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Mirrors > Home > ILE Home > Th. List > znegcl | GIF version |
Description: Closure law for negative integers. (Contributed by NM, 9-May-2004.) |
Ref | Expression |
---|---|
znegcl | ⊢ (𝑁 ∈ ℤ → -𝑁 ∈ ℤ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elz 9049 | . 2 ⊢ (𝑁 ∈ ℤ ↔ (𝑁 ∈ ℝ ∧ (𝑁 = 0 ∨ 𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ))) | |
2 | negeq 7948 | . . . . . 6 ⊢ (𝑁 = 0 → -𝑁 = -0) | |
3 | neg0 8001 | . . . . . 6 ⊢ -0 = 0 | |
4 | 2, 3 | syl6eq 2186 | . . . . 5 ⊢ (𝑁 = 0 → -𝑁 = 0) |
5 | 0z 9058 | . . . . 5 ⊢ 0 ∈ ℤ | |
6 | 4, 5 | eqeltrdi 2228 | . . . 4 ⊢ (𝑁 = 0 → -𝑁 ∈ ℤ) |
7 | nnnegz 9050 | . . . 4 ⊢ (𝑁 ∈ ℕ → -𝑁 ∈ ℤ) | |
8 | nnz 9066 | . . . 4 ⊢ (-𝑁 ∈ ℕ → -𝑁 ∈ ℤ) | |
9 | 6, 7, 8 | 3jaoi 1281 | . . 3 ⊢ ((𝑁 = 0 ∨ 𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ) → -𝑁 ∈ ℤ) |
10 | 9 | adantl 275 | . 2 ⊢ ((𝑁 ∈ ℝ ∧ (𝑁 = 0 ∨ 𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ)) → -𝑁 ∈ ℤ) |
11 | 1, 10 | sylbi 120 | 1 ⊢ (𝑁 ∈ ℤ → -𝑁 ∈ ℤ) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∨ w3o 961 = wceq 1331 ∈ wcel 1480 ℝcr 7612 0cc0 7613 -cneg 7927 ℕcn 8713 ℤcz 9047 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-pow 4093 ax-pr 4126 ax-un 4350 ax-setind 4447 ax-cnex 7704 ax-resscn 7705 ax-1cn 7706 ax-1re 7707 ax-icn 7708 ax-addcl 7709 ax-addrcl 7710 ax-mulcl 7711 ax-addcom 7713 ax-addass 7715 ax-distr 7717 ax-i2m1 7718 ax-0lt1 7719 ax-0id 7721 ax-rnegex 7722 ax-cnre 7724 ax-pre-ltirr 7725 ax-pre-ltwlin 7726 ax-pre-lttrn 7727 ax-pre-ltadd 7729 |
This theorem depends on definitions: df-bi 116 df-3or 963 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ne 2307 df-nel 2402 df-ral 2419 df-rex 2420 df-reu 2421 df-rab 2423 df-v 2683 df-sbc 2905 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-int 3767 df-br 3925 df-opab 3985 df-id 4210 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-iota 5083 df-fun 5120 df-fv 5126 df-riota 5723 df-ov 5770 df-oprab 5771 df-mpo 5772 df-pnf 7795 df-mnf 7796 df-xr 7797 df-ltxr 7798 df-le 7799 df-sub 7928 df-neg 7929 df-inn 8714 df-z 9048 |
This theorem is referenced by: znegclb 9080 nn0negz 9081 peano2zm 9085 zsubcl 9088 zeo 9149 zindd 9162 znegcld 9168 uzneg 9337 qnegcl 9421 fzsubel 9833 fzosubel 9964 ceilid 10081 modqcyc2 10126 expsubap 10334 climshft 11066 negdvdsb 11498 dvdsnegb 11499 summodnegmod 11513 dvdssub 11527 odd2np1 11559 gcdneg 11659 neggcd 11660 gcdabs 11665 bezoutlemaz 11680 bezoutlembz 11681 lcmneg 11744 neglcm 11745 lcmabs 11746 sinperlem 12878 ex-fl 12926 |
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