iocinico - Mathbox for Jon Pennant

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Theorem iocinico 40746

Description: The intersection of two sets that meet at a point is that point. (Contributed by Jon Pennant, 12-Jun-2019.)

**Assertion**
Ref	Expression
iocinico	⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → ((𝐴(,]𝐵) ∩ (𝐵[,)𝐶)) = {𝐵})

Proof of Theorem iocinico Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-in 3873	. . . . . 6 ⊢ ((𝐴(,]𝐵) ∩ (𝐵[,)𝐶)) = {𝑥 ∣ (𝑥 ∈ (𝐴(,]𝐵) ∧ 𝑥 ∈ (𝐵[,)𝐶))}
2		elioc1 12977	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) → (𝑥 ∈ (𝐴(,]𝐵) ↔ (𝑥 ∈ ℝ^ ∧ 𝐴 < 𝑥 ∧ 𝑥 ≤ 𝐵)))
3	2	3adant3 1134	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝑥 ∈ (𝐴(,]𝐵) ↔ (𝑥 ∈ ℝ^ ∧ 𝐴 < 𝑥 ∧ 𝑥 ≤ 𝐵)))
4		3simpb 1151	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝐴 < 𝑥 ∧ 𝑥 ≤ 𝐵) → (𝑥 ∈ ℝ^* ∧ 𝑥 ≤ 𝐵))
5	3, 4	syl6bi 256	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝑥 ∈ (𝐴(,]𝐵) → (𝑥 ∈ ℝ^ ∧ 𝑥 ≤ 𝐵)))
6		elico1 12978	. . . . . . . . . . . 12 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝑥 ∈ (𝐵[,)𝐶) ↔ (𝑥 ∈ ℝ^ ∧ 𝐵 ≤ 𝑥 ∧ 𝑥 < 𝐶)))
7	6	3adant1 1132	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝑥 ∈ (𝐵[,)𝐶) ↔ (𝑥 ∈ ℝ^ ∧ 𝐵 ≤ 𝑥 ∧ 𝑥 < 𝐶)))
8		3simpa 1150	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝐵 ≤ 𝑥 ∧ 𝑥 < 𝐶) → (𝑥 ∈ ℝ^* ∧ 𝐵 ≤ 𝑥))
9	7, 8	syl6bi 256	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝑥 ∈ (𝐵[,)𝐶) → (𝑥 ∈ ℝ^ ∧ 𝐵 ≤ 𝑥)))
10	5, 9	anim12d 612	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → ((𝑥 ∈ (𝐴(,]𝐵) ∧ 𝑥 ∈ (𝐵[,)𝐶)) → ((𝑥 ∈ ℝ^ ∧ 𝑥 ≤ 𝐵) ∧ (𝑥 ∈ ℝ^* ∧ 𝐵 ≤ 𝑥))))
11		simpll 767	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑥 ≤ 𝐵) ∧ (𝑥 ∈ ℝ^* ∧ 𝐵 ≤ 𝑥)) → 𝑥 ∈ ℝ^*)
12		simprr 773	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑥 ≤ 𝐵) ∧ (𝑥 ∈ ℝ^* ∧ 𝐵 ≤ 𝑥)) → 𝐵 ≤ 𝑥)
13		simplr 769	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑥 ≤ 𝐵) ∧ (𝑥 ∈ ℝ^* ∧ 𝐵 ≤ 𝑥)) → 𝑥 ≤ 𝐵)
14	11, 12, 13	3jca 1130	. . . . . . . . 9 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑥 ≤ 𝐵) ∧ (𝑥 ∈ ℝ^* ∧ 𝐵 ≤ 𝑥)) → (𝑥 ∈ ℝ^* ∧ 𝐵 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵))
15	10, 14	syl6 35	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → ((𝑥 ∈ (𝐴(,]𝐵) ∧ 𝑥 ∈ (𝐵[,)𝐶)) → (𝑥 ∈ ℝ^ ∧ 𝐵 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)))
16		elicc1 12979	. . . . . . . . . 10 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) → (𝑥 ∈ (𝐵[,]𝐵) ↔ (𝑥 ∈ ℝ^ ∧ 𝐵 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)))
17	16	anidms 570	. . . . . . . . 9 ⊢ (𝐵 ∈ ℝ^* → (𝑥 ∈ (𝐵[,]𝐵) ↔ (𝑥 ∈ ℝ^* ∧ 𝐵 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)))
18	17	3ad2ant2 1136	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝑥 ∈ (𝐵[,]𝐵) ↔ (𝑥 ∈ ℝ^ ∧ 𝐵 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)))
19	15, 18	sylibrd 262	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → ((𝑥 ∈ (𝐴(,]𝐵) ∧ 𝑥 ∈ (𝐵[,)𝐶)) → 𝑥 ∈ (𝐵[,]𝐵)))
20	19	ss2abdv 3977	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → {𝑥 ∣ (𝑥 ∈ (𝐴(,]𝐵) ∧ 𝑥 ∈ (𝐵[,)𝐶))} ⊆ {𝑥 ∣ 𝑥 ∈ (𝐵[,]𝐵)})
21	1, 20	eqsstrid 3949	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → ((𝐴(,]𝐵) ∩ (𝐵[,)𝐶)) ⊆ {𝑥 ∣ 𝑥 ∈ (𝐵[,]𝐵)})
22		abid2 2879	. . . . 5 ⊢ {𝑥 ∣ 𝑥 ∈ (𝐵[,]𝐵)} = (𝐵[,]𝐵)
23	21, 22	sseqtrdi 3951	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → ((𝐴(,]𝐵) ∩ (𝐵[,)𝐶)) ⊆ (𝐵[,]𝐵))
24	23	adantr 484	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → ((𝐴(,]𝐵) ∩ (𝐵[,)𝐶)) ⊆ (𝐵[,]𝐵))
25		iccid 12980	. . . . 5 ⊢ (𝐵 ∈ ℝ^* → (𝐵[,]𝐵) = {𝐵})
26	25	3ad2ant2 1136	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → (𝐵[,]𝐵) = {𝐵})
27	26	adantr 484	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → (𝐵[,]𝐵) = {𝐵})
28	24, 27	sseqtrd 3941	. 2 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → ((𝐴(,]𝐵) ∩ (𝐵[,)𝐶)) ⊆ {𝐵})
29		simpl2 1194	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → 𝐵 ∈ ℝ^)
30		simprl 771	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → 𝐴 < 𝐵)
31	29	xrleidd 12742	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → 𝐵 ≤ 𝐵)
32		elioc1 12977	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) → (𝐵 ∈ (𝐴(,]𝐵) ↔ (𝐵 ∈ ℝ^ ∧ 𝐴 < 𝐵 ∧ 𝐵 ≤ 𝐵)))
33	32	3adant3 1134	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝐵 ∈ (𝐴(,]𝐵) ↔ (𝐵 ∈ ℝ^ ∧ 𝐴 < 𝐵 ∧ 𝐵 ≤ 𝐵)))
34	33	adantr 484	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → (𝐵 ∈ (𝐴(,]𝐵) ↔ (𝐵 ∈ ℝ^ ∧ 𝐴 < 𝐵 ∧ 𝐵 ≤ 𝐵)))
35	29, 30, 31, 34	mpbir3and 1344	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → 𝐵 ∈ (𝐴(,]𝐵))
36		simprr 773	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → 𝐵 < 𝐶)
37		elico1 12978	. . . . . . 7 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝐵 ∈ (𝐵[,)𝐶) ↔ (𝐵 ∈ ℝ^ ∧ 𝐵 ≤ 𝐵 ∧ 𝐵 < 𝐶)))
38	37	3adant1 1132	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝐵 ∈ (𝐵[,)𝐶) ↔ (𝐵 ∈ ℝ^ ∧ 𝐵 ≤ 𝐵 ∧ 𝐵 < 𝐶)))
39	38	adantr 484	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → (𝐵 ∈ (𝐵[,)𝐶) ↔ (𝐵 ∈ ℝ^ ∧ 𝐵 ≤ 𝐵 ∧ 𝐵 < 𝐶)))
40	29, 31, 36, 39	mpbir3and 1344	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → 𝐵 ∈ (𝐵[,)𝐶))
41	35, 40	elind 4108	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → 𝐵 ∈ ((𝐴(,]𝐵) ∩ (𝐵[,)𝐶)))
42	41	snssd 4722	. 2 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → {𝐵} ⊆ ((𝐴(,]𝐵) ∩ (𝐵[,)𝐶)))
43	28, 42	eqssd 3918	1 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝐴 < 𝐵 ∧ 𝐵 < 𝐶)) → ((𝐴(,]𝐵) ∩ (𝐵[,)𝐶)) = {𝐵})

