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| Mirrors > Home > ILE Home > Th. List > znnnlt1 | GIF version | ||
| Description: An integer is not a positive integer iff it is less than one. (Contributed by NM, 13-Jul-2005.) |
| Ref | Expression |
|---|---|
| znnnlt1 | ⊢ (𝑁 ∈ ℤ → (¬ 𝑁 ∈ ℕ ↔ 𝑁 < 1)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elnnz1 9480 | . . . 4 ⊢ (𝑁 ∈ ℕ ↔ (𝑁 ∈ ℤ ∧ 1 ≤ 𝑁)) | |
| 2 | 1 | baib 924 | . . 3 ⊢ (𝑁 ∈ ℤ → (𝑁 ∈ ℕ ↔ 1 ≤ 𝑁)) |
| 3 | 2 | notbid 671 | . 2 ⊢ (𝑁 ∈ ℤ → (¬ 𝑁 ∈ ℕ ↔ ¬ 1 ≤ 𝑁)) |
| 4 | 1z 9483 | . . 3 ⊢ 1 ∈ ℤ | |
| 5 | zltnle 9503 | . . 3 ⊢ ((𝑁 ∈ ℤ ∧ 1 ∈ ℤ) → (𝑁 < 1 ↔ ¬ 1 ≤ 𝑁)) | |
| 6 | 4, 5 | mpan2 425 | . 2 ⊢ (𝑁 ∈ ℤ → (𝑁 < 1 ↔ ¬ 1 ≤ 𝑁)) |
| 7 | 3, 6 | bitr4d 191 | 1 ⊢ (𝑁 ∈ ℤ → (¬ 𝑁 ∈ ℕ ↔ 𝑁 < 1)) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 105 ∈ wcel 2200 class class class wbr 4083 1c1 8011 < clt 8192 ≤ cle 8193 ℕcn 9121 ℤcz 9457 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-pow 4258 ax-pr 4293 ax-un 4524 ax-setind 4629 ax-cnex 8101 ax-resscn 8102 ax-1cn 8103 ax-1re 8104 ax-icn 8105 ax-addcl 8106 ax-addrcl 8107 ax-mulcl 8108 ax-addcom 8110 ax-addass 8112 ax-distr 8114 ax-i2m1 8115 ax-0lt1 8116 ax-0id 8118 ax-rnegex 8119 ax-cnre 8121 ax-pre-ltirr 8122 ax-pre-ltwlin 8123 ax-pre-lttrn 8124 ax-pre-ltadd 8126 |
| This theorem depends on definitions: df-bi 117 df-3or 1003 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rab 2517 df-v 2801 df-sbc 3029 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-int 3924 df-br 4084 df-opab 4146 df-id 4384 df-xp 4725 df-rel 4726 df-cnv 4727 df-co 4728 df-dm 4729 df-iota 5278 df-fun 5320 df-fv 5326 df-riota 5960 df-ov 6010 df-oprab 6011 df-mpo 6012 df-pnf 8194 df-mnf 8195 df-xr 8196 df-ltxr 8197 df-le 8198 df-sub 8330 df-neg 8331 df-inn 9122 df-n0 9381 df-z 9458 |
| This theorem is referenced by: (None) |
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