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Theorem oneluni 4118
Description: An ordinal number equals its union with any element. (Contributed by NM, 13-Jun-1994.)
Hypothesis
Ref Expression
on.1  On
Assertion
Ref Expression
oneluni  u.

Proof of Theorem oneluni
StepHypRef Expression
1 on.1 . . 3  On
21onelssi 4116 . 2  C_
3 ssequn2 3093 . 2 
C_  u.
42, 3sylib 127 1  u.
Colors of variables: wff set class
Syntax hints:   wi 4   wceq 1228   wcel 1374    u. cun 2892    C_ wss 2894   Oncon0 4049
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 617  ax-5 1316  ax-7 1317  ax-gen 1318  ax-ie1 1363  ax-ie2 1364  ax-8 1376  ax-10 1377  ax-11 1378  ax-i12 1379  ax-bnd 1380  ax-4 1381  ax-17 1400  ax-i9 1404  ax-ial 1409  ax-i5r 1410  ax-ext 2004
This theorem depends on definitions:  df-bi 110  df-tru 1231  df-nf 1330  df-sb 1628  df-clab 2009  df-cleq 2015  df-clel 2018  df-nfc 2149  df-ral 2289  df-rex 2290  df-v 2537  df-un 2899  df-in 2901  df-ss 2908  df-uni 3555  df-tr 3829  df-iord 4052  df-on 4054
This theorem is referenced by: (None)
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