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| Mirrors > Home > MPE Home > Th. List > fz0 | Structured version Visualization version GIF version | ||
| Description: A finite set of sequential integers is empty if its bounds are not integers. (Contributed by AV, 13-Oct-2018.) |
| Ref | Expression |
|---|---|
| fz0 | ⊢ ((𝑀 ∉ ℤ ∨ 𝑁 ∉ ℤ) → (𝑀...𝑁) = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-nel 3065 | . . 3 ⊢ (𝑀 ∉ ℤ ↔ ¬ 𝑀 ∈ ℤ) | |
| 2 | df-nel 3065 | . . 3 ⊢ (𝑁 ∉ ℤ ↔ ¬ 𝑁 ∈ ℤ) | |
| 3 | 1, 2 | orbi12i 927 | . 2 ⊢ ((𝑀 ∉ ℤ ∨ 𝑁 ∉ ℤ) ↔ (¬ 𝑀 ∈ ℤ ∨ ¬ 𝑁 ∈ ℤ)) |
| 4 | ianor 997 | . . 3 ⊢ (¬ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ↔ (¬ 𝑀 ∈ ℤ ∨ ¬ 𝑁 ∈ ℤ)) | |
| 5 | fzf 13534 | . . . . 5 ⊢ ...:(ℤ × ℤ)⟶𝒫 ℤ | |
| 6 | 5 | fdmi 6717 | . . . 4 ⊢ dom ... = (ℤ × ℤ) |
| 7 | 6 | ndmov 7594 | . . 3 ⊢ (¬ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀...𝑁) = ∅) |
| 8 | 4, 7 | sylbir 238 | . 2 ⊢ ((¬ 𝑀 ∈ ℤ ∨ ¬ 𝑁 ∈ ℤ) → (𝑀...𝑁) = ∅) |
| 9 | 3, 8 | sylbi 220 | 1 ⊢ ((𝑀 ∉ ℤ ∨ 𝑁 ∉ ℤ) → (𝑀...𝑁) = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 400 ∨ wo 860 = wceq 1570 ∈ wcel 2143 ∉ wnel 3064 ∅c0 4286 𝒫 cpw 4562 × cxp 5659 (class class class)co 7410 ℤcz 12586 ...cfz 13530 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5257 ax-nul 5269 ax-pr 5404 ax-un 7732 ax-cnex 11151 ax-resscn 11152 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-nel 3065 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-iun 4958 df-br 5110 df-opab 5174 df-mpt 5193 df-id 5556 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-fv 6544 df-ov 7413 df-oprab 7414 df-mpo 7415 df-1st 7982 df-2nd 7983 df-neg 11439 df-z 12587 df-fz 13531 |
| This theorem is referenced by: ply1coedeg 33879 |
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