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Theorem onuni 6628
Description: The union of an ordinal number is an ordinal number. (Contributed by NM, 29-Sep-2006.)
Assertion
Ref Expression
onuni

Proof of Theorem onuni
StepHypRef Expression
1 onss 6626 . 2
2 ssonuni 6622 . 2
31, 2mpd 15 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  e.wcel 1818  C_wss 3475  U.cuni 4249   con0 4883
This theorem is referenced by:  onuninsuci  6675  oeeulem  7269  cnfcom3lem  8168  cnfcom3lemOLD  8176  rankxpsuc  8321  dfac12lem2  8545  ttukeylem3  8912  r1limwun  9135  ontgval  29896  ordtoplem  29900  ordcmp  29912  aomclem1  31000
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747  ax-7 1790  ax-8 1820  ax-9 1822  ax-10 1837  ax-11 1842  ax-12 1854  ax-13 1999  ax-ext 2435  ax-sep 4573  ax-nul 4581  ax-pr 4691  ax-un 6592
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3or 974  df-3an 975  df-tru 1398  df-ex 1613  df-nf 1617  df-sb 1740  df-eu 2286  df-mo 2287  df-clab 2443  df-cleq 2449  df-clel 2452  df-nfc 2607  df-ne 2654  df-ral 2812  df-rex 2813  df-rab 2816  df-v 3111  df-sbc 3328  df-dif 3478  df-un 3480  df-in 3482  df-ss 3489  df-pss 3491  df-nul 3785  df-if 3942  df-sn 4030  df-pr 4032  df-tp 4034  df-op 4036  df-uni 4250  df-br 4453  df-opab 4511  df-tr 4546  df-eprel 4796  df-po 4805  df-so 4806  df-fr 4843  df-we 4845  df-ord 4886  df-on 4887
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