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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 7298 | . . 3 ⊢ N = (ω ∖ {∅}) | |
2 | difss 3261 | . . 3 ⊢ (ω ∖ {∅}) ⊆ ω | |
3 | 1, 2 | eqsstri 3187 | . 2 ⊢ N ⊆ ω |
4 | 3 | sseli 3151 | 1 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 2148 ∖ cdif 3126 ∅c0 3422 {csn 3592 ωcom 4587 Ncnpi 7266 |
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 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-ext 2159 |
This theorem depends on definitions: df-bi 117 df-tru 1356 df-nf 1461 df-sb 1763 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-v 2739 df-dif 3131 df-in 3135 df-ss 3142 df-ni 7298 |
This theorem is referenced by: pion 7304 piord 7305 elni2 7308 mulidpi 7312 ltsopi 7314 pitric 7315 pitri3or 7316 ltdcpi 7317 addclpi 7321 mulclpi 7322 addcompig 7323 addasspig 7324 mulcompig 7325 mulasspig 7326 distrpig 7327 addcanpig 7328 mulcanpig 7329 addnidpig 7330 ltexpi 7331 ltapig 7332 ltmpig 7333 nnppipi 7337 enqdc 7355 archnqq 7411 prarloclemarch2 7413 enq0enq 7425 enq0sym 7426 enq0ref 7427 enq0tr 7428 nqnq0pi 7432 nqnq0 7435 addcmpblnq0 7437 mulcmpblnq0 7438 mulcanenq0ec 7439 addclnq0 7445 nqpnq0nq 7447 nqnq0a 7448 nqnq0m 7449 nq0m0r 7450 nq0a0 7451 nnanq0 7452 distrnq0 7453 mulcomnq0 7454 addassnq0lemcl 7455 addassnq0 7456 nq02m 7459 prarloclemlt 7487 prarloclemn 7493 |
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