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Theorem 1n0 5187
Description: Ordinal one is not equal to ordinal zero.
Assertion
Ref Expression
1n0 |- 1o =/= (/)

Proof of Theorem 1n0
StepHypRef Expression
1 0ex 3446 . . 3 |- (/) e. _V
21snnz 3119 . 2 |- {(/)} =/= (/)
3 df1o2 5185 . . 3 |- 1o = {(/)}
43neeq1i 2026 . 2 |- (1o =/= (/) <-> {(/)} =/= (/))
52, 4mpbir 207 1 |- 1o =/= (/)
Colors of variables: wff set class
Syntax hints:   =/= wne 2017  (/)c0 2875  {csn 3044  1oc1o 5172
This theorem is referenced by:  xp01disj 5188  card1 5983  unxpdom2 5997  sucxpdom 5998  cdacomen 6079  1pi 6163  bnj107 12452  sltval2 13997  nosgnn0 13999  sltintdifex 14004  axsltsolem1 14006  axfelem12 14042
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 1304  ax-gen 1305  ax-8 1306  ax-9 1307  ax-10 1308  ax-11 1309  ax-12 1310  ax-17 1317  ax-4 1319  ax-5o 1321  ax-6o 1324  ax-9o 1481  ax-10o 1500  ax-16 1580  ax-11o 1588  ax-ext 1865  ax-nul 3445
This theorem depends on definitions:  df-bi 164  df-or 241  df-an 242  df-ex 1327  df-sb 1536  df-clab 1872  df-cleq 1877  df-clel 1880  df-ne 2019  df-v 2294  df-dif 2597  df-un 2600  df-nul 2876  df-sn 3049  df-suc 3663  df-1o 5177
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