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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 9951 | . . . . . . 7 ⊢ (𝐷 ∈ (𝐵...𝐶) → 𝐷 ∈ ℤ) | |
3 | 2 | adantr 274 | . . . . . 6 ⊢ ((𝐷 ∈ (𝐵...𝐶) ∧ 𝑥 ∈ (𝐵..^𝐶)) → 𝐷 ∈ ℤ) |
4 | fzospliti 10101 | . . . . . 6 ⊢ ((𝑥 ∈ (𝐵..^𝐶) ∧ 𝐷 ∈ ℤ) → (𝑥 ∈ (𝐵..^𝐷) ∨ 𝑥 ∈ (𝐷..^𝐶))) | |
5 | 1, 3, 4 | syl2anc 409 | . . . . 5 ⊢ ((𝐷 ∈ (𝐵...𝐶) ∧ 𝑥 ∈ (𝐵..^𝐶)) → (𝑥 ∈ (𝐵..^𝐷) ∨ 𝑥 ∈ (𝐷..^𝐶))) |
6 | elun 3258 | . . . . 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 3143 | . 2 ⊢ (𝐷 ∈ (𝐵...𝐶) → (𝐵..^𝐶) ⊆ ((𝐵..^𝐷) ∪ (𝐷..^𝐶))) |
10 | elfzuz3 9948 | . . . 4 ⊢ (𝐷 ∈ (𝐵...𝐶) → 𝐶 ∈ (ℤ≥‘𝐷)) | |
11 | fzoss2 10097 | . . . 4 ⊢ (𝐶 ∈ (ℤ≥‘𝐷) → (𝐵..^𝐷) ⊆ (𝐵..^𝐶)) | |
12 | 10, 11 | syl 14 | . . 3 ⊢ (𝐷 ∈ (𝐵...𝐶) → (𝐵..^𝐷) ⊆ (𝐵..^𝐶)) |
13 | elfzuz 9947 | . . . 4 ⊢ (𝐷 ∈ (𝐵...𝐶) → 𝐷 ∈ (ℤ≥‘𝐵)) | |
14 | fzoss1 10096 | . . . 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 3293 | . 2 ⊢ (𝐷 ∈ (𝐵...𝐶) → ((𝐵..^𝐷) ∪ (𝐷..^𝐶)) ⊆ (𝐵..^𝐶)) |
17 | 9, 16 | eqssd 3154 | 1 ⊢ (𝐷 ∈ (𝐵...𝐶) → (𝐵..^𝐶) = ((𝐵..^𝐷) ∪ (𝐷..^𝐶))) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∨ wo 698 = wceq 1342 ∈ wcel 2135 ∪ cun 3109 ⊆ wss 3111 ‘cfv 5182 (class class class)co 5836 ℤcz 9182 ℤ≥cuz 9457 ...cfz 9935 ..^cfzo 10067 |
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 604 ax-in2 605 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-13 2137 ax-14 2138 ax-ext 2146 ax-sep 4094 ax-pow 4147 ax-pr 4181 ax-un 4405 ax-setind 4508 ax-cnex 7835 ax-resscn 7836 ax-1cn 7837 ax-1re 7838 ax-icn 7839 ax-addcl 7840 ax-addrcl 7841 ax-mulcl 7842 ax-addcom 7844 ax-addass 7846 ax-distr 7848 ax-i2m1 7849 ax-0lt1 7850 ax-0id 7852 ax-rnegex 7853 ax-cnre 7855 ax-pre-ltirr 7856 ax-pre-ltwlin 7857 ax-pre-lttrn 7858 ax-pre-ltadd 7860 |
This theorem depends on definitions: df-bi 116 df-3or 968 df-3an 969 df-tru 1345 df-fal 1348 df-nf 1448 df-sb 1750 df-eu 2016 df-mo 2017 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ne 2335 df-nel 2430 df-ral 2447 df-rex 2448 df-reu 2449 df-rab 2451 df-v 2723 df-sbc 2947 df-csb 3041 df-dif 3113 df-un 3115 df-in 3117 df-ss 3124 df-pw 3555 df-sn 3576 df-pr 3577 df-op 3579 df-uni 3784 df-int 3819 df-iun 3862 df-br 3977 df-opab 4038 df-mpt 4039 df-id 4265 df-xp 4604 df-rel 4605 df-cnv 4606 df-co 4607 df-dm 4608 df-rn 4609 df-res 4610 df-ima 4611 df-iota 5147 df-fun 5184 df-fn 5185 df-f 5186 df-fv 5190 df-riota 5792 df-ov 5839 df-oprab 5840 df-mpo 5841 df-1st 6100 df-2nd 6101 df-pnf 7926 df-mnf 7927 df-xr 7928 df-ltxr 7929 df-le 7930 df-sub 8062 df-neg 8063 df-inn 8849 df-n0 9106 df-z 9183 df-uz 9458 df-fz 9936 df-fzo 10068 |
This theorem is referenced by: fzosplitsnm1 10134 fzo0to42pr 10145 fzo0sn0fzo1 10146 fzosplitsn 10158 |
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