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| Mirrors > Home > ILE Home > Th. List > zdvdsdc | GIF version | ||
| Description: Divisibility of integers is decidable. (Contributed by Jim Kingdon, 17-Jan-2022.) |
| Ref | Expression |
|---|---|
| zdvdsdc | ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID 𝑀 ∥ 𝑁) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpll 531 | . . . . . 6 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → 𝑀 ∈ ℤ) | |
| 2 | 1 | znegcld 9753 | . . . . 5 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → -𝑀 ∈ ℤ) |
| 3 | simpr 110 | . . . . . 6 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → 𝑀 < 0) | |
| 4 | 1 | zred 9751 | . . . . . . 7 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → 𝑀 ∈ ℝ) |
| 5 | 4 | lt0neg1d 8837 | . . . . . 6 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → (𝑀 < 0 ↔ 0 < -𝑀)) |
| 6 | 3, 5 | mpbid 147 | . . . . 5 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → 0 < -𝑀) |
| 7 | elnnz 9637 | . . . . 5 ⊢ (-𝑀 ∈ ℕ ↔ (-𝑀 ∈ ℤ ∧ 0 < -𝑀)) | |
| 8 | 2, 6, 7 | sylanbrc 421 | . . . 4 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → -𝑀 ∈ ℕ) |
| 9 | simplr 533 | . . . 4 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → 𝑁 ∈ ℤ) | |
| 10 | dvdsdc 12548 | . . . 4 ⊢ ((-𝑀 ∈ ℕ ∧ 𝑁 ∈ ℤ) → DECID -𝑀 ∥ 𝑁) | |
| 11 | 8, 9, 10 | syl2anc 415 | . . 3 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → DECID -𝑀 ∥ 𝑁) |
| 12 | negdvdsb 12557 | . . . . 5 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ∥ 𝑁 ↔ -𝑀 ∥ 𝑁)) | |
| 13 | 12 | adantr 276 | . . . 4 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → (𝑀 ∥ 𝑁 ↔ -𝑀 ∥ 𝑁)) |
| 14 | 13 | dcbid 850 | . . 3 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → (DECID 𝑀 ∥ 𝑁 ↔ DECID -𝑀 ∥ 𝑁)) |
| 15 | 11, 14 | mpbird 167 | . 2 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → DECID 𝑀 ∥ 𝑁) |
| 16 | 0z 9638 | . . . . 5 ⊢ 0 ∈ ℤ | |
| 17 | zdceq 9703 | . . . . 5 ⊢ ((𝑁 ∈ ℤ ∧ 0 ∈ ℤ) → DECID 𝑁 = 0) | |
| 18 | 16, 17 | mpan2 429 | . . . 4 ⊢ (𝑁 ∈ ℤ → DECID 𝑁 = 0) |
| 19 | 18 | ad2antlr 493 | . . 3 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 = 0) → DECID 𝑁 = 0) |
| 20 | breq1 4131 | . . . . . 6 ⊢ (𝑀 = 0 → (𝑀 ∥ 𝑁 ↔ 0 ∥ 𝑁)) | |
| 21 | 20 | adantl 277 | . . . . 5 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 = 0) → (𝑀 ∥ 𝑁 ↔ 0 ∥ 𝑁)) |
| 22 | 0dvds 12561 | . . . . . 6 ⊢ (𝑁 ∈ ℤ → (0 ∥ 𝑁 ↔ 𝑁 = 0)) | |
| 23 | 22 | ad2antlr 493 | . . . . 5 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 = 0) → (0 ∥ 𝑁 ↔ 𝑁 = 0)) |
| 24 | 21, 23 | bitrd 188 | . . . 4 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 = 0) → (𝑀 ∥ 𝑁 ↔ 𝑁 = 0)) |
| 25 | 24 | dcbid 850 | . . 3 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 = 0) → (DECID 𝑀 ∥ 𝑁 ↔ DECID 𝑁 = 0)) |
