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| Mirrors > Home > MPE Home > Th. List > fzn | Structured version Visualization version GIF version | ||
| Description: A finite set of sequential integers is empty if the bounds are reversed. (Contributed by NM, 22-Aug-2005.) |
| Ref | Expression |
|---|---|
| fzn | ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑁 < 𝑀 ↔ (𝑀...𝑁) = ∅)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fzn0 13625 | . . . 4 ⊢ ((𝑀...𝑁) ≠ ∅ ↔ 𝑁 ∈ (ℤ≥‘𝑀)) | |
| 2 | eluz 12934 | . . . 4 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑁 ∈ (ℤ≥‘𝑀) ↔ 𝑀 ≤ 𝑁)) | |
| 3 | 1, 2 | bitrid 286 | . . 3 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀...𝑁) ≠ ∅ ↔ 𝑀 ≤ 𝑁)) |
| 4 | zre 12652 | . . . 4 ⊢ (𝑀 ∈ ℤ → 𝑀 ∈ ℝ) | |
| 5 | zre 12652 | . . . 4 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ) | |
| 6 | lenlt 11345 | . . . 4 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ) → (𝑀 ≤ 𝑁 ↔ ¬ 𝑁 < 𝑀)) | |
| 7 | 4, 5, 6 | syl2an 608 | . . 3 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ≤ 𝑁 ↔ ¬ 𝑁 < 𝑀)) |
| 8 | 3, 7 | bitr2d 283 | . 2 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (¬ 𝑁 < 𝑀 ↔ (𝑀...𝑁) ≠ ∅)) |
| 9 | 8 | necon4bbid 2996 | 1 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑁 < 𝑀 ↔ (𝑀...𝑁) = ∅)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ≠ wne 2955 ∅c0 4279 class class class wbr 5103 ‘cfv 6528 (class class class)co 7409 ℝcr 11156 < clt 11300 ≤ cle 11301 ℤcz 12648 ℤ≥cuz 12920 ...cfz 13594 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7735 ax-cnex 11213 ax-resscn 11214 ax-pre-lttri 11231 ax-pre-lttrn 11232 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5543 df-xp 5654 df-rel 5655 df-cnv 5656 df-co 5657 df-dm 5658 df-rn 5659 df-res 5660 df-ima 5661 df-iota 6484 df-fun 6530 df-fn 6531 df-f 6532 df-f1 6533 df-fo 6534 df-f1o 6535 df-fv 6536 df-ov 7412 df-oprab 7413 df-mpo 7414 df-1st 7985 df-2nd 7986 df-er 8696 df-en 8953 df-dom 8954 df-sdom 8955 df-pnf 11302 df-mnf 11303 df-xr 11304 df-ltxr 11305 df-le 11306 df-neg 11501 df-z 12649 df-uz 12921 df-fz 13595 |
| This theorem is used by: fz1n 13629 fz10 13632 fz00m1 13633 fzsuc2 13670 fzm1 13695 fzon 13769 hashfzp1 14529 isumsplit 15962 arisum2 15983 prmreclem4 17044 prmreclem5 17045 ppi1 27440 cht1 27441 ppiublem2 27479 lgsdir2lem3 27603 wlkv0 30149 chtvalz 35178 fz0n 36411 poimirlem10 38462 poimirlem23 38475 poimirlem28 38480 fdc 38593 mettrifi 38605 sticksstones11 43120 fzisoeu 46231 fzdifsuc2 46241 ppivalnn 48633 |
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