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| Mirrors > Home > ILE Home > Th. List > nnord | GIF version | ||
| Description: A natural number is ordinal. (Contributed by NM, 17-Oct-1995.) |
| Ref | Expression |
|---|---|
| nnord | ⊢ (𝐴 ∈ ω → Ord 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnon 4708 | . 2 ⊢ (𝐴 ∈ ω → 𝐴 ∈ On) | |
| 2 | eloni 4472 | . 2 ⊢ (𝐴 ∈ On → Ord 𝐴) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝐴 ∈ ω → Ord 𝐴) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2202 Ord word 4459 Oncon0 4460 ωcom 4688 |
| 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 |
| This theorem is referenced by: nnsucsssuc 6660 nnsucuniel 6663 nntri1 6664 nnsseleq 6669 nntr2 6671 phplem1 7038 phplem2 7039 phplem3 7040 phplem4 7041 phplem4dom 7048 nndomo 7050 1ndom2 7051 dif1en 7068 nnwetri 7108 unsnfi 7111 ctmlemr 7307 nnnninf 7325 nnnninfeq 7327 nnnninfeq2 7328 nninfisol 7332 piord 7531 addnidpig 7556 archnqq 7637 frecfzennn 10689 hashp1i 11075 ennnfonelemk 13039 ennnfonelemg 13042 ennnfonelemhf1o 13052 ennnfonelemhom 13054 ctinfom 13067 3dom 16638 nnsf 16658 peano4nninf 16659 nninfsellemeq 16667 nnnninfex 16675 |
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