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| Mirrors > Home > ILE Home > Th. List > Mathboxes > uzdcinzz | GIF version | ||
| Description: An upperset of integers is decidable in the integers. Reformulation of eluzdc 9989. (Contributed by Jim Kingdon, 18-Apr-2020.) (Revised by BJ, 19-Feb-2022.) |
| Ref | Expression |
|---|---|
| uzdcinzz | ⊢ (𝑀 ∈ ℤ → (ℤ≥‘𝑀) DECIDin ℤ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | zlelttric 9668 | . . . 4 ⊢ ((𝑀 ∈ ℤ ∧ 𝑥 ∈ ℤ) → (𝑀 ≤ 𝑥 ∨ 𝑥 < 𝑀)) | |
| 2 | eluz 9914 | . . . . . 6 ⊢ ((𝑀 ∈ ℤ ∧ 𝑥 ∈ ℤ) → (𝑥 ∈ (ℤ≥‘𝑀) ↔ 𝑀 ≤ 𝑥)) | |
| 3 | 2 | biimprd 158 | . . . . 5 ⊢ ((𝑀 ∈ ℤ ∧ 𝑥 ∈ ℤ) → (𝑀 ≤ 𝑥 → 𝑥 ∈ (ℤ≥‘𝑀))) |
| 4 | zltnle 9669 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝑥 < 𝑀 ↔ ¬ 𝑀 ≤ 𝑥)) | |
| 5 | 4 | ancoms 268 | . . . . . 6 ⊢ ((𝑀 ∈ ℤ ∧ 𝑥 ∈ ℤ) → (𝑥 < 𝑀 ↔ ¬ 𝑀 ≤ 𝑥)) |
| 6 | 2 | notbid 677 | . . . . . . 7 ⊢ ((𝑀 ∈ ℤ ∧ 𝑥 ∈ ℤ) → (¬ 𝑥 ∈ (ℤ≥‘𝑀) ↔ ¬ 𝑀 ≤ 𝑥)) |
| 7 | 6 | biimprd 158 | . . . . . 6 ⊢ ((𝑀 ∈ ℤ ∧ 𝑥 ∈ ℤ) → (¬ 𝑀 ≤ 𝑥 → ¬ 𝑥 ∈ (ℤ≥‘𝑀))) |
| 8 | 5, 7 | sylbid 150 | . . . . 5 ⊢ ((𝑀 ∈ ℤ ∧ 𝑥 ∈ ℤ) → (𝑥 < 𝑀 → ¬ 𝑥 ∈ (ℤ≥‘𝑀))) |
| 9 | 3, 8 | orim12d 798 | . . . 4 ⊢ ((𝑀 ∈ ℤ ∧ 𝑥 ∈ ℤ) → ((𝑀 ≤ 𝑥 ∨ 𝑥 < 𝑀) → (𝑥 ∈ (ℤ≥‘𝑀) ∨ ¬ 𝑥 ∈ (ℤ≥‘𝑀)))) |
| 10 | 1, 9 | mpd 13 | . . 3 ⊢ ((𝑀 ∈ ℤ ∧ 𝑥 ∈ ℤ) → (𝑥 ∈ (ℤ≥‘𝑀) ∨ ¬ 𝑥 ∈ (ℤ≥‘𝑀))) |
| 11 | 10 | ex 115 | . 2 ⊢ (𝑀 ∈ ℤ → (𝑥 ∈ ℤ → (𝑥 ∈ (ℤ≥‘𝑀) ∨ ¬ 𝑥 ∈ (ℤ≥‘𝑀)))) |
| 12 | 11 | decidr 16738 | 1 ⊢ (𝑀 ∈ ℤ → (ℤ≥‘𝑀) DECIDin ℤ) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ↔ wb 105 ∨ wo 720 ∈ wcel 2209 class class class wbr 4125 ‘cfv 5372 < clt 8350 ≤ cle 8351 ℤcz 9623 ℤ≥cuz 9900 DECIDin wdcin 16735 |
| 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 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 4244 ax-pow 4306 ax-pr 4341 ax-un 4573 ax-setind 4679 ax-cnex 8260 ax-resscn 8261 ax-1cn 8262 ax-1re 8263 ax-icn 8264 ax-addcl 8265 ax-addrcl 8266 ax-mulcl 8267 ax-addcom 8269 ax-addass 8271 ax-distr 8273 ax-i2m1 8274 ax-0lt1 8275 ax-0id 8277 ax-rnegex 8278 ax-cnre 8280 ax-pre-ltirr 8281 ax-pre-ltwlin 8282 ax-pre-lttrn 8283 ax-pre-ltadd 8285 |
| This theorem depends on definitions: df-bi 117 df-dc 847 df-3or 1010 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-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-int 3966 df-br 4126 df-opab 4188 df-mpt 4189 df-id 4433 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-iota 5332 df-fun 5374 df-fv 5380 df-riota 6028 df-ov 6078 df-oprab 6079 df-mpo 6080 df-pnf 8352 df-mnf 8353 df-xr 8354 df-ltxr 8355 df-le 8356 df-sub 8489 df-neg 8490 df-inn 9284 df-n0 9543 df-z 9624 df-uz 9901 df-dcin 16736 |
| This theorem is referenced by: sumdc2 16741 |
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