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Theorem 3on 6489
Description: Ordinal 3 is an ordinal number. (Contributed by Mario Carneiro, 5-Jan-2016.)
Assertion
Ref Expression
3on  |-  3o  e.  On

Proof of Theorem 3on
StepHypRef Expression
1 df-3o 6481 . 2  |-  3o  =  suc  2o
2 2on 6487 . . 3  |-  2o  e.  On
32onsuci 4629 . 2  |-  suc  2o  e.  On
41, 3eqeltri 2353 1  |-  3o  e.  On
Colors of variables: wff set class
Syntax hints:    e. wcel 1684   Oncon0 4392   suc csuc 4394   2oc2o 6473   3oc3o 6474
This theorem is referenced by:  4on  6490
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pr 4214  ax-un 4512
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-ral 2548  df-rex 2549  df-rab 2552  df-v 2790  df-sbc 2992  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-pss 3168  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-tp 3648  df-op 3649  df-uni 3828  df-br 4024  df-opab 4078  df-tr 4114  df-eprel 4305  df-po 4314  df-so 4315  df-fr 4352  df-we 4354  df-ord 4395  df-on 4396  df-suc 4398  df-1o 6479  df-2o 6480  df-3o 6481
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