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 ∧ w3a 1089 = wceq 1543 ∈ wcel 2110 {cab 2714 ∩ cin 3865 ⊆ wss 3866 {csn 4541 class class class wbr 5053 (class class class)co 7213 ℝ^*cxr 10866 < clt 10867 ≤ cle 10868 (,]cioc 12936 [,)cico 12937 [,]cicc 12938

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2708 ax-sep 5192 ax-nul 5199 ax-pow 5258 ax-pr 5322 ax-un 7523 ax-cnex 10785 ax-resscn 10786 ax-pre-lttri 10803 ax-pre-lttrn 10804

This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2071 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2886 df-ne 2941 df-nel 3047 df-ral 3066 df-rex 3067 df-rab 3070 df-v 3410 df-sbc 3695 df-csb 3812 df-dif 3869 df-un 3871 df-in 3873 df-ss 3883 df-nul 4238 df-if 4440 df-pw 4515 df-sn 4542 df-pr 4544 df-op 4548 df-uni 4820 df-br 5054 df-opab 5116 df-mpt 5136 df-id 5455 df-po 5468 df-so 5469 df-xp 5557 df-rel 5558 df-cnv 5559 df-co 5560 df-dm 5561 df-rn 5562 df-res 5563 df-ima 5564 df-iota 6338 df-fun 6382 df-fn 6383 df-f 6384 df-f1 6385 df-fo 6386 df-f1o 6387 df-fv 6388 df-ov 7216 df-oprab 7217 df-mpo 7218 df-er 8391 df-en 8627 df-dom 8628 df-sdom 8629 df-pnf 10869 df-mnf 10870 df-xr 10871 df-ltxr 10872 df-le 10873 df-ioc 12940 df-ico 12941 df-icc 12942

This theorem is referenced by: (None)

W3C validator