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Theorem 2ssom 13684
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 6489 . 2  |-  2o  e.  om
2 elomssom 4582 . 2  |-  ( 2o  e.  om  ->  2o  C_ 
om )
31, 2ax-mp 5 1  |-  2o  C_  om
Colors of variables: wff set class
Syntax hints:    e. wcel 2136    C_ wss 3116   omcom 4567   2oc2o 6378
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-sep 4100  ax-nul 4108  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-iinf 4565
This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-nf 1449  df-sb 1751  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ral 2449  df-rex 2450  df-v 2728  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-nul 3410  df-pw 3561  df-sn 3582  df-pr 3583  df-uni 3790  df-int 3825  df-suc 4349  df-iom 4568  df-1o 6384  df-2o 6385
This theorem is referenced by:  bj-charfunbi  13693
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