
32nrex 3139 1 ¬ ∃𝑥 ∈ ∅ 𝜑
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wcel 2140  wrex 3052  c0 4059
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1989  ax-6 2055  ax-7 2091  ax-9 2149  ax-10 2169  ax-11 2184  ax-12 2197  ax-13 2392  ax-ext 2741
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2048  df-clab 2748  df-cleq 2754  df-clel 2757  df-nfc 2892  df-ral 3056  df-rex 3057  df-v 3343  df-dif 3719  df-nul 4060
This theorem is referenced by:  0iun  4730  sup0riota  8539  cfeq0  9291  cfsuc  9292  hashge2el2difr  13476  cshws0  16031  meet0  17359  join0  17360  dya2iocuni  30676  eulerpartlemgh  30771  0qs  34474  pmapglb2xN  35580  elpadd0  35617  sprsymrelfvlem  42269
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