Theorem 2ssom 6772

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

Step	Hyp	Ref	Expression
1		2onn 6769	. 2 ⊢ 2o ∈ ω
2		elomssom 4734	. 2 ⊢ (2o ∈ ω → 2o ⊆ ω)
3	1, 2	ax-mp 5	1 ⊢ 2o ⊆ ω

Syntax hints:   ∈ wcel 2205   ⊆ wss 3214  ωcom 4719  2_oc2o 6656

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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2208  ax-ext 2216  ax-sep 4234  ax-nul 4242  ax-pow 4293  ax-pr 4328  ax-un 4560  ax-iinf 4717

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-pw 3677  df-sn 3701  df-pr 3702  df-uni 3921  df-int 3956  df-suc 4498  df-iom 4720  df-1o 6662  df-2o 6663

This theorem is referenced by:  2omap  7284  nninfwlporlemd  7478  nninfwlporlem  7479  nninfwlpoimlemg  7481  nninfwlpoimlemginf  7482  nninfctlemfo  12767  bj-charfunbi  16722