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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 7661 | . . 3 ⊢ N = (ω ∖ {∅}) | |
| 2 | difss 3355 | . . 3 ⊢ (ω ∖ {∅}) ⊆ ω | |
| 3 | 1, 2 | eqsstri 3280 | . 2 ⊢ N ⊆ ω |
| 4 | 3 | sseli 3244 | 1 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2209 ∖ cdif 3217 ∅c0 3520 {csn 3705 ωcom 4732 Ncnpi 7629 |
| 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 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This theorem depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-dif 3222 df-in 3226 df-ss 3233 df-ni 7661 |
| This theorem is referenced by: pion 7667 piord 7668 elni2 7671 mulidpi 7675 ltsopi 7677 pitric 7678 pitri3or 7679 ltdcpi 7680 addclpi 7684 mulclpi 7685 addcompig 7686 addasspig 7687 mulcompig 7688 mulasspig 7689 distrpig 7690 addcanpig 7691 mulcanpig 7692 addnidpig 7693 ltexpi 7694 ltapig 7695 ltmpig 7696 nnppipi 7700 enqdc 7718 archnqq 7774 prarloclemarch2 7776 enq0enq 7788 enq0sym 7789 enq0ref 7790 enq0tr 7791 nqnq0pi 7795 nqnq0 7798 addcmpblnq0 7800 mulcmpblnq0 7801 mulcanenq0ec 7802 addclnq0 7808 nqpnq0nq 7810 nqnq0a 7811 nqnq0m 7812 nq0m0r 7813 nq0a0 7814 nnanq0 7815 distrnq0 7816 mulcomnq0 7817 addassnq0lemcl 7818 addassnq0 7819 nq02m 7822 prarloclemlt 7850 prarloclemn 7856 |
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