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Theorem 2ssom 6542
Description: The ordinal 2 is included in the set of natural number ordinals. (Contributed by BJ, 5-Aug-2024.)
Assertion
Ref Expression
2ssom 2o ⊆ ω

Proof of Theorem 2ssom
StepHypRef Expression
1 2onn 6539 . 2 2o ∈ ω
2 elomssom 4618 . 2 (2o ∈ ω → 2o ⊆ ω)
31, 2ax-mp 5 1 2o ⊆ ω
Colors of variables: wff set class
Syntax hints:  wcel 2159  wss 3143  ωcom 4603  2oc2o 6428
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 710  ax-5 1457  ax-7 1458  ax-gen 1459  ax-ie1 1503  ax-ie2 1504  ax-8 1514  ax-10 1515  ax-11 1516  ax-i12 1517  ax-bndl 1519  ax-4 1520  ax-17 1536  ax-i9 1540  ax-ial 1544  ax-i5r 1545  ax-13 2161  ax-14 2162  ax-ext 2170  ax-sep 4135  ax-nul 4143  ax-pow 4188  ax-pr 4223  ax-un 4447  ax-iinf 4601
This theorem depends on definitions:  df-bi 117  df-3an 981  df-tru 1366  df-nf 1471  df-sb 1773  df-clab 2175  df-cleq 2181  df-clel 2184  df-nfc 2320  df-ral 2472  df-rex 2473  df-v 2753  df-dif 3145  df-un 3147  df-in 3149  df-ss 3156  df-nul 3437  df-pw 3591  df-sn 3612  df-pr 3613  df-uni 3824  df-int 3859  df-suc 4385  df-iom 4604  df-1o 6434  df-2o 6435
This theorem is referenced by:  nninfwlporlemd  7187  nninfwlporlem  7188  nninfwlpoimlemg  7190  nninfwlpoimlemginf  7191  bj-charfunbi  14946
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