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| Mirrors > Home > ILE Home > Th. List > 0nnn | GIF version | ||
| Description: Zero is not a positive integer. (Contributed by NM, 25-Aug-1999.) |
| Ref | Expression |
|---|---|
| 0nnn | ⊢ ¬ 0 ∈ ℕ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0lt1 8311 | . 2 ⊢ 0 < 1 | |
| 2 | nnnlt1 9174 | . 2 ⊢ (0 ∈ ℕ → ¬ 0 < 1) | |
| 3 | 1, 2 | mt2 645 | 1 ⊢ ¬ 0 ∈ ℕ |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 ∈ wcel 2201 class class class wbr 4089 0cc0 8037 1c1 8038 < clt 8219 ℕcn 9148 |
| 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-13 2203 ax-14 2204 ax-ext 2212 ax-sep 4208 ax-pow 4266 ax-pr 4301 ax-un 4532 ax-setind 4637 ax-cnex 8128 ax-resscn 8129 ax-1re 8131 ax-addrcl 8134 ax-0lt1 8143 ax-0id 8145 ax-rnegex 8146 ax-pre-ltirr 8149 ax-pre-lttrn 8151 ax-pre-ltadd 8153 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1810 df-eu 2081 df-mo 2082 df-clab 2217 df-cleq 2223 df-clel 2226 df-nfc 2362 df-ne 2402 df-nel 2497 df-ral 2514 df-rex 2515 df-rab 2518 df-v 2803 df-dif 3201 df-un 3203 df-in 3205 df-ss 3212 df-pw 3655 df-sn 3676 df-pr 3677 df-op 3679 df-uni 3895 df-int 3930 df-br 4090 df-opab 4152 df-xp 4733 df-cnv 4735 df-iota 5288 df-fv 5336 df-ov 6026 df-pnf 8221 df-mnf 8222 df-xr 8223 df-ltxr 8224 df-le 8225 df-inn 9149 |
| This theorem is referenced by: nnne0 9176 dfn2 9420 nn0enne 12486 exprmfct 12733 coprm 12739 fczpsrbag 14709 |
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