Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > fzdcel | GIF version |
Description: Decidability of membership in a finite interval of integers. (Contributed by Jim Kingdon, 1-Jun-2020.) |
Ref | Expression |
---|---|
fzdcel | ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID 𝐾 ∈ (𝑀...𝑁)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fztri3or 9984 | . 2 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐾 < 𝑀 ∨ 𝐾 ∈ (𝑀...𝑁) ∨ 𝑁 < 𝐾)) | |
2 | zltnle 9247 | . . . . . . 7 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝐾 < 𝑀 ↔ ¬ 𝑀 ≤ 𝐾)) | |
3 | 2 | 3adant3 1012 | . . . . . 6 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐾 < 𝑀 ↔ ¬ 𝑀 ≤ 𝐾)) |
4 | simpl 108 | . . . . . . 7 ⊢ ((𝑀 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁) → 𝑀 ≤ 𝐾) | |
5 | 4 | con3i 627 | . . . . . 6 ⊢ (¬ 𝑀 ≤ 𝐾 → ¬ (𝑀 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁)) |
6 | 3, 5 | syl6bi 162 | . . . . 5 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐾 < 𝑀 → ¬ (𝑀 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁))) |
7 | elfz 9960 | . . . . . 6 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐾 ∈ (𝑀...𝑁) ↔ (𝑀 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁))) | |
8 | 7 | biimpd 143 | . . . . 5 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐾 ∈ (𝑀...𝑁) → (𝑀 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁))) |
9 | 6, 8 | nsyld 643 | . . . 4 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐾 < 𝑀 → ¬ 𝐾 ∈ (𝑀...𝑁))) |
10 | olc 706 | . . . . 5 ⊢ (¬ 𝐾 ∈ (𝑀...𝑁) → (𝐾 ∈ (𝑀...𝑁) ∨ ¬ 𝐾 ∈ (𝑀...𝑁))) | |
11 | df-dc 830 | . . . . 5 ⊢ (DECID 𝐾 ∈ (𝑀...𝑁) ↔ (𝐾 ∈ (𝑀...𝑁) ∨ ¬ 𝐾 ∈ (𝑀...𝑁))) | |
12 | 10, 11 | sylibr 133 | . . . 4 ⊢ (¬ 𝐾 ∈ (𝑀...𝑁) → DECID 𝐾 ∈ (𝑀...𝑁)) |
13 | 9, 12 | syl6 33 | . . 3 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐾 < 𝑀 → DECID 𝐾 ∈ (𝑀...𝑁))) |
14 | orc 707 | . . . . 5 ⊢ (𝐾 ∈ (𝑀...𝑁) → (𝐾 ∈ (𝑀...𝑁) ∨ ¬ 𝐾 ∈ (𝑀...𝑁))) | |
15 | 14, 11 | sylibr 133 | . . . 4 ⊢ (𝐾 ∈ (𝑀...𝑁) → DECID 𝐾 ∈ (𝑀...𝑁)) |
16 | 15 | a1i 9 | . . 3 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐾 ∈ (𝑀...𝑁) → DECID 𝐾 ∈ (𝑀...𝑁))) |
17 | zltnle 9247 | . . . . . . . 8 ⊢ ((𝑁 ∈ ℤ ∧ 𝐾 ∈ ℤ) → (𝑁 < 𝐾 ↔ ¬ 𝐾 ≤ 𝑁)) | |
18 | 17 | ancoms 266 | . . . . . . 7 ⊢ ((𝐾 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑁 < 𝐾 ↔ ¬ 𝐾 ≤ 𝑁)) |
19 | 18 | 3adant2 1011 | . . . . . 6 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑁 < 𝐾 ↔ ¬ 𝐾 ≤ 𝑁)) |
20 | simpr 109 | . . . . . . 7 ⊢ ((𝑀 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁) → 𝐾 ≤ 𝑁) | |
21 | 20 | con3i 627 | . . . . . 6 ⊢ (¬ 𝐾 ≤ 𝑁 → ¬ (𝑀 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁)) |
22 | 19, 21 | syl6bi 162 | . . . . 5 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑁 < 𝐾 → ¬ (𝑀 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁))) |
23 | 22, 8 | nsyld 643 | . . . 4 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑁 < 𝐾 → ¬ 𝐾 ∈ (𝑀...𝑁))) |
24 | 23, 12 | syl6 33 | . . 3 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑁 < 𝐾 → DECID 𝐾 ∈ (𝑀...𝑁))) |
25 | 13, 16, 24 | 3jaod 1299 | . 2 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝐾 < 𝑀 ∨ 𝐾 ∈ (𝑀...𝑁) ∨ 𝑁 < 𝐾) → DECID 𝐾 ∈ (𝑀...𝑁))) |
26 | 1, 25 | mpd 13 | 1 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID 𝐾 ∈ (𝑀...𝑁)) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 103 ↔ wb 104 ∨ wo 703 DECID wdc 829 ∨ w3o 972 ∧ w3a 973 ∈ wcel 2141 class class class wbr 3987 (class class class)co 5851 < clt 7943 ≤ cle 7944 ℤcz 9201 ...cfz 9954 |
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 609 ax-in2 610 ax-io 704 ax-5 1440 ax-7 1441 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-8 1497 ax-10 1498 ax-11 1499 ax-i12 1500 ax-bndl 1502 ax-4 1503 ax-17 1519 ax-i9 1523 ax-ial 1527 ax-i5r 1528 ax-13 2143 ax-14 2144 ax-ext 2152 ax-sep 4105 ax-pow 4158 ax-pr 4192 ax-un 4416 ax-setind 4519 ax-cnex 7854 ax-resscn 7855 ax-1cn 7856 ax-1re 7857 ax-icn 7858 ax-addcl 7859 ax-addrcl 7860 ax-mulcl 7861 ax-addcom 7863 ax-addass 7865 ax-distr 7867 ax-i2m1 7868 ax-0lt1 7869 ax-0id 7871 ax-rnegex 7872 ax-cnre 7874 ax-pre-ltirr 7875 ax-pre-ltwlin 7876 ax-pre-lttrn 7877 ax-pre-ltadd 7879 |
This theorem depends on definitions: df-bi 116 df-dc 830 df-3or 974 df-3an 975 df-tru 1351 df-fal 1354 df-nf 1454 df-sb 1756 df-eu 2022 df-mo 2023 df-clab 2157 df-cleq 2163 df-clel 2166 df-nfc 2301 df-ne 2341 df-nel 2436 df-ral 2453 df-rex 2454 df-reu 2455 df-rab 2457 df-v 2732 df-sbc 2956 df-dif 3123 df-un 3125 df-in 3127 df-ss 3134 df-pw 3566 df-sn 3587 df-pr 3588 df-op 3590 df-uni 3795 df-int 3830 df-br 3988 df-opab 4049 df-id 4276 df-xp 4615 df-rel 4616 df-cnv 4617 df-co 4618 df-dm 4619 df-iota 5158 df-fun 5198 df-fv 5204 df-riota 5807 df-ov 5854 df-oprab 5855 df-mpo 5856 df-pnf 7945 df-mnf 7946 df-xr 7947 df-ltxr 7948 df-le 7949 df-sub 8081 df-neg 8082 df-inn 8868 df-n0 9125 df-z 9202 df-fz 9955 |
This theorem is referenced by: fzodcel 10097 iseqf1olemqcl 10431 iseqf1olemmo 10437 bcval 10672 bccmpl 10677 bcval5 10686 bcpasc 10689 bccl 10690 fisumss 11344 fsum3ser 11349 binomlem 11435 mertenslemi1 11487 fprodssdc 11542 fprodm1 11550 fprodeq0 11569 pcfac 12291 |
Copyright terms: Public domain | W3C validator |