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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 9782 | . . . . 5 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → -𝑀 ∈ ℤ) |
| 3 | simpr 110 | . . . . . 6 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → 𝑀 < 0) | |
| 4 | 1 | zred 9780 | . . . . . . 7 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 < 0) → 𝑀 ∈ ℝ) |
| 5 | 4 | lt0neg1d 8851 | . . . . . 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 9666 | . . . . 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 12591 | . . . 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 12600 | . . . . 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 9667 | . . . . 5 ⊢ 0 ∈ ℤ | |
| 17 | zdceq 9732 | . . . . 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 4134 | . . . . . 6 ⊢ (𝑀 = 0 → (𝑀 ∥ 𝑁 ↔ 0 ∥ 𝑁)) | |
| 21 | 20 | adantl 277 | . . . . 5 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 = 0) → (𝑀 ∥ 𝑁 ↔ 0 ∥ 𝑁)) |
| 22 | 0dvds 12604 | . . . . . 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 9666 | . . . 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 12591 | . . 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 9698 | . . 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 |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ↔ wb 105 DECID wdc 846 ∨ w3o 1008 = wceq 1402 ∈ wcel 2209 class class class wbr 4131 0cc0 8186 < clt 8367 -cneg 8506 ℕcn 9314 ℤcz 9656 ∥ cdvds 12580 |
| 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-1cn 8279 ax-1re 8280 ax-icn 8281 ax-addcl 8282 ax-addrcl 8283 ax-mulcl 8284 ax-mulrcl 8285 ax-addcom 8286 ax-mulcom 8287 ax-addass 8288 ax-mulass 8289 ax-distr 8290 ax-i2m1 8291 ax-0lt1 8292 ax-1rid 8293 ax-0id 8294 ax-rnegex 8295 ax-precex 8296 ax-cnre 8297 ax-pre-ltirr 8298 ax-pre-ltwlin 8299 ax-pre-lttrn 8300 ax-pre-apti 8301 ax-pre-ltadd 8302 ax-pre-mulgt0 8303 ax-pre-mulext 8304 ax-arch 8305 |
| This proof 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 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-iun 4014 df-br 4132 df-opab 4194 df-mpt 4195 df-id 4440 df-po 4443 df-iso 4444 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-rn 4787 df-res 4788 df-ima 4789 df-iota 5340 df-fun 5382 df-fn 5383 df-f 5384 df-fv 5388 df-riota 6041 df-ov 6091 df-oprab 6092 df-mpo 6093 df-1st 6378 df-2nd 6379 df-pnf 8369 df-mnf 8370 df-xr 8371 df-ltxr 8372 df-le 8373 df-sub 8507 df-neg 8508 df-reap 8912 df-ap 8919 df-div 9012 df-inn 9315 df-n0 9576 df-z 9657 df-q 10037 df-rp 10073 df-fl 10723 df-mod 10782 df-dvds 12581 |
| This theorem is used by: lcmval 12867 lcmcllem 12871 lcmledvds 12874 phiprmpw 13030 pclemdc 13097 pc2dvds 13139 unennn 13347 |
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