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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 7528 | . 2 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) | |
| 2 | nnord 4710 | . 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 2202 Ord word 4459 ωcom 4688 Ncnpi 7491 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-nul 4215 ax-pow 4264 ax-pr 4299 ax-un 4530 ax-iinf 4686 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-rex 2516 df-v 2804 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-nul 3495 df-pw 3654 df-sn 3675 df-pr 3676 df-uni 3894 df-int 3929 df-tr 4188 df-iord 4463 df-on 4465 df-suc 4468 df-iom 4689 df-ni 7523 |
| This theorem is referenced by: prarloclemn 7718 |
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