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Mirrors > Home > ILE Home > Th. List > uzneg | GIF version |
Description: Contraposition law for upper integers. (Contributed by NM, 28-Nov-2005.) |
Ref | Expression |
---|---|
uzneg | ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → -𝑀 ∈ (ℤ≥‘-𝑁)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eluzle 9445 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → 𝑀 ≤ 𝑁) | |
2 | eluzel2 9438 | . . . 4 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → 𝑀 ∈ ℤ) | |
3 | eluzelz 9442 | . . . 4 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → 𝑁 ∈ ℤ) | |
4 | zre 9165 | . . . . 5 ⊢ (𝑀 ∈ ℤ → 𝑀 ∈ ℝ) | |
5 | zre 9165 | . . . . 5 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ) | |
6 | leneg 8334 | . . . . 5 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ) → (𝑀 ≤ 𝑁 ↔ -𝑁 ≤ -𝑀)) | |
7 | 4, 5, 6 | syl2an 287 | . . . 4 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ≤ 𝑁 ↔ -𝑁 ≤ -𝑀)) |
8 | 2, 3, 7 | syl2anc 409 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → (𝑀 ≤ 𝑁 ↔ -𝑁 ≤ -𝑀)) |
9 | 1, 8 | mpbid 146 | . 2 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → -𝑁 ≤ -𝑀) |
10 | znegcl 9192 | . . . 4 ⊢ (𝑁 ∈ ℤ → -𝑁 ∈ ℤ) | |
11 | znegcl 9192 | . . . 4 ⊢ (𝑀 ∈ ℤ → -𝑀 ∈ ℤ) | |
12 | eluz 9446 | . . . 4 ⊢ ((-𝑁 ∈ ℤ ∧ -𝑀 ∈ ℤ) → (-𝑀 ∈ (ℤ≥‘-𝑁) ↔ -𝑁 ≤ -𝑀)) | |
13 | 10, 11, 12 | syl2an 287 | . . 3 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (-𝑀 ∈ (ℤ≥‘-𝑁) ↔ -𝑁 ≤ -𝑀)) |
14 | 3, 2, 13 | syl2anc 409 | . 2 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → (-𝑀 ∈ (ℤ≥‘-𝑁) ↔ -𝑁 ≤ -𝑀)) |
15 | 9, 14 | mpbird 166 | 1 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → -𝑀 ∈ (ℤ≥‘-𝑁)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ↔ wb 104 ∈ wcel 2128 class class class wbr 3965 ‘cfv 5169 ℝcr 7725 ≤ cle 7907 -cneg 8041 ℤcz 9161 ℤ≥cuz 9433 |
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 604 ax-in2 605 ax-io 699 ax-5 1427 ax-7 1428 ax-gen 1429 ax-ie1 1473 ax-ie2 1474 ax-8 1484 ax-10 1485 ax-11 1486 ax-i12 1487 ax-bndl 1489 ax-4 1490 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-13 2130 ax-14 2131 ax-ext 2139 ax-sep 4082 ax-pow 4135 ax-pr 4169 ax-un 4393 ax-setind 4495 ax-cnex 7817 ax-resscn 7818 ax-1cn 7819 ax-1re 7820 ax-icn 7821 ax-addcl 7822 ax-addrcl 7823 ax-mulcl 7824 ax-addcom 7826 ax-addass 7828 ax-distr 7830 ax-i2m1 7831 ax-0lt1 7832 ax-0id 7834 ax-rnegex 7835 ax-cnre 7837 ax-pre-ltirr 7838 ax-pre-ltwlin 7839 ax-pre-lttrn 7840 ax-pre-ltadd 7842 |
This theorem depends on definitions: df-bi 116 df-3or 964 df-3an 965 df-tru 1338 df-fal 1341 df-nf 1441 df-sb 1743 df-eu 2009 df-mo 2010 df-clab 2144 df-cleq 2150 df-clel 2153 df-nfc 2288 df-ne 2328 df-nel 2423 df-ral 2440 df-rex 2441 df-reu 2442 df-rab 2444 df-v 2714 df-sbc 2938 df-dif 3104 df-un 3106 df-in 3108 df-ss 3115 df-pw 3545 df-sn 3566 df-pr 3567 df-op 3569 df-uni 3773 df-int 3808 df-br 3966 df-opab 4026 df-mpt 4027 df-id 4253 df-xp 4591 df-rel 4592 df-cnv 4593 df-co 4594 df-dm 4595 df-rn 4596 df-res 4597 df-ima 4598 df-iota 5134 df-fun 5171 df-fn 5172 df-f 5173 df-fv 5177 df-riota 5777 df-ov 5824 df-oprab 5825 df-mpo 5826 df-pnf 7908 df-mnf 7909 df-xr 7910 df-ltxr 7911 df-le 7912 df-sub 8042 df-neg 8043 df-inn 8828 df-z 9162 df-uz 9434 |
This theorem is referenced by: (None) |
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