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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 8316 | . . 3 ⊢ 0 ∈ ℝ | |
| 2 | df-neg 8490 | . . . . . 6 ⊢ -𝑁 = (0 − 𝑁) | |
| 3 | 2 | eqcomi 2242 | . . . . 5 ⊢ (0 − 𝑁) = -𝑁 |
| 4 | 3 | eleq1i 2304 | . . . 4 ⊢ ((0 − 𝑁) ∈ ℕ0 ↔ -𝑁 ∈ ℕ0) |
| 5 | nn0ge0 9567 | . . . . 5 ⊢ (-𝑁 ∈ ℕ0 → 0 ≤ -𝑁) | |
| 6 | nnre 9290 | . . . . . . 7 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℝ) | |
| 7 | 6 | le0neg1d 8835 | . . . . . 6 ⊢ (𝑁 ∈ ℕ → (𝑁 ≤ 0 ↔ 0 ≤ -𝑁)) |
| 8 | nngt0 9308 | . . . . . . 7 ⊢ (𝑁 ∈ ℕ → 0 < 𝑁) | |
| 9 | 0red 8317 | . . . . . . . . 9 ⊢ (𝑁 ∈ ℕ → 0 ∈ ℝ) | |
| 10 | 6, 9 | lenltd 8434 | . . . . . . . 8 ⊢ (𝑁 ∈ ℕ → (𝑁 ≤ 0 ↔ ¬ 0 < 𝑁)) |
| 11 | pm2.21 626 | . . . . . . . 8 ⊢ (¬ 0 < 𝑁 → (0 < 𝑁 → ¬ 0 ∈ ℝ)) | |
| 12 | 10, 11 | biimtrdi 163 | . . . . . . 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 170 | . . . . 5 ⊢ (𝑁 ∈ ℕ → (0 ≤ -𝑁 → ¬ 0 ∈ ℝ)) |
| 15 | 5, 14 | syl5 32 | . . . 4 ⊢ (𝑁 ∈ ℕ → (-𝑁 ∈ ℕ0 → ¬ 0 ∈ ℝ)) |
| 16 | 4, 15 | biimtrid 152 | . . 3 ⊢ (𝑁 ∈ ℕ → ((0 − 𝑁) ∈ ℕ0 → ¬ 0 ∈ ℝ)) |
| 17 | 1, 16 | mt2i 653 | . 2 ⊢ (𝑁 ∈ ℕ → ¬ (0 − 𝑁) ∈ ℕ0) |
| 18 | df-nel 2516 | . 2 ⊢ ((0 − 𝑁) ∉ ℕ0 ↔ ¬ (0 − 𝑁) ∈ ℕ0) | |
| 19 | 17, 18 | sylibr 134 | 1 ⊢ (𝑁 ∈ ℕ → (0 − 𝑁) ∉ ℕ0) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∈ wcel 2209 ∉ wnel 2515 class class class wbr 4125 (class class class)co 6075 ℝcr 8168 0cc0 8169 < clt 8350 ≤ cle 8351 − cmin 8487 -cneg 8488 ℕcn 9283 ℕ0cn0 9542 |
| 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 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4244 ax-pow 4306 ax-pr 4341 ax-un 4573 ax-setind 4679 ax-cnex 8260 ax-resscn 8261 ax-1cn 8262 ax-1re 8263 ax-icn 8264 ax-addcl 8265 ax-addrcl 8266 ax-mulcl 8267 ax-addcom 8269 ax-addass 8271 ax-distr 8273 ax-i2m1 8274 ax-0lt1 8275 ax-0id 8277 ax-rnegex 8278 ax-cnre 8280 ax-pre-ltirr 8281 ax-pre-ltwlin 8282 ax-pre-lttrn 8283 ax-pre-ltadd 8285 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-int 3966 df-br 4126 df-opab 4188 df-id 4433 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-iota 5332 df-fun 5374 df-fv 5380 df-riota 6028 df-ov 6078 df-oprab 6079 df-mpo 6080 df-pnf 8352 df-mnf 8353 df-xr 8354 df-ltxr 8355 df-le 8356 df-sub 8489 df-neg 8490 df-inn 9284 df-n0 9543 |
| This theorem is referenced by: (None) |
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