| 26 | 19, 25 | mpbird 167 | . 2 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 = 0) → DECID 𝑀 ∥ 𝑁) |
| 27 | simpll 531 | . . . 4 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 0 < 𝑀) → 𝑀 ∈ ℤ) | |
| 28 | simpr 110 | . . . 4 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 0 < 𝑀) → 0 < 𝑀) | |
| 29 | elnnz 9637 | . . . 4 ⊢ (𝑀 ∈ ℕ ↔ (𝑀 ∈ ℤ ∧ 0 < 𝑀)) | |
| 30 | 27, 28, 29 | sylanbrc 421 | . . 3 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 0 < 𝑀) → 𝑀 ∈ ℕ) |
| 31 | simplr 533 | . . 3 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 0 < 𝑀) → 𝑁 ∈ ℤ) | |
| 32 | dvdsdc 12548 | . . 3 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℤ) → DECID 𝑀 ∥ 𝑁) | |
| 33 | 30, 31, 32 | syl2anc 415 | . 2 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 0 < 𝑀) → DECID 𝑀 ∥ 𝑁) |
| 34 | ztri3or0 9669 | . . 3 ⊢ (𝑀 ∈ ℤ → (𝑀 < 0 ∨ 𝑀 = 0 ∨ 0 < 𝑀)) | |
| 35 | 34 | adantr 276 | . 2 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 < 0 ∨ 𝑀 = 0 ∨ 0 < 𝑀)) |
| 36 | 15, 26, 33, 35 | mpjao3dan 1348 | 1 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID 𝑀 ∥ 𝑁) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 DECID wdc 846 ∨ w3o 1008 = wceq 1402 ∈ wcel 2209 class class class wbr 4128 0cc0 8173 < clt 8354 -cneg 8492 ℕcn 9287 ℤcz 9627 ∥ cdvds 12537 |
| 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 4247 ax-pow 4309 ax-pr 4344 ax-un 4576 ax-setind 4682 ax-cnex 8264 ax-resscn 8265 ax-1cn 8266 ax-1re 8267 ax-icn 8268 ax-addcl 8269 ax-addrcl 8270 ax-mulcl 8271 ax-mulrcl 8272 ax-addcom 8273 ax-mulcom 8274 ax-addass 8275 ax-mulass 8276 ax-distr 8277 ax-i2m1 8278 ax-0lt1 8279 ax-1rid 8280 ax-0id 8281 ax-rnegex 8282 ax-precex 8283 ax-cnre 8284 ax-pre-ltirr 8285 ax-pre-ltwlin 8286 ax-pre-lttrn 8287 ax-pre-apti 8288 ax-pre-ltadd 8289 ax-pre-mulgt0 8290 ax-pre-mulext 8291 ax-arch 8292 |
| 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-rmo 2536 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3714 df-pr 3715 df-op 3717 df-uni 3934 df-int 3969 df-iun 4012 df-br 4129 df-opab 4191 df-mpt 4192 df-id 4436 df-po 4439 df-iso 4440 df-xp 4778 df-rel 4779 df-cnv 4780 df-co 4781 df-dm 4782 df-rn 4783 df-res 4784 df-ima 4785 df-iota 5335 df-fun 5377 df-fn 5378 df-f 5379 df-fv 5383 df-riota 6032 df-ov 6082 df-oprab 6083 df-mpo 6084 df-1st 6368 df-2nd 6369 df-pnf 8356 df-mnf 8357 df-xr 8358 df-ltxr 8359 df-le 8360 df-sub 8493 df-neg 8494 df-reap 8897 df-ap 8904 df-div 8997 df-inn 9288 df-n0 9547 df-z 9628 df-q 10003 df-rp 10038 df-fl 10688 df-mod 10743 df-dvds 12538 |
| This theorem is referenced by: lcmval 12824 lcmcllem 12828 lcmledvds 12831 phiprmpw 12983 pclemdc 13050 pc2dvds 13092 unennn 13271 |
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