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| Mirrors > Home > ILE Home > Th. List > pinn | GIF version | ||
| Description: A positive integer is a natural number. (Contributed by NM, 15-Aug-1995.) |
| Ref | Expression |
|---|---|
| pinn | ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-ni 7514 | . . 3 ⊢ N = (ω ∖ {∅}) | |
| 2 | difss 3331 | . . 3 ⊢ (ω ∖ {∅}) ⊆ ω | |
| 3 | 1, 2 | eqsstri 3257 | . 2 ⊢ N ⊆ ω |
| 4 | 3 | sseli 3221 | 1 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2200 ∖ cdif 3195 ∅c0 3492 {csn 3667 ωcom 4686 Ncnpi 7482 |
| 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-ext 2211 |
| This theorem depends on definitions: df-bi 117 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-v 2802 df-dif 3200 df-in 3204 df-ss 3211 df-ni 7514 |
| This theorem is referenced by: pion 7520 piord 7521 elni2 7524 mulidpi 7528 ltsopi 7530 pitric 7531 pitri3or 7532 ltdcpi 7533 addclpi 7537 mulclpi 7538 addcompig 7539 addasspig 7540 mulcompig 7541 mulasspig 7542 distrpig 7543 addcanpig 7544 mulcanpig 7545 addnidpig 7546 ltexpi 7547 ltapig 7548 ltmpig 7549 nnppipi 7553 enqdc 7571 archnqq 7627 prarloclemarch2 7629 enq0enq 7641 enq0sym 7642 enq0ref 7643 enq0tr 7644 nqnq0pi 7648 nqnq0 7651 addcmpblnq0 7653 mulcmpblnq0 7654 mulcanenq0ec 7655 addclnq0 7661 nqpnq0nq 7663 nqnq0a 7664 nqnq0m 7665 nq0m0r 7666 nq0a0 7667 nnanq0 7668 distrnq0 7669 mulcomnq0 7670 addassnq0lemcl 7671 addassnq0 7672 nq02m 7675 prarloclemlt 7703 prarloclemn 7709 |
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