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| Mirrors > Home > MPE Home > Th. List > dvdsabsb | Structured version Visualization version GIF version | ||
| Description: An integer divides another iff it divides its absolute value. (Contributed by Paul Chapman, 21-Mar-2011.) |
| Ref | Expression |
|---|---|
| dvdsabsb | ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ∥ 𝑁 ↔ 𝑀 ∥ (abs‘𝑁))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | breq2 5107 | . . . 4 ⊢ ((abs‘𝑁) = 𝑁 → (𝑀 ∥ (abs‘𝑁) ↔ 𝑀 ∥ 𝑁)) | |
| 2 | 1 | bicomd 226 | . . 3 ⊢ ((abs‘𝑁) = 𝑁 → (𝑀 ∥ 𝑁 ↔ 𝑀 ∥ (abs‘𝑁))) |
| 3 | 2 | a1i 11 | . 2 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((abs‘𝑁) = 𝑁 → (𝑀 ∥ 𝑁 ↔ 𝑀 ∥ (abs‘𝑁)))) |
| 4 | dvdsnegb 16423 | . . . 4 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ∥ 𝑁 ↔ 𝑀 ∥ -𝑁)) | |
| 5 | breq2 5107 | . . . . 5 ⊢ ((abs‘𝑁) = -𝑁 → (𝑀 ∥ (abs‘𝑁) ↔ 𝑀 ∥ -𝑁)) | |
| 6 | 5 | bicomd 226 | . . . 4 ⊢ ((abs‘𝑁) = -𝑁 → (𝑀 ∥ -𝑁 ↔ 𝑀 ∥ (abs‘𝑁))) |
| 7 | 4, 6 | sylan9bb 519 | . . 3 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (abs‘𝑁) = -𝑁) → (𝑀 ∥ 𝑁 ↔ 𝑀 ∥ (abs‘𝑁))) |
| 8 | 7 | ex 418 | . 2 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((abs‘𝑁) = -𝑁 → (𝑀 ∥ 𝑁 ↔ 𝑀 ∥ (abs‘𝑁)))) |
| 9 | zre 12678 | . . . 4 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ) | |
| 10 | 9 | absord 15563 | . . 3 ⊢ (𝑁 ∈ ℤ → ((abs‘𝑁) = 𝑁 ∨ (abs‘𝑁) = -𝑁)) |
| 11 | 10 | adantl 487 | . 2 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((abs‘𝑁) = 𝑁 ∨ (abs‘𝑁) = -𝑁)) |
| 12 | 3, 8, 11 | mpjaod 874 | 1 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ∥ 𝑁 ↔ 𝑀 ∥ (abs‘𝑁))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∨ wo 861 = wceq 1570 ∈ wcel 2145 class class class wbr 5103 ‘cfv 6531 -cneg 11523 ℤcz 12674 abscabs 15381 ∥ cdvds 16402 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7740 ax-cnex 11237 ax-resscn 11238 ax-1cn 11239 ax-icn 11240 ax-addcl 11241 ax-addrcl 11242 ax-mulcl 11243 ax-mulrcl 11244 ax-mulcom 11245 ax-addass 11246 ax-mulass 11247 ax-distr 11248 ax-i2m1 11249 ax-1ne0 11250 ax-1rid 11251 ax-rnegex 11252 ax-rrecex 11253 ax-cnre 11254 ax-pre-lttri 11255 ax-pre-lttrn 11256 ax-pre-ltadd 11257 ax-pre-mulgt0 11258 ax-pre-sup 11259 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6297 df-ord 6358 df-on 6359 df-lim 6360 df-suc 6361 df-iota 6487 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7867 df-2nd 7991 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-er 8701 df-en 8958 df-dom 8959 df-sdom 8960 df-sup 9418 df-pnf 11326 df-mnf 11327 df-xr 11328 df-ltxr 11329 df-le 11330 df-sub 11524 df-neg 11525 df-div 11955 df-nn 12317 df-2 12386 df-3 12387 df-n0 12588 df-z 12675 df-uz 12947 df-rp 13102 df-seq 14125 df-exp 14185 df-cj 15246 df-re 15247 df-im 15248 df-sqrt 15382 df-abs 15383 df-dvds 16403 |
| This theorem is used by: dvdsleabs 16461 fzocongeq 16474 divalglem0 16543 divalglem2 16545 bezoutlem4 16695 dvdssq 16722 lcmcllem 16751 lcmdvds 16763 lcmgcdeq 16767 absproddvds 16772 mulgcddvds 16810 pc2dvds 17037 4sqlem11 17113 lgsdirprm 27640 lgsne0 27644 lgsqr 27660 2sqblem 27740 cos9thpiminplylem2 34397 absdvdsabsb 43353 etransclem41 47229 etransclem44 47232 |
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