elicoelioo - Mathbox for Thierry Arnoux

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Theorem elicoelioo 32753

Description: Relate elementhood to a closed-below, open-above interval with elementhood to the same open interval or to its lower bound. (Contributed by Thierry Arnoux, 6-Jul-2017.)

**Assertion**
Ref	Expression
elicoelioo	⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) → (𝐶 ∈ (𝐴[,)𝐵) ↔ (𝐶 = 𝐴 ∨ 𝐶 ∈ (𝐴(,)𝐵))))

**Proof of Theorem elicoelioo**
Step	Hyp	Ref	Expression
1		simpl1 1192	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ (𝐶 ∈ (𝐴[,)𝐵) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵))) → 𝐴 ∈ ℝ^*)
2		simpl2 1193	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ (𝐶 ∈ (𝐴[,)𝐵) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵))) → 𝐵 ∈ ℝ^*)
3		simprl 770	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ (𝐶 ∈ (𝐴[,)𝐵) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵))) → 𝐶 ∈ (𝐴[,)𝐵))
4		elico1 13283	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) → (𝐶 ∈ (𝐴[,)𝐵) ↔ (𝐶 ∈ ℝ^ ∧ 𝐴 ≤ 𝐶 ∧ 𝐶 < 𝐵)))
5	4	biimpa 476	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) ∧ 𝐶 ∈ (𝐴[,)𝐵)) → (𝐶 ∈ ℝ^ ∧ 𝐴 ≤ 𝐶 ∧ 𝐶 < 𝐵))
6	5	simp1d 1142	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) ∧ 𝐶 ∈ (𝐴[,)𝐵)) → 𝐶 ∈ ℝ^)
7	1, 2, 3, 6	syl21anc 837	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ (𝐶 ∈ (𝐴[,)𝐵) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵))) → 𝐶 ∈ ℝ^*)
8	5	simp2d 1143	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) ∧ 𝐶 ∈ (𝐴[,)𝐵)) → 𝐴 ≤ 𝐶)
9	1, 2, 3, 8	syl21anc 837	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ (𝐶 ∈ (𝐴[,)𝐵) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵))) → 𝐴 ≤ 𝐶)
10	1, 2	jca 511	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ (𝐶 ∈ (𝐴[,)𝐵) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵))) → (𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*))
11		simprr 772	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ (𝐶 ∈ (𝐴[,)𝐵) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵))) → ¬ 𝐶 ∈ (𝐴(,)𝐵))
12	5	simp3d 1144	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) ∧ 𝐶 ∈ (𝐴[,)𝐵)) → 𝐶 < 𝐵)
13	10, 3, 12	syl2anc 584	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ (𝐶 ∈ (𝐴[,)𝐵) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵))) → 𝐶 < 𝐵)
14		elioo1 13280	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) → (𝐶 ∈ (𝐴(,)𝐵) ↔ (𝐶 ∈ ℝ^ ∧ 𝐴 < 𝐶 ∧ 𝐶 < 𝐵)))
15	14	notbid 318	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) → (¬ 𝐶 ∈ (𝐴(,)𝐵) ↔ ¬ (𝐶 ∈ ℝ^ ∧ 𝐴 < 𝐶 ∧ 𝐶 < 𝐵)))
16	15	biimpa 476	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵)) → ¬ (𝐶 ∈ ℝ^ ∧ 𝐴 < 𝐶 ∧ 𝐶 < 𝐵))
17		3anan32 1096	. . . . . . . . . . . 12 ⊢ ((𝐶 ∈ ℝ^* ∧ 𝐴 < 𝐶 ∧ 𝐶 < 𝐵) ↔ ((𝐶 ∈ ℝ^* ∧ 𝐶 < 𝐵) ∧ 𝐴 < 𝐶))
18	17	notbii 320	. . . . . . . . . . 11 ⊢ (¬ (𝐶 ∈ ℝ^* ∧ 𝐴 < 𝐶 ∧ 𝐶 < 𝐵) ↔ ¬ ((𝐶 ∈ ℝ^* ∧ 𝐶 < 𝐵) ∧ 𝐴 < 𝐶))
19		imnan 399	. . . . . . . . . . 11 ⊢ (((𝐶 ∈ ℝ^* ∧ 𝐶 < 𝐵) → ¬