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| Mirrors > Home > ILE Home > Th. List > pion | Unicode version | ||
| Description: A positive integer is an ordinal number. (Contributed by NM, 23-Mar-1996.) |
| Ref | Expression |
|---|---|
| pion |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pinn 7531 |
. 2
| |
| 2 | nnon 4707 |
. 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2203 ax-14 2204 ax-ext 2212 ax-sep 4206 ax-nul 4214 ax-pow 4263 ax-pr 4298 ax-un 4529 ax-iinf 4685 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1810 df-clab 2217 df-cleq 2223 df-clel 2226 df-nfc 2362 df-ral 2514 df-rex 2515 df-v 2803 df-dif 3201 df-un 3203 df-in 3205 df-ss 3212 df-nul 3494 df-pw 3653 df-sn 3674 df-pr 3675 df-uni 3893 df-int 3928 df-tr 4187 df-iord 4462 df-on 4464 df-suc 4467 df-iom 4688 df-ni 7526 |
| This theorem is referenced by: ltsopi 7542 indpi 7564 |
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