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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 4706 |
. 2
| |
| 2 | eloni 4470 |
. 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 4205 ax-nul 4213 ax-pow 4262 ax-pr 4297 ax-un 4528 ax-iinf 4684 |
| 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 2802 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-nul 3493 df-pw 3652 df-sn 3673 df-pr 3674 df-uni 3892 df-int 3927 df-tr 4186 df-iord 4461 df-on 4463 df-suc 4466 df-iom 4687 |
| This theorem is referenced by: nnsucsssuc 6655 nnsucuniel 6658 nntri1 6659 nnsseleq 6664 nntr2 6666 phplem1 7033 phplem2 7034 phplem3 7035 phplem4 7036 phplem4dom 7043 nndomo 7045 1ndom2 7046 dif1en 7061 nnwetri 7101 unsnfi 7104 ctmlemr 7298 nnnninf 7316 nnnninfeq 7318 nnnninfeq2 7319 nninfisol 7323 piord 7521 addnidpig 7546 archnqq 7627 frecfzennn 10678 hashp1i 11064 ennnfonelemk 13011 ennnfonelemg 13014 ennnfonelemhf1o 13024 ennnfonelemhom 13026 ctinfom 13039 3dom 16523 nnsf 16543 peano4nninf 16544 nninfsellemeq 16552 nnnninfex 16560 |
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