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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 7502 | . . 3 ⊢ N = (ω ∖ {∅}) | |
| 2 | difss 3330 | . . 3 ⊢ (ω ∖ {∅}) ⊆ ω | |
| 3 | 1, 2 | eqsstri 3256 | . 2 ⊢ N ⊆ ω |
| 4 | 3 | sseli 3220 | 1 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2200 ∖ cdif 3194 ∅c0 3491 {csn 3666 ωcom 4682 Ncnpi 7470 |
| 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 2801 df-dif 3199 df-in 3203 df-ss 3210 df-ni 7502 |
| This theorem is referenced by: pion 7508 piord 7509 elni2 7512 mulidpi 7516 ltsopi 7518 pitric 7519 pitri3or 7520 ltdcpi 7521 addclpi 7525 mulclpi 7526 addcompig 7527 addasspig 7528 mulcompig 7529 mulasspig 7530 distrpig 7531 addcanpig 7532 mulcanpig 7533 addnidpig 7534 ltexpi 7535 ltapig 7536 ltmpig 7537 nnppipi 7541 enqdc 7559 archnqq 7615 prarloclemarch2 7617 enq0enq 7629 enq0sym 7630 enq0ref 7631 enq0tr 7632 nqnq0pi 7636 nqnq0 7639 addcmpblnq0 7641 mulcmpblnq0 7642 mulcanenq0ec 7643 addclnq0 7649 nqpnq0nq 7651 nqnq0a 7652 nqnq0m 7653 nq0m0r 7654 nq0a0 7655 nnanq0 7656 distrnq0 7657 mulcomnq0 7658 addassnq0lemcl 7659 addassnq0 7660 nq02m 7663 prarloclemlt 7691 prarloclemn 7697 |
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