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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 4752 | . 2 ⊢ (𝐴 ∈ ω → 𝐴 ∈ On) | |
| 2 | eloni 4515 | . 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 2209 Ord word 4502 Oncon0 4503 ωcom 4732 |
| 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 |
| This theorem is referenced by: nnsucsssuc 6755 nnsucuniel 6758 nntri1 6759 nnsseleq 6764 nntr2 6766 phplem1 7143 phplem2 7144 phplem3 7145 phplem4 7146 phplem4dom 7153 nndomo 7155 1ndom2 7156 dif1en 7173 nnwetri 7213 unsnfi 7216 ctmlemr 7438 nnnninf 7456 nnnninfeq 7458 nnnninfeq2 7459 nninfisol 7463 piord 7668 addnidpig 7693 archnqq 7774 frecfzennn 10841 hashp1i 11229 ennnfonelemk 13269 ennnfonelemg 13272 ennnfonelemhf1o 13282 ennnfonelemhom 13284 ctinfom 13297 3dom 16932 nnsf 16953 peano4nninf 16954 nninfsellemeq 16962 nnnninfex 16970 |
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