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Theorem 2ssom 6797
Description: The ordinal 2 is included in the set of natural number ordinals. (Contributed by BJ, 5-Aug-2024.)
Assertion
Ref Expression
2ssom  |-  2o  C_  om

Proof of Theorem 2ssom
StepHypRef Expression
1 2onn 6794 . 2  |-  2o  e.  om
2 elomssom 4752 . 2  |-  ( 2o  e.  om  ->  2o  C_ 
om )
31, 2ax-mp 5 1  |-  2o  C_  om
Colors of variables:    wff set class
This proof depends on syntax axioms:    e. wcel 2209    C_ wss 3220   omcom 4737   2oc2o 6681
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-nul 4259  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-iinf 4735
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3690  df-sn 3715  df-pr 3716  df-uni 3936  df-int 3971  df-suc 4516  df-iom 4738  df-1o 6687  df-2o 6688
This theorem is used by:  2omap  7318  nninfwlporlemd  7512  nninfwlporlem  7513  nninfwlpoimlemg  7515  nninfwlpoimlemginf  7516  nninfctlemfo  12817  bj-charfunbi  16837
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