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| Description: A natural number is ordinal. (Contributed by NM, 17-Oct-1995.) |
| Ref | Expression |
|---|---|
| nnord |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnon 4759 |
. 2
| |
| 2 | eloni 4522 |
. 2
| |
| 3 | 1, 2 | syl 14 |
1
|
| Colors of variables: wff set class |
| This proof depends on syntax axioms:
|
| This proof depends on 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 4251 ax-nul 4261 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-iinf 4737 |
| This proof 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 3690 df-sn 3715 df-pr 3716 df-uni 3936 df-int 3971 df-tr 4232 df-iord 4513 df-on 4515 df-suc 4518 df-iom 4740 |
| This theorem is used by: nnsucsssuc 6770 nnsucuniel 6773 nntri1 6774 nnsseleq 6779 nntr2 6781 phplem1 7159 phplem2 7160 phplem3 7161 phplem4 7162 phplem4dom 7169 nndomo 7171 1ndom2 7172 dif1en 7189 nnwetri 7229 unsnfi 7232 ctmlemr 7454 nnnninf 7472 nnnninfeq 7474 nnnninfeq2 7475 nninfisol 7479 piord 7684 addnidpig 7709 archnqq 7790 frecfzennn 10883 hashp1i 11272 ennnfonelemk 13348 ennnfonelemg 13351 ennnfonelemhf1o 13361 ennnfonelemhom 13363 ctinfom 13376 3dom 17240 nnsf 17271 peano4nninf 17272 nninfsellemeq 17280 nnnninfex 17288 |
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