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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 7567 | . . 3 ⊢ N = (ω ∖ {∅}) | |
| 2 | difss 3335 | . . 3 ⊢ (ω ∖ {∅}) ⊆ ω | |
| 3 | 1, 2 | eqsstri 3260 | . 2 ⊢ N ⊆ ω |
| 4 | 3 | sseli 3224 | 1 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2202 ∖ cdif 3198 ∅c0 3496 {csn 3673 ωcom 4694 Ncnpi 7535 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-v 2805 df-dif 3203 df-in 3207 df-ss 3214 df-ni 7567 |
| This theorem is referenced by: pion 7573 piord 7574 elni2 7577 mulidpi 7581 ltsopi 7583 pitric 7584 pitri3or 7585 ltdcpi 7586 addclpi 7590 mulclpi 7591 addcompig 7592 addasspig 7593 mulcompig 7594 mulasspig 7595 distrpig 7596 addcanpig 7597 mulcanpig 7598 addnidpig 7599 ltexpi 7600 ltapig 7601 ltmpig 7602 nnppipi 7606 enqdc 7624 archnqq 7680 prarloclemarch2 7682 enq0enq 7694 enq0sym 7695 enq0ref 7696 enq0tr 7697 nqnq0pi 7701 nqnq0 7704 addcmpblnq0 7706 mulcmpblnq0 7707 mulcanenq0ec 7708 addclnq0 7714 nqpnq0nq 7716 nqnq0a 7717 nqnq0m 7718 nq0m0r 7719 nq0a0 7720 nnanq0 7721 distrnq0 7722 mulcomnq0 7723 addassnq0lemcl 7724 addassnq0 7725 nq02m 7728 prarloclemlt 7756 prarloclemn 7762 |
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