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Mirrors > Home > ILE Home > Th. List > pinn | Unicode version |
Description: A positive integer is a natural number. (Contributed by NM, 15-Aug-1995.) |
Ref | Expression |
---|---|
pinn |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ni 6494 | . . 3 | |
2 | difss 3098 | . . 3 | |
3 | 1, 2 | eqsstri 3029 | . 2 |
4 | 3 | sseli 2995 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wcel 1433 cdif 2970 c0 3251 csn 3398 com 4331 cnpi 6462 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-tru 1287 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-v 2603 df-dif 2975 df-in 2979 df-ss 2986 df-ni 6494 |
This theorem is referenced by: pion 6500 piord 6501 elni2 6504 mulidpi 6508 ltsopi 6510 pitric 6511 pitri3or 6512 ltdcpi 6513 addclpi 6517 mulclpi 6518 addcompig 6519 addasspig 6520 mulcompig 6521 mulasspig 6522 distrpig 6523 addcanpig 6524 mulcanpig 6525 addnidpig 6526 ltexpi 6527 ltapig 6528 ltmpig 6529 nnppipi 6533 enqdc 6551 archnqq 6607 prarloclemarch2 6609 enq0enq 6621 enq0sym 6622 enq0ref 6623 enq0tr 6624 nqnq0pi 6628 nqnq0 6631 addcmpblnq0 6633 mulcmpblnq0 6634 mulcanenq0ec 6635 addclnq0 6641 nqpnq0nq 6643 nqnq0a 6644 nqnq0m 6645 nq0m0r 6646 nq0a0 6647 nnanq0 6648 distrnq0 6649 mulcomnq0 6650 addassnq0lemcl 6651 addassnq0 6652 nq02m 6655 prarloclemlt 6683 prarloclemn 6689 |
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