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Mirrors > Home > MPE Home > Th. List > Mathboxes > iccdisj2 | Structured version Visualization version GIF version |
Description: If the upper bound of one closed interval is less than the lower bound of the other, the intervals are disjoint. (Contributed by Zhi Wang, 9-Sep-2024.) |
Ref | Expression |
---|---|
iccdisj2 | ⊢ ((𝐴 ∈ ℝ* ∧ 𝐷 ∈ ℝ* ∧ 𝐵 < 𝐶) → ((𝐴[,]𝐵) ∩ (𝐶[,]𝐷)) = ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simp1 1133 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐷 ∈ ℝ* ∧ 𝐵 < 𝐶) → 𝐴 ∈ ℝ*) | |
2 | simp3 1135 | . . . . 5 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐷 ∈ ℝ* ∧ 𝐵 < 𝐶) → 𝐵 < 𝐶) | |
3 | ltrelxr 10753 | . . . . . 6 ⊢ < ⊆ (ℝ* × ℝ*) | |
4 | 3 | brel 5591 | . . . . 5 ⊢ (𝐵 < 𝐶 → (𝐵 ∈ ℝ* ∧ 𝐶 ∈ ℝ*)) |
5 | 2, 4 | syl 17 | . . . 4 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐷 ∈ ℝ* ∧ 𝐵 < 𝐶) → (𝐵 ∈ ℝ* ∧ 𝐶 ∈ ℝ*)) |
6 | 5 | simprd 499 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐷 ∈ ℝ* ∧ 𝐵 < 𝐶) → 𝐶 ∈ ℝ*) |
7 | 1 | xrleidd 12599 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐷 ∈ ℝ* ∧ 𝐵 < 𝐶) → 𝐴 ≤ 𝐴) |
8 | iccssico 12864 | . . 3 ⊢ (((𝐴 ∈ ℝ* ∧ 𝐶 ∈ ℝ*) ∧ (𝐴 ≤ 𝐴 ∧ 𝐵 < 𝐶)) → (𝐴[,]𝐵) ⊆ (𝐴[,)𝐶)) | |
9 | 1, 6, 7, 2, 8 | syl22anc 837 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐷 ∈ ℝ* ∧ 𝐵 < 𝐶) → (𝐴[,]𝐵) ⊆ (𝐴[,)𝐶)) |
10 | simp2 1134 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐷 ∈ ℝ* ∧ 𝐵 < 𝐶) → 𝐷 ∈ ℝ*) | |
11 | df-ico 12798 | . . . 4 ⊢ [,) = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥 ≤ 𝑧 ∧ 𝑧 < 𝑦)}) | |
12 | df-icc 12799 | . . . 4 ⊢ [,] = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥 ≤ 𝑧 ∧ 𝑧 ≤ 𝑦)}) | |
13 | xrlenlt 10757 | . . . 4 ⊢ ((𝐶 ∈ ℝ* ∧ 𝑤 ∈ ℝ*) → (𝐶 ≤ 𝑤 ↔ ¬ 𝑤 < 𝐶)) | |
14 | 11, 12, 13 | ixxdisj 12807 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐶 ∈ ℝ* ∧ 𝐷 ∈ ℝ*) → ((𝐴[,)𝐶) ∩ (𝐶[,]𝐷)) = ∅) |
15 | 1, 6, 10, 14 | syl3anc 1368 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐷 ∈ ℝ* ∧ 𝐵 < 𝐶) → ((𝐴[,)𝐶) ∩ (𝐶[,]𝐷)) = ∅) |
16 | 9, 15 | ssdisjd 45627 | 1 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐷 ∈ ℝ* ∧ 𝐵 < 𝐶) → ((𝐴[,]𝐵) ∩ (𝐶[,]𝐷)) = ∅) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 ∧ w3a 1084 = wceq 1538 ∈ wcel 2111 ∩ cin 3859 ⊆ wss 3860 ∅c0 4227 class class class wbr 5036 (class class class)co 7156 ℝ*cxr 10725 < clt 10726 ≤ cle 10727 [,)cico 12794 [,]cicc 12795 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2729 ax-sep 5173 ax-nul 5180 ax-pow 5238 ax-pr 5302 ax-un 7465 ax-cnex 10644 ax-resscn 10645 ax-pre-lttri 10662 ax-pre-lttrn 10663 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-fal 1551 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2557 df-eu 2588 df-clab 2736 df-cleq 2750 df-clel 2830 df-nfc 2901 df-ne 2952 df-nel 3056 df-ral 3075 df-rex 3076 df-rab 3079 df-v 3411 df-sbc 3699 df-csb 3808 df-dif 3863 df-un 3865 df-in 3867 df-ss 3877 df-nul 4228 df-if 4424 df-pw 4499 df-sn 4526 df-pr 4528 df-op 4532 df-uni 4802 df-iun 4888 df-br 5037 df-opab 5099 df-mpt 5117 df-id 5434 df-po 5447 df-so 5448 df-xp 5534 df-rel 5535 df-cnv 5536 df-co 5537 df-dm 5538 df-rn 5539 df-res 5540 df-ima 5541 df-iota 6299 df-fun 6342 df-fn 6343 df-f 6344 df-f1 6345 df-fo 6346 df-f1o 6347 df-fv 6348 df-ov 7159 df-oprab 7160 df-mpo 7161 df-1st 7699 df-2nd 7700 df-er 8305 df-en 8541 df-dom 8542 df-sdom 8543 df-pnf 10728 df-mnf 10729 df-xr 10730 df-ltxr 10731 df-le 10732 df-ico 12798 df-icc 12799 |
This theorem is referenced by: iccdisj 45633 sepfsepc 45660 |
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