| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 7523 | . . 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 7491 |
| 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 7523 |
| This theorem is referenced by: pion 7529 piord 7530 elni2 7533 mulidpi 7537 ltsopi 7539 pitric 7540 pitri3or 7541 ltdcpi 7542 addclpi 7546 mulclpi 7547 addcompig 7548 addasspig 7549 mulcompig 7550 mulasspig 7551 distrpig 7552 addcanpig 7553 mulcanpig 7554 addnidpig 7555 ltexpi 7556 ltapig 7557 ltmpig 7558 nnppipi 7562 enqdc 7580 archnqq 7636 prarloclemarch2 7638 enq0enq 7650 enq0sym 7651 enq0ref 7652 enq0tr 7653 nqnq0pi 7657 nqnq0 7660 addcmpblnq0 7662 mulcmpblnq0 7663 mulcanenq0ec 7664 addclnq0 7670 nqpnq0nq 7672 nqnq0a 7673 nqnq0m 7674 nq0m0r 7675 nq0a0 7676 nnanq0 7677 distrnq0 7678 mulcomnq0 7679 addassnq0lemcl 7680 addassnq0 7681 nq02m 7684 prarloclemlt 7712 prarloclemn 7718 |
| Copyright terms: Public domain | W3C validator |