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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 7677 | . . 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 |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2209 ∖ cdif 3217 ∅c0 3520 {csn 3709 ωcom 4739 Ncnpi 7645 |
| This proof depends on 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 proof 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 7677 |
| This theorem is used by: pion 7683 piord 7684 elni2 7687 mulidpi 7691 ltsopi 7693 pitric 7694 pitri3or 7695 ltdcpi 7696 addclpi 7700 mulclpi 7701 addcompig 7702 addasspig 7703 mulcompig 7704 mulasspig 7705 distrpig 7706 addcanpig 7707 mulcanpig 7708 addnidpig 7709 ltexpi 7710 ltapig 7711 ltmpig 7712 nnppipi 7716 enqdc 7734 archnqq 7790 prarloclemarch2 7792 enq0enq 7804 enq0sym 7805 enq0ref 7806 enq0tr 7807 nqnq0pi 7811 nqnq0 7814 addcmpblnq0 7816 mulcmpblnq0 7817 mulcanenq0ec 7818 addclnq0 7824 nqpnq0nq 7826 nqnq0a 7827 nqnq0m 7828 nq0m0r 7829 nq0a0 7830 nnanq0 7831 distrnq0 7832 mulcomnq0 7833 addassnq0lemcl 7834 addassnq0 7835 nq02m 7838 prarloclemlt 7866 prarloclemn 7872 |
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