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| Mirrors > Home > MPE Home > Th. List > fzpreddisj | Structured version Visualization version GIF version | ||
| Description: A finite set of sequential integers is disjoint with its predecessor. (Contributed by AV, 24-Aug-2019.) |
| Ref | Expression |
|---|---|
| fzpreddisj | ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → ({𝑀} ∩ ((𝑀 + 1)...𝑁)) = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | incom 4156 | . 2 ⊢ ({𝑀} ∩ ((𝑀 + 1)...𝑁)) = (((𝑀 + 1)...𝑁) ∩ {𝑀}) | |
| 2 | 0lt1 11639 | . . . . . . . 8 ⊢ 0 < 1 | |
| 3 | 0re 11114 | . . . . . . . . 9 ⊢ 0 ∈ ℝ | |
| 4 | 1re 11112 | . . . . . . . . 9 ⊢ 1 ∈ ℝ | |
| 5 | 3, 4 | ltnlei 11234 | . . . . . . . 8 ⊢ (0 < 1 ↔ ¬ 1 ≤ 0) |
| 6 | 2, 5 | mpbi 230 | . . . . . . 7 ⊢ ¬ 1 ≤ 0 |
| 7 | eluzel2 12737 | . . . . . . . . 9 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → 𝑀 ∈ ℤ) | |
| 8 | 7 | zred 12577 | . . . . . . . 8 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → 𝑀 ∈ ℝ) |
| 9 | leaddle0 11632 | . . . . . . . 8 ⊢ ((𝑀 ∈ ℝ ∧ 1 ∈ ℝ) → ((𝑀 + 1) ≤ 𝑀 ↔ 1 ≤ 0)) | |
| 10 | 8, 4, 9 | sylancl 586 | . . . . . . 7 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → ((𝑀 + 1) ≤ 𝑀 ↔ 1 ≤ 0)) |
| 11 | 6, 10 | mtbiri 327 | . . . . . 6 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → ¬ (𝑀 + 1) ≤ 𝑀) |
| 12 | 11 | intnanrd 489 | . . . . 5 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → ¬ ((𝑀 + 1) ≤ 𝑀 ∧ 𝑀 ≤ 𝑁)) |
| 13 | 12 | intnand 488 | . . . 4 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → ¬ (((𝑀 + 1) ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ ((𝑀 + 1) ≤ 𝑀 ∧ 𝑀 ≤ 𝑁))) |
| 14 | elfz2 13414 | . . . 4 ⊢ (𝑀 ∈ ((𝑀 + 1)...𝑁) ↔ (((𝑀 + 1) ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) ∧ ((𝑀 + 1) ≤ 𝑀 ∧ 𝑀 ≤ 𝑁))) | |
| 15 | 13, 14 | sylnibr 329 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → ¬ 𝑀 ∈ ((𝑀 + 1)...𝑁)) |
| 16 | disjsn 4661 | . . 3 ⊢ ((((𝑀 + 1)...𝑁) ∩ {𝑀}) = ∅ ↔ ¬ 𝑀 ∈ ((𝑀 + 1)...𝑁)) | |
| 17 | 15, 16 | sylibr 234 | . 2 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → (((𝑀 + 1)...𝑁) ∩ {𝑀}) = ∅) |
| 18 | 1, 17 | eqtrid 2778 | 1 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → ({𝑀} ∩ ((𝑀 + 1)...𝑁)) = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1086 = wceq 1541 ∈ wcel 2111 ∩ cin 3896 ∅c0 4280 {csn 4573 class class class wbr 5089 ‘cfv 6481 (class class class)co 7346 ℝcr 11005 0cc0 11006 1c1 11007 + caddc 11009 < clt 11146 ≤ cle 11147 ℤcz 12468 ℤ≥cuz 12732 ...cfz 13407 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5232 ax-nul 5242 ax-pow 5301 ax-pr 5368 ax-un 7668 ax-cnex 11062 ax-resscn 11063 ax-1cn 11064 ax-icn 11065 ax-addcl 11066 ax-addrcl 11067 ax-mulcl 11068 ax-mulrcl 11069 ax-mulcom 11070 ax-addass 11071 ax-mulass 11072 ax-distr 11073 ax-i2m1 11074 ax-1ne0 11075 ax-1rid 11076 ax-rnegex 11077 ax-rrecex 11078 ax-cnre 11079 ax-pre-lttri 11080 ax-pre-lttrn 11081 ax-pre-ltadd 11082 ax-pre-mulgt0 11083 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-nul 4281 df-if 4473 df-pw 4549 df-sn 4574 df-pr 4576 df-op 4580 df-uni 4857 df-iun 4941 df-br 5090 df-opab 5152 df-mpt 5171 df-id 5509 df-po 5522 df-so 5523 df-xp 5620 df-rel 5621 df-cnv 5622 df-co 5623 df-dm 5624 df-rn 5625 df-res 5626 df-ima 5627 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-riota 7303 df-ov 7349 df-oprab 7350 df-mpo 7351 df-1st 7921 df-2nd 7922 df-er 8622 df-en 8870 df-dom 8871 df-sdom 8872 df-pnf 11148 df-mnf 11149 df-xr 11150 df-ltxr 11151 df-le 11152 df-sub 11346 df-neg 11347 df-z 12469 df-uz 12733 df-fz 13408 |
| This theorem is referenced by: gsummptfzsplitl 19845 cyclnumvtx 29778 chtvalz 34642 |
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