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| Mirrors > Home > ILE Home > Th. List > 2ssom | GIF version | ||
| Description: The ordinal 2 is included in the set of natural number ordinals. (Contributed by BJ, 5-Aug-2024.) |
| Ref | Expression |
|---|---|
| 2ssom | ⊢ 2o ⊆ ω |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2onn 6684 | . 2 ⊢ 2o ∈ ω | |
| 2 | elomssom 4701 | . 2 ⊢ (2o ∈ ω → 2o ⊆ ω) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ 2o ⊆ ω |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2200 ⊆ wss 3198 ωcom 4686 2oc2o 6571 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4205 ax-nul 4213 ax-pow 4262 ax-pr 4297 ax-un 4528 ax-iinf 4684 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-v 2802 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-nul 3493 df-pw 3652 df-sn 3673 df-pr 3674 df-uni 3892 df-int 3927 df-suc 4466 df-iom 4687 df-1o 6577 df-2o 6578 |
| This theorem is referenced by: nninfwlporlemd 7362 nninfwlporlem 7363 nninfwlpoimlemg 7365 nninfwlpoimlemginf 7366 nninfctlemfo 12601 bj-charfunbi 16342 2omap 16530 |
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