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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 9214 | . 2 ⊢ (𝑁 ∈ ℤ ↔ (𝑁 ∈ ℝ ∧ (𝑁 = 0 ∨ 𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ))) | |
2 | negeq 8112 | . . . . . 6 ⊢ (𝑁 = 0 → -𝑁 = -0) | |
3 | neg0 8165 | . . . . . 6 ⊢ -0 = 0 | |
4 | 2, 3 | eqtrdi 2219 | . . . . 5 ⊢ (𝑁 = 0 → -𝑁 = 0) |
5 | 0z 9223 | . . . . 5 ⊢ 0 ∈ ℤ | |
6 | 4, 5 | eqeltrdi 2261 | . . . 4 ⊢ (𝑁 = 0 → -𝑁 ∈ ℤ) |
7 | nnnegz 9215 | . . . 4 ⊢ (𝑁 ∈ ℕ → -𝑁 ∈ ℤ) | |
8 | nnz 9231 | . . . 4 ⊢ (-𝑁 ∈ ℕ → -𝑁 ∈ ℤ) | |
9 | 6, 7, 8 | 3jaoi 1298 | . . 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 972 = wceq 1348 ∈ wcel 2141 ℝcr 7773 0cc0 7774 -cneg 8091 ℕcn 8878 ℤcz 9212 |
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 609 ax-in2 610 ax-io 704 ax-5 1440 ax-7 1441 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-8 1497 ax-10 1498 ax-11 1499 ax-i12 1500 ax-bndl 1502 ax-4 1503 ax-17 1519 ax-i9 1523 ax-ial 1527 ax-i5r 1528 ax-13 2143 ax-14 2144 ax-ext 2152 ax-sep 4107 ax-pow 4160 ax-pr 4194 ax-un 4418 ax-setind 4521 ax-cnex 7865 ax-resscn 7866 ax-1cn 7867 ax-1re 7868 ax-icn 7869 ax-addcl 7870 ax-addrcl 7871 ax-mulcl 7872 ax-addcom 7874 ax-addass 7876 ax-distr 7878 ax-i2m1 7879 ax-0lt1 7880 ax-0id 7882 ax-rnegex 7883 ax-cnre 7885 ax-pre-ltirr 7886 ax-pre-ltwlin 7887 ax-pre-lttrn 7888 ax-pre-ltadd 7890 |
This theorem depends on definitions: df-bi 116 df-3or 974 df-3an 975 df-tru 1351 df-fal 1354 df-nf 1454 df-sb 1756 df-eu 2022 df-mo 2023 df-clab 2157 df-cleq 2163 df-clel 2166 df-nfc 2301 df-ne 2341 df-nel 2436 df-ral 2453 df-rex 2454 df-reu 2455 df-rab 2457 df-v 2732 df-sbc 2956 df-dif 3123 df-un 3125 df-in 3127 df-ss 3134 df-pw 3568 df-sn 3589 df-pr 3590 df-op 3592 df-uni 3797 df-int 3832 df-br 3990 df-opab 4051 df-id 4278 df-xp 4617 df-rel 4618 df-cnv 4619 df-co 4620 df-dm 4621 df-iota 5160 df-fun 5200 df-fv 5206 df-riota 5809 df-ov 5856 df-oprab 5857 df-mpo 5858 df-pnf 7956 df-mnf 7957 df-xr 7958 df-ltxr 7959 df-le 7960 df-sub 8092 df-neg 8093 df-inn 8879 df-z 9213 |
This theorem is referenced by: znegclb 9245 nn0negz 9246 peano2zm 9250 zsubcl 9253 zeo 9317 zindd 9330 znegcld 9336 uzneg 9505 qnegcl 9595 fzsubel 10016 fzosubel 10150 ceilid 10271 modqcyc2 10316 expsubap 10524 climshft 11267 negdvdsb 11769 dvdsnegb 11770 summodnegmod 11784 dvdssub 11800 odd2np1 11832 gcdneg 11937 neggcd 11938 gcdabs 11943 bezoutlemaz 11958 bezoutlembz 11959 lcmneg 12028 neglcm 12029 lcmabs 12030 sinperlem 13523 lgsneg 13719 lgsdir2lem4 13726 lgsdir2lem5 13727 ex-fl 13760 |
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