MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  orduni Structured version   Visualization version   GIF version

Theorem orduni 7771
Description: The union of an ordinal class is ordinal. (Contributed by NM, 12-Sep-2003.)
Assertion
Ref Expression
orduni (Ord 𝐴 → Ord 𝐴)

Proof of Theorem orduni
StepHypRef Expression
1 ordsson 7764 . 2 (Ord 𝐴𝐴 ⊆ On)
2 ssorduni 7760 . 2 (𝐴 ⊆ On → Ord 𝐴)
31, 2syl 17 1 (Ord 𝐴 → Ord 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wss 3941   cuni 4900  Ord word 6354  Oncon0 6355
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-ext 2695  ax-sep 5290  ax-nul 5297  ax-pr 5418
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3or 1085  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-sb 2060  df-clab 2702  df-cleq 2716  df-clel 2802  df-ne 2933  df-ral 3054  df-rex 3063  df-rab 3425  df-v 3468  df-dif 3944  df-un 3946  df-in 3948  df-ss 3958  df-pss 3960  df-nul 4316  df-if 4522  df-pw 4597  df-sn 4622  df-pr 4624  df-op 4628  df-uni 4901  df-br 5140  df-opab 5202  df-tr 5257  df-eprel 5571  df-po 5579  df-so 5580  df-fr 5622  df-we 5624  df-ord 6358  df-on 6359
This theorem is referenced by:  ordsucuniel  7806  orduniorsuc  7812  cantnflem1  9681  rankxplim3  9873  ordcmp  35833
  Copyright terms: Public domain W3C validator