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Theorem 0cex 4393
Description: Cardinal zero is a set. (Contributed by SF, 14-Jan-2015.)
Assertion
Ref Expression
0cex 0c

Proof of Theorem 0cex
StepHypRef Expression
1 df-0c 4378 . 2 0c
2 snex 4112 . 2
31, 2eqeltri 2423 1 0c
Colors of variables: wff setvar class
Syntax hints:   wcel 1710  cvv 2860  c0 3551  csn 3738  0cc0c 4375
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4079  ax-sn 4088
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2479  df-ne 2519  df-v 2862  df-nin 3212  df-compl 3213  df-in 3214  df-un 3215  df-dif 3216  df-ss 3260  df-nul 3552  df-sn 3742  df-0c 4378
This theorem is referenced by:  peano1  4403  findsd  4411  ltfintri  4467  0ceven  4506  0cnelphi  4598  proj1op  4601  proj2op  4602  dfnnc3  5886  ce0nn  6181  lec0cg  6199  frecxp  6315  dmfrec  6317  fnfreclem2  6319  fnfreclem3  6320
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