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| Mirrors > Home > ILE Home > Th. List > dvdsnegb | GIF version | ||
| Description: An integer divides another iff it divides its negation. (Contributed by Paul Chapman, 21-Mar-2011.) |
| Ref | Expression |
|---|---|
| dvdsnegb | ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ∥ 𝑁 ↔ 𝑀 ∥ -𝑁)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id 19 | . . 3 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) | |
| 2 | znegcl 9607 | . . . 4 ⊢ (𝑁 ∈ ℤ → -𝑁 ∈ ℤ) | |
| 3 | 2 | anim2i 342 | . . 3 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ∈ ℤ ∧ -𝑁 ∈ ℤ)) |
| 4 | znegcl 9607 | . . . 4 ⊢ (𝑥 ∈ ℤ → -𝑥 ∈ ℤ) | |
| 5 | 4 | adantl 277 | . . 3 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑥 ∈ ℤ) → -𝑥 ∈ ℤ) |
| 6 | zcn 9581 | . . . . 5 ⊢ (𝑥 ∈ ℤ → 𝑥 ∈ ℂ) | |
| 7 | zcn 9581 | . . . . 5 ⊢ (𝑀 ∈ ℤ → 𝑀 ∈ ℂ) | |
| 8 | mulneg1 8667 | . . . . . 6 ⊢ ((𝑥 ∈ ℂ ∧ 𝑀 ∈ ℂ) → (-𝑥 · 𝑀) = -(𝑥 · 𝑀)) | |
| 9 | negeq 8465 | . . . . . . 7 ⊢ ((𝑥 · 𝑀) = 𝑁 → -(𝑥 · 𝑀) = -𝑁) | |
| 10 | 9 | eqeq2d 2244 | . . . . . 6 ⊢ ((𝑥 · 𝑀) = 𝑁 → ((-𝑥 · 𝑀) = -(𝑥 · 𝑀) ↔ (-𝑥 · 𝑀) = -𝑁)) |
| 11 | 8, 10 | syl5ibcom 155 | . . . . 5 ⊢ ((𝑥 ∈ ℂ ∧ 𝑀 ∈ ℂ) → ((𝑥 · 𝑀) = 𝑁 → (-𝑥 · 𝑀) = -𝑁)) |
| 12 | 6, 7, 11 | syl2anr 290 | . . . 4 ⊢ ((𝑀 ∈ ℤ ∧ 𝑥 ∈ ℤ) → ((𝑥 · 𝑀) = 𝑁 → (-𝑥 · 𝑀) = -𝑁)) |
| 13 | 12 | adantlr 477 | . . 3 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑥 ∈ ℤ) → ((𝑥 · 𝑀) = 𝑁 → (-𝑥 · 𝑀) = -𝑁)) |
| 14 | 1, 3, 5, 13 | dvds1lem 12484 | . 2 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ∥ 𝑁 → 𝑀 ∥ -𝑁)) |
| 15 | zcn 9581 | . . . . . 6 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℂ) | |
| 16 | negeq 8465 | . . . . . . . . . 10 ⊢ ((𝑥 · 𝑀) = -𝑁 → -(𝑥 · 𝑀) = --𝑁) | |
| 17 | negneg 8522 | . . . . . . . . . 10 ⊢ (𝑁 ∈ ℂ → --𝑁 = 𝑁) | |
| 18 | 16, 17 | sylan9eqr 2287 | . . . . . . . . 9 ⊢ ((𝑁 ∈ ℂ ∧ (𝑥 · 𝑀) = -𝑁) → -(𝑥 · 𝑀) = 𝑁) |
| 19 | 8, 18 | sylan9eq 2285 | . . . . . . . 8 ⊢ (((𝑥 ∈ ℂ ∧ 𝑀 ∈ ℂ) ∧ (𝑁 ∈ ℂ ∧ (𝑥 · 𝑀) = -𝑁)) → (-𝑥 · 𝑀) = 𝑁) |
| 20 | 19 | expr 375 | . . . . . . 7 ⊢ (((𝑥 ∈ ℂ ∧ 𝑀 ∈ ℂ) ∧ 𝑁 ∈ ℂ) → ((𝑥 · 𝑀) = -𝑁 → (-𝑥 · 𝑀) = 𝑁)) |
| 21 | 20 | 3impa 1221 | . . . . . 6 ⊢ ((𝑥 ∈ ℂ ∧ 𝑀 ∈ ℂ ∧ 𝑁 ∈ ℂ) → ((𝑥 · 𝑀) = -𝑁 → (-𝑥 · 𝑀) = 𝑁)) |
| 22 | 6, 7, 15, 21 | syl3an 1316 | . . . . 5 ⊢ ((𝑥 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑥 · 𝑀) = -𝑁 → (-𝑥 · 𝑀) = 𝑁)) |
| 23 | 22 | 3coml 1237 | . . . 4 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑥 ∈ ℤ) → ((𝑥 · 𝑀) = -𝑁 → (-𝑥 · 𝑀) = 𝑁)) |
| 24 | 23 | 3expa 1230 | . . 3 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑥 ∈ ℤ) → ((𝑥 · 𝑀) = -𝑁 → (-𝑥 · 𝑀) = 𝑁)) |
| 25 | 3, 1, 5, 24 | dvds1lem 12484 | . 2 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ∥ -𝑁 → 𝑀 ∥ 𝑁)) |
| 26 | 14, 25 | impbid 129 | 1 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ∥ 𝑁 ↔ 𝑀 ∥ -𝑁)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1398 ∈ wcel 2203 class class class wbr 4108 (class class class)co 6049 ℂcc 8124 · cmul 8131 -cneg 8444 ℤcz 9576 ∥ cdvds 12469 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-sep 4227 ax-pow 4286 ax-pr 4321 ax-un 4553 ax-setind 4658 ax-cnex 8217 ax-resscn 8218 ax-1cn 8219 ax-1re 8220 ax-icn 8221 ax-addcl 8222 ax-addrcl 8223 ax-mulcl 8224 ax-addcom 8226 ax-mulcom 8227 ax-addass 8228 ax-distr 8230 ax-i2m1 8231 ax-0lt1 8232 ax-0id 8234 ax-rnegex 8235 ax-cnre 8237 ax-pre-ltirr 8238 ax-pre-ltwlin 8239 ax-pre-lttrn 8240 ax-pre-ltadd 8242 |
| This theorem depends on definitions: df-bi 117 df-3or 1006 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ne 2413 df-nel 2508 df-ral 2525 df-rex 2526 df-reu 2527 df-rab 2529 df-v 2814 df-sbc 3042 df-dif 3212 df-un 3214 df-in 3216 df-ss 3223 df-pw 3670 df-sn 3694 df-pr 3695 df-op 3697 df-uni 3914 df-int 3949 df-br 4109 df-opab 4171 df-id 4413 df-xp 4754 df-rel 4755 df-cnv 4756 df-co 4757 df-dm 4758 df-iota 5311 df-fun 5353 df-fv 5359 df-riota 6002 df-ov 6052 df-oprab 6053 df-mpo 6054 df-pnf 8309 df-mnf 8310 df-xr 8311 df-ltxr 8312 df-le 8313 df-sub 8445 df-neg 8446 df-inn 9237 df-z 9577 df-dvds 12470 |
| This theorem is referenced by: dvdsabsb 12492 dvdssub 12520 dvdsadd2b 12522 3dvds 12546 bitscmp 12640 gcdneg 12674 bezoutlemaz 12695 bezoutlembz 12696 prmdiv 12928 pcneg 13019 znunit 14799 |
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