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Theorem orduniss 4977
Description: An ordinal class includes its union. (Contributed by NM, 13-Sep-2003.)
Assertion
Ref Expression
orduniss

Proof of Theorem orduniss
StepHypRef Expression
1 ordtr 4897 . 2
2 df-tr 4546 . 2
31, 2sylib 196 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  C_wss 3475  U.cuni 4249  Trwtr 4545  Ordword 4882
This theorem is referenced by:  orduniorsuc  6665  onfununi  7031  rankuniss  8305  r1limwun  9135  ontgval  29896
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 185  df-an 371  df-tr 4546  df-ord 4886
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