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Theorem n0r 3521
Description: An inhabited class is nonempty. See n0rf 3520 for more discussion. (Contributed by Jim Kingdon, 31-Jul-2018.)
Assertion
Ref Expression
n0r (∃𝑥 𝑥𝐴𝐴 ≠ ∅)
Distinct variable group:   𝑥,𝐴

Proof of Theorem n0r
StepHypRef Expression
1 nfcv 2384 . 2 𝑥𝐴
21n0rf 3520 1 (∃𝑥 𝑥𝐴𝐴 ≠ ∅)
Colors of variables: wff set class
Syntax hints:  wi 4  wex 1541  wcel 2203  wne 2412  c0 3507
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2214
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-v 2814  df-dif 3212  df-nul 3508
This theorem is referenced by:  neq0r  3522  opnzi  4350  elqsn0  6837  fin0  7141  infn0  7164  fiubm  11188  lswex  11269  fsumcllem  12078  fprodcllem  12285  setsfun0  13237  gsumwsubmcl  13698  gsumwmhm  13700  g0wlk0  16352
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