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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 7524 | . . 3 ⊢ N = (ω ∖ {∅}) | |
| 2 | difss 3333 | . . 3 ⊢ (ω ∖ {∅}) ⊆ ω | |
| 3 | 1, 2 | eqsstri 3259 | . 2 ⊢ N ⊆ ω |
| 4 | 3 | sseli 3223 | 1 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2202 ∖ cdif 3197 ∅c0 3494 {csn 3669 ωcom 4688 Ncnpi 7492 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-v 2804 df-dif 3202 df-in 3206 df-ss 3213 df-ni 7524 |
| This theorem is referenced by: pion 7530 piord 7531 elni2 7534 mulidpi 7538 ltsopi 7540 pitric 7541 pitri3or 7542 ltdcpi 7543 addclpi 7547 mulclpi 7548 addcompig 7549 addasspig 7550 mulcompig 7551 mulasspig 7552 distrpig 7553 addcanpig 7554 mulcanpig 7555 addnidpig 7556 ltexpi 7557 ltapig 7558 ltmpig 7559 nnppipi 7563 enqdc 7581 archnqq 7637 prarloclemarch2 7639 enq0enq 7651 enq0sym 7652 enq0ref 7653 enq0tr 7654 nqnq0pi 7658 nqnq0 7661 addcmpblnq0 7663 mulcmpblnq0 7664 mulcanenq0ec 7665 addclnq0 7671 nqpnq0nq 7673 nqnq0a 7674 nqnq0m 7675 nq0m0r 7676 nq0a0 7677 nnanq0 7678 distrnq0 7679 mulcomnq0 7680 addassnq0lemcl 7681 addassnq0 7682 nq02m 7685 prarloclemlt 7713 prarloclemn 7719 |
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