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Related theorems GIF version |
| Description: A positive integer is ordinal. |
| Ref | Expression |
|---|---|
| piord | ⊢ (A ∈ N → Ord A) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pinn 3800 | . 2 ⊢ (A ∈ N → A ∈ ω) | |
| 2 | nnord 2381 | . 2 ⊢ (A ∈ ω → Ord A) | |
| 3 | 1, 2 | syl 12 | 1 ⊢ (A ∈ N → Ord A) |
| Colors of variables: wff set class |
| Syntax hints: → wi 2 ∈ wcel 1092 Ord word 2198 ωcom 2372 Ncnpi 3766 |
| This theorem is referenced by: ltsopi 3810 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-16 922 ax-17 925 ax-ext 1074 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-3an 583 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-ral 1205 df-rex 1206 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-sn 1811 df-pr 1812 df-op 1815 df-uni 1920 df-tr 2042 df-br 2063 df-po 2128 df-so 2138 df-fr 2169 df-we 2186 df-ord 2202 df-on 2203 df-om 2373 df-ni 3794 |