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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 8461 | . 2 ⊢ 0 < 1 | |
| 2 | nnnlt1 9340 | . 2 ⊢ (0 ∈ ℕ → ¬ 0 < 1) | |
| 3 | 1, 2 | mt2 649 | 1 ⊢ ¬ 0 ∈ ℕ |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ¬ wn 3 ∈ wcel 2209 class class class wbr 4131 0cc0 8186 1c1 8187 < clt 8367 ℕcn 9314 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-setind 4686 ax-cnex 8277 ax-resscn 8278 ax-1re 8280 ax-addrcl 8283 ax-0lt1 8292 ax-0id 8294 ax-rnegex 8295 ax-pre-ltirr 8298 ax-pre-lttrn 8300 ax-pre-ltadd 8302 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-br 4132 df-opab 4194 df-xp 4782 df-cnv 4784 df-iota 5340 df-fv 5388 df-ov 6091 df-pnf 8369 df-mnf 8370 df-xr 8371 df-ltxr 8372 df-le 8373 df-inn 9315 |
| This theorem is used by: nnne0 9342 dfn2 9588 nn0enne 12695 exprmfct 12943 coprm 12949 fczpsrbag 15171 |
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