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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 6402 | . . 3 | |
2 | difss 3070 | . . 3 | |
3 | 1, 2 | eqsstri 2975 | . 2 |
4 | 3 | sseli 2941 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wcel 1393 cdif 2914 c0 3224 csn 3375 com 4313 cnpi 6370 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-in1 544 ax-in2 545 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 |
This theorem depends on definitions: df-bi 110 df-tru 1246 df-nf 1350 df-sb 1646 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-v 2559 df-dif 2920 df-in 2924 df-ss 2931 df-ni 6402 |
This theorem is referenced by: pion 6408 piord 6409 elni2 6412 mulidpi 6416 ltsopi 6418 pitric 6419 pitri3or 6420 ltdcpi 6421 addclpi 6425 mulclpi 6426 addcompig 6427 addasspig 6428 mulcompig 6429 mulasspig 6430 distrpig 6431 addcanpig 6432 mulcanpig 6433 addnidpig 6434 ltexpi 6435 ltapig 6436 ltmpig 6437 nnppipi 6441 enqdc 6459 archnqq 6515 prarloclemarch2 6517 enq0enq 6529 enq0sym 6530 enq0ref 6531 enq0tr 6532 nqnq0pi 6536 nqnq0 6539 addcmpblnq0 6541 mulcmpblnq0 6542 mulcanenq0ec 6543 addclnq0 6549 nqpnq0nq 6551 nqnq0a 6552 nqnq0m 6553 nq0m0r 6554 nq0a0 6555 nnanq0 6556 distrnq0 6557 mulcomnq0 6558 addassnq0lemcl 6559 addassnq0 6560 nq02m 6563 prarloclemlt 6591 prarloclemn 6597 |
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