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Theorem ixxdisj 13276

Description: Split an interval into disjoint pieces. (Contributed by Mario Carneiro, 16-Jun-2014.)

**Hypotheses**
Ref	Expression
ixx.1	⊢ 𝑂 = (𝑥 ∈ ℝ^, 𝑦 ∈ ℝ^ ↦ {𝑧 ∈ ℝ^* ∣ (𝑥𝑅𝑧 ∧ 𝑧𝑆𝑦)})
ixxun.2	⊢ 𝑃 = (𝑥 ∈ ℝ^, 𝑦 ∈ ℝ^ ↦ {𝑧 ∈ ℝ^* ∣ (𝑥𝑇𝑧 ∧ 𝑧𝑈𝑦)})
ixxun.3	⊢ ((𝐵 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → (𝐵𝑇𝑤 ↔ ¬ 𝑤𝑆𝐵))

**Assertion**
Ref	Expression
ixxdisj	⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → ((𝐴𝑂𝐵) ∩ (𝐵𝑃𝐶)) = ∅)

Distinct variable groups: 𝑥,𝑤,𝑦,𝑧,𝐴 𝑤,𝐶,𝑥,𝑦,𝑧 𝑤,𝑂 𝑤,𝐵,𝑥,𝑦,𝑧 𝑤,𝑃 𝑥,𝑅,𝑦,𝑧 𝑥,𝑆,𝑦,𝑧 𝑥,𝑇,𝑦,𝑧 𝑥,𝑈,𝑦,𝑧 Allowed substitution hints: 𝑃(𝑥,𝑦,𝑧) 𝑅(𝑤) 𝑆(𝑤) 𝑇(𝑤) 𝑈(𝑤) 𝑂(𝑥,𝑦,𝑧)

**Proof of Theorem ixxdisj**
Step	Hyp	Ref	Expression
1		elin 3917	. . . 4 ⊢ (𝑤 ∈ ((𝐴𝑂𝐵) ∩ (𝐵𝑃𝐶)) ↔ (𝑤 ∈ (𝐴𝑂𝐵) ∧ 𝑤 ∈ (𝐵𝑃𝐶)))
2		ixx.1	. . . . . . . . . . 11 ⊢ 𝑂 = (𝑥 ∈ ℝ^, 𝑦 ∈ ℝ^ ↦ {𝑧 ∈ ℝ^* ∣ (𝑥𝑅𝑧 ∧ 𝑧𝑆𝑦)})
3	2	elixx1 13270	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) → (𝑤 ∈ (𝐴𝑂𝐵) ↔ (𝑤 ∈ ℝ^ ∧ 𝐴𝑅𝑤 ∧ 𝑤𝑆𝐵)))
4	3	3adant3 1132	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝑤 ∈ (𝐴𝑂𝐵) ↔ (𝑤 ∈ ℝ^ ∧ 𝐴𝑅𝑤 ∧ 𝑤𝑆𝐵)))
5	4	biimpa 476	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → (𝑤 ∈ ℝ^ ∧ 𝐴𝑅𝑤 ∧ 𝑤𝑆𝐵))
6	5	simp3d 1144	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → 𝑤𝑆𝐵)
7	6	adantrr 717	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝑤 ∈ (𝐴𝑂𝐵) ∧ 𝑤 ∈ (𝐵𝑃𝐶))) → 𝑤𝑆𝐵)
8		ixxun.2	. . . . . . . . . . . 12 ⊢ 𝑃 = (𝑥 ∈ ℝ^, 𝑦 ∈ ℝ^ ↦ {𝑧 ∈ ℝ^* ∣ (𝑥𝑇𝑧 ∧ 𝑧𝑈𝑦)})
9	8	elixx1 13270	. . . . . . . . . . 11 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝑤 ∈ (𝐵𝑃𝐶) ↔ (𝑤 ∈ ℝ^ ∧ 𝐵𝑇𝑤 ∧ 𝑤𝑈𝐶)))
10	9	3adant1 1130	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝑤 ∈ (𝐵𝑃𝐶) ↔ (𝑤 ∈ ℝ^ ∧ 𝐵𝑇𝑤 ∧ 𝑤𝑈𝐶)))
11	10	biimpa 476	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝑤 ∈ (𝐵𝑃𝐶)) → (𝑤 ∈ ℝ^ ∧ 𝐵𝑇𝑤 ∧ 𝑤𝑈𝐶))
12	11	simp2d 1143	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ 𝑤 ∈ (𝐵𝑃𝐶)) → 𝐵𝑇𝑤)
13		simpl2 1193	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝑤 ∈ (𝐵𝑃𝐶)) → 𝐵 ∈ ℝ^)
14	11	simp1d 1142	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝑤 ∈ (𝐵𝑃𝐶)) → 𝑤 ∈ ℝ^)
15		ixxun.3	. . . . . . . . 9 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → (𝐵𝑇𝑤 ↔ ¬ 𝑤𝑆𝐵))
16	13, 14, 15	syl2anc 584	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ 𝑤 ∈ (𝐵𝑃𝐶)) → (𝐵𝑇𝑤 ↔ ¬ 𝑤𝑆𝐵))
17	12, 16	mpbid 232	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ 𝑤 ∈ (𝐵𝑃𝐶)) → ¬ 𝑤𝑆𝐵)
18	17	adantrl 716	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝑤 ∈ (𝐴𝑂𝐵) ∧ 𝑤 ∈ (𝐵𝑃𝐶))) → ¬ 𝑤𝑆𝐵)
19	7, 18	pm2.65da 816	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → ¬ (𝑤 ∈ (𝐴𝑂𝐵) ∧ 𝑤 ∈ (𝐵𝑃𝐶)))
20	19	pm2.21d 121	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → ((𝑤 ∈ (𝐴𝑂𝐵) ∧ 𝑤 ∈ (𝐵𝑃𝐶)) → 𝑤 ∈ ∅))
21	1, 20	biimtrid 242	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → (𝑤 ∈ ((𝐴𝑂𝐵) ∩ (𝐵𝑃𝐶)) → 𝑤 ∈ ∅))
22	21	ssrdv 3939	. 2 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → ((𝐴𝑂𝐵) ∩ (𝐵𝑃𝐶)) ⊆ ∅)
23		ss0 4354	. 2 ⊢ (((𝐴𝑂𝐵) ∩ (𝐵𝑃𝐶)) ⊆ ∅ → ((𝐴𝑂𝐵) ∩ (𝐵𝑃𝐶)) = ∅)
24	22, 23	syl 17	1 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → ((𝐴𝑂𝐵) ∩ (𝐵𝑃𝐶)) = ∅)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1086 = wceq 1541 ∈ wcel 2113 {crab 3399 ∩ cin 3900 ⊆ wss 3901 ∅c0 4285 class class class wbr 5098 (class class class)co 7358 ∈ cmpo 7360 ℝ^*cxr 11165

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 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pr 5377 ax-un 7680 ax-cnex 11082 ax-resscn 11083

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ral 3052 df-rex 3061 df-rab 3400 df-v 3442 df-sbc 3741 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-br 5099 df-opab 5161 df-id 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-iota 6448 df-fun 6494 df-fv 6500 df-ov 7361 df-oprab 7362 df-mpo 7363 df-xr 11170

This theorem is referenced by: ioodisj 13398 lecldbas 23163 icopnfcld 24711 iocmnfcld 24712 ioombl 25522 ismbf3d 25611 joiniooico 32854 asindmre 37904 dvasin 37905 iocioodisjd 42585 iccdisj2 49152

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