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Mirrors > Home > ILE Home > Th. List > 0mnnnnn0 | GIF version |
Description: The result of subtracting a positive integer from 0 is not a nonnegative integer. (Contributed by Alexander van der Vekens, 19-Mar-2018.) |
Ref | Expression |
---|---|
0mnnnnn0 | ⊢ (𝑁 ∈ ℕ → (0 − 𝑁) ∉ ℕ0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0re 7759 | . . 3 ⊢ 0 ∈ ℝ | |
2 | df-neg 7929 | . . . . . 6 ⊢ -𝑁 = (0 − 𝑁) | |
3 | 2 | eqcomi 2141 | . . . . 5 ⊢ (0 − 𝑁) = -𝑁 |
4 | 3 | eleq1i 2203 | . . . 4 ⊢ ((0 − 𝑁) ∈ ℕ0 ↔ -𝑁 ∈ ℕ0) |
5 | nn0ge0 8995 | . . . . 5 ⊢ (-𝑁 ∈ ℕ0 → 0 ≤ -𝑁) | |
6 | nnre 8720 | . . . . . . 7 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℝ) | |
7 | 6 | le0neg1d 8272 | . . . . . 6 ⊢ (𝑁 ∈ ℕ → (𝑁 ≤ 0 ↔ 0 ≤ -𝑁)) |
8 | nngt0 8738 | . . . . . . 7 ⊢ (𝑁 ∈ ℕ → 0 < 𝑁) | |
9 | 0red 7760 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℕ → 0 ∈ ℝ) | |
10 | 6, 9 | lenltd 7873 | . . . . . . . 8 ⊢ (𝑁 ∈ ℕ → (𝑁 ≤ 0 ↔ ¬ 0 < 𝑁)) |
11 | pm2.21 606 | . . . . . . . 8 ⊢ (¬ 0 < 𝑁 → (0 < 𝑁 → ¬ 0 ∈ ℝ)) | |
12 | 10, 11 | syl6bi 162 | . . . . . . 7 ⊢ (𝑁 ∈ ℕ → (𝑁 ≤ 0 → (0 < 𝑁 → ¬ 0 ∈ ℝ))) |
13 | 8, 12 | mpid 42 | . . . . . 6 ⊢ (𝑁 ∈ ℕ → (𝑁 ≤ 0 → ¬ 0 ∈ ℝ)) |
14 | 7, 13 | sylbird 169 | . . . . 5 ⊢ (𝑁 ∈ ℕ → (0 ≤ -𝑁 → ¬ 0 ∈ ℝ)) |
15 | 5, 14 | syl5 32 | . . . 4 ⊢ (𝑁 ∈ ℕ → (-𝑁 ∈ ℕ0 → ¬ 0 ∈ ℝ)) |
16 | 4, 15 | syl5bi 151 | . . 3 ⊢ (𝑁 ∈ ℕ → ((0 − 𝑁) ∈ ℕ0 → ¬ 0 ∈ ℝ)) |
17 | 1, 16 | mt2i 633 | . 2 ⊢ (𝑁 ∈ ℕ → ¬ (0 − 𝑁) ∈ ℕ0) |
18 | df-nel 2402 | . 2 ⊢ ((0 − 𝑁) ∉ ℕ0 ↔ ¬ (0 − 𝑁) ∈ ℕ0) | |
19 | 17, 18 | sylibr 133 | 1 ⊢ (𝑁 ∈ ℕ → (0 − 𝑁) ∉ ℕ0) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ∈ wcel 1480 ∉ wnel 2401 class class class wbr 3924 (class class class)co 5767 ℝcr 7612 0cc0 7613 < clt 7793 ≤ cle 7794 − cmin 7926 -cneg 7927 ℕcn 8713 ℕ0cn0 8970 |
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-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-n0 8971 |
This theorem is referenced by: (None) |
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