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| Mirrors > Home > ILE Home > Th. List > nnord | Unicode version | ||
| Description: A natural number is ordinal. (Contributed by NM, 17-Oct-1995.) |
| Ref | Expression |
|---|---|
| nnord |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnon 4732 |
. 2
| |
| 2 | eloni 4496 |
. 2
| |
| 3 | 1, 2 | syl 14 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-sep 4228 ax-nul 4236 ax-pow 4287 ax-pr 4322 ax-un 4554 ax-iinf 4710 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ral 2525 df-rex 2526 df-v 2815 df-dif 3213 df-un 3215 df-in 3217 df-ss 3224 df-nul 3509 df-pw 3671 df-sn 3695 df-pr 3696 df-uni 3915 df-int 3950 df-tr 4209 df-iord 4487 df-on 4489 df-suc 4492 df-iom 4713 |
| This theorem is referenced by: nnsucsssuc 6725 nnsucuniel 6728 nntri1 6729 nnsseleq 6734 nntr2 6736 phplem1 7106 phplem2 7107 phplem3 7108 phplem4 7109 phplem4dom 7116 nndomo 7118 1ndom2 7119 dif1en 7136 nnwetri 7176 unsnfi 7179 ctmlemr 7399 nnnninf 7417 nnnninfeq 7419 nnnninfeq2 7420 nninfisol 7424 piord 7626 addnidpig 7651 archnqq 7732 frecfzennn 10788 hashp1i 11175 ennnfonelemk 13151 ennnfonelemg 13154 ennnfonelemhf1o 13164 ennnfonelemhom 13166 ctinfom 13179 3dom 16762 nnsf 16783 peano4nninf 16784 nninfsellemeq 16792 nnnninfex 16800 |
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