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| Mirrors > Home > ILE Home > Th. List > piord | GIF version | ||
| Description: A positive integer is ordinal. (Contributed by NM, 29-Jan-1996.) |
| Ref | Expression |
|---|---|
| piord | ⊢ (𝐴 ∈ N → Ord 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pinn 7666 | . 2 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) | |
| 2 | nnord 4754 | . 2 ⊢ (𝐴 ∈ ω → Ord 𝐴) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝐴 ∈ N → Ord 𝐴) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2209 Ord word 4502 ωcom 4732 Ncnpi 7629 |
| 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 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 4244 ax-nul 4254 ax-pow 4306 ax-pr 4341 ax-un 4573 ax-iinf 4730 |
| This theorem 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 3687 df-sn 3711 df-pr 3712 df-uni 3931 df-int 3966 df-tr 4225 df-iord 4506 df-on 4508 df-suc 4511 df-iom 4733 df-ni 7661 |
| This theorem is referenced by: prarloclemn 7856 |
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