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Theorem 0nep0 4006
Description: The empty set and its power set are not equal. (Contributed by NM, 23-Dec-1993.)
Assertion
Ref Expression
0nep0 ∅ ≠ {∅}

Proof of Theorem 0nep0
StepHypRef Expression
1 0ex 3972 . . 3 ∅ ∈ V
21snnz 3565 . 2 {∅} ≠ ∅
32necomi 2341 1 ∅ ≠ {∅}
Colors of variables: wff set class
Syntax hints:  wne 2256  c0 3287  {csn 3450
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 580  ax-in2 581  ax-io 666  ax-5 1382  ax-7 1383  ax-gen 1384  ax-ie1 1428  ax-ie2 1429  ax-8 1441  ax-10 1442  ax-11 1443  ax-i12 1444  ax-bndl 1445  ax-4 1446  ax-17 1465  ax-i9 1469  ax-ial 1473  ax-i5r 1474  ax-ext 2071  ax-nul 3971
This theorem depends on definitions:  df-bi 116  df-tru 1293  df-nf 1396  df-sb 1694  df-clab 2076  df-cleq 2082  df-clel 2085  df-nfc 2218  df-ne 2257  df-v 2622  df-dif 3002  df-nul 3288  df-sn 3456
This theorem is referenced by:  0inp0  4007  opthprc  4502  2dom  6576  exmidpw  6678  pw1dom2  12162
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