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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 4701 |
. 2
| |
| 2 | eloni 4465 |
. 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4201 ax-nul 4209 ax-pow 4257 ax-pr 4292 ax-un 4523 ax-iinf 4679 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-v 2801 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-pw 3651 df-sn 3672 df-pr 3673 df-uni 3888 df-int 3923 df-tr 4182 df-iord 4456 df-on 4458 df-suc 4461 df-iom 4682 |
| This theorem is referenced by: nnsucsssuc 6636 nnsucuniel 6639 nntri1 6640 nnsseleq 6645 nntr2 6647 phplem1 7009 phplem2 7010 phplem3 7011 phplem4 7012 phplem4dom 7019 nndomo 7021 1ndom2 7022 dif1en 7037 nnwetri 7074 unsnfi 7077 ctmlemr 7271 nnnninf 7289 nnnninfeq 7291 nnnninfeq2 7292 nninfisol 7296 piord 7494 addnidpig 7519 archnqq 7600 frecfzennn 10643 hashp1i 11027 ennnfonelemk 12966 ennnfonelemg 12969 ennnfonelemhf1o 12979 ennnfonelemhom 12981 ctinfom 12994 nnsf 16330 peano4nninf 16331 nninfsellemeq 16339 nnnninfex 16347 |
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