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Mirrors > Home > ILE Home > Th. List > fzosplit | GIF version |
Description: Split a half-open integer range in half. (Contributed by Stefan O'Rear, 14-Aug-2015.) |
Ref | Expression |
---|---|
fzosplit | ⊢ (𝐷 ∈ (𝐵...𝐶) → (𝐵..^𝐶) = ((𝐵..^𝐷) ∪ (𝐷..^𝐶))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 109 | . . . . . 6 ⊢ ((𝐷 ∈ (𝐵...𝐶) ∧ 𝑥 ∈ (𝐵..^𝐶)) → 𝑥 ∈ (𝐵..^𝐶)) | |
2 | elfzelz 9774 | . . . . . . 7 ⊢ (𝐷 ∈ (𝐵...𝐶) → 𝐷 ∈ ℤ) | |
3 | 2 | adantr 274 | . . . . . 6 ⊢ ((𝐷 ∈ (𝐵...𝐶) ∧ 𝑥 ∈ (𝐵..^𝐶)) → 𝐷 ∈ ℤ) |
4 | fzospliti 9921 | . . . . . 6 ⊢ ((𝑥 ∈ (𝐵..^𝐶) ∧ 𝐷 ∈ ℤ) → (𝑥 ∈ (𝐵..^𝐷) ∨ 𝑥 ∈ (𝐷..^𝐶))) | |
5 | 1, 3, 4 | syl2anc 408 | . . . . 5 ⊢ ((𝐷 ∈ (𝐵...𝐶) ∧ 𝑥 ∈ (𝐵..^𝐶)) → (𝑥 ∈ (𝐵..^𝐷) ∨ 𝑥 ∈ (𝐷..^𝐶))) |
6 | elun 3187 | . . . . 5 ⊢ (𝑥 ∈ ((𝐵..^𝐷) ∪ (𝐷..^𝐶)) ↔ (𝑥 ∈ (𝐵..^𝐷) ∨ 𝑥 ∈ (𝐷..^𝐶))) | |
7 | 5, 6 | sylibr 133 | . . . 4 ⊢ ((𝐷 ∈ (𝐵...𝐶) ∧ 𝑥 ∈ (𝐵..^𝐶)) → 𝑥 ∈ ((𝐵..^𝐷) ∪ (𝐷..^𝐶))) |
8 | 7 | ex 114 | . . 3 ⊢ (𝐷 ∈ (𝐵...𝐶) → (𝑥 ∈ (𝐵..^𝐶) → 𝑥 ∈ ((𝐵..^𝐷) ∪ (𝐷..^𝐶)))) |
9 | 8 | ssrdv 3073 | . 2 ⊢ (𝐷 ∈ (𝐵...𝐶) → (𝐵..^𝐶) ⊆ ((𝐵..^𝐷) ∪ (𝐷..^𝐶))) |
10 | elfzuz3 9771 | . . . 4 ⊢ (𝐷 ∈ (𝐵...𝐶) → 𝐶 ∈ (ℤ≥‘𝐷)) | |
11 | fzoss2 9917 | . . . 4 ⊢ (𝐶 ∈ (ℤ≥‘𝐷) → (𝐵..^𝐷) ⊆ (𝐵..^𝐶)) | |
12 | 10, 11 | syl 14 | . . 3 ⊢ (𝐷 ∈ (𝐵...𝐶) → (𝐵..^𝐷) ⊆ (𝐵..^𝐶)) |
13 | elfzuz 9770 | . . . 4 ⊢ (𝐷 ∈ (𝐵...𝐶) → 𝐷 ∈ (ℤ≥‘𝐵)) | |
14 | fzoss1 9916 | . . . 4 ⊢ (𝐷 ∈ (ℤ≥‘𝐵) → (𝐷..^𝐶) ⊆ (𝐵..^𝐶)) | |
15 | 13, 14 | syl 14 | . . 3 ⊢ (𝐷 ∈ (𝐵...𝐶) → (𝐷..^𝐶) ⊆ (𝐵..^𝐶)) |
16 | 12, 15 | unssd 3222 | . 2 ⊢ (𝐷 ∈ (𝐵...𝐶) → ((𝐵..^𝐷) ∪ (𝐷..^𝐶)) ⊆ (𝐵..^𝐶)) |
17 | 9, 16 | eqssd 3084 | 1 ⊢ (𝐷 ∈ (𝐵...𝐶) → (𝐵..^𝐶) = ((𝐵..^𝐷) ∪ (𝐷..^𝐶))) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∨ wo 682 = wceq 1316 ∈ wcel 1465 ∪ cun 3039 ⊆ wss 3041 ‘cfv 5093 (class class class)co 5742 ℤcz 9022 ℤ≥cuz 9294 ...cfz 9758 ..^cfzo 9887 |
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 588 ax-in2 589 ax-io 683 ax-5 1408 ax-7 1409 ax-gen 1410 ax-ie1 1454 ax-ie2 1455 ax-8 1467 ax-10 1468 ax-11 1469 ax-i12 1470 ax-bndl 1471 ax-4 1472 ax-13 1476 ax-14 1477 ax-17 1491 ax-i9 1495 ax-ial 1499 ax-i5r 1500 ax-ext 2099 ax-sep 4016 ax-pow 4068 ax-pr 4101 ax-un 4325 ax-setind 4422 ax-cnex 7679 ax-resscn 7680 ax-1cn 7681 ax-1re 7682 ax-icn 7683 ax-addcl 7684 ax-addrcl 7685 ax-mulcl 7686 ax-addcom 7688 ax-addass 7690 ax-distr 7692 ax-i2m1 7693 ax-0lt1 7694 ax-0id 7696 ax-rnegex 7697 ax-cnre 7699 ax-pre-ltirr 7700 ax-pre-ltwlin 7701 ax-pre-lttrn 7702 ax-pre-ltadd 7704 |
This theorem depends on definitions: df-bi 116 df-3or 948 df-3an 949 df-tru 1319 df-fal 1322 df-nf 1422 df-sb 1721 df-eu 1980 df-mo 1981 df-clab 2104 df-cleq 2110 df-clel 2113 df-nfc 2247 df-ne 2286 df-nel 2381 df-ral 2398 df-rex 2399 df-reu 2400 df-rab 2402 df-v 2662 df-sbc 2883 df-csb 2976 df-dif 3043 df-un 3045 df-in 3047 df-ss 3054 df-pw 3482 df-sn 3503 df-pr 3504 df-op 3506 df-uni 3707 df-int 3742 df-iun 3785 df-br 3900 df-opab 3960 df-mpt 3961 df-id 4185 df-xp 4515 df-rel 4516 df-cnv 4517 df-co 4518 df-dm 4519 df-rn 4520 df-res 4521 df-ima 4522 df-iota 5058 df-fun 5095 df-fn 5096 df-f 5097 df-fv 5101 df-riota 5698 df-ov 5745 df-oprab 5746 df-mpo 5747 df-1st 6006 df-2nd 6007 df-pnf 7770 df-mnf 7771 df-xr 7772 df-ltxr 7773 df-le 7774 df-sub 7903 df-neg 7904 df-inn 8689 df-n0 8946 df-z 9023 df-uz 9295 df-fz 9759 df-fzo 9888 |
This theorem is referenced by: fzosplitsnm1 9954 fzo0to42pr 9965 fzo0sn0fzo1 9966 fzosplitsn 9978 |
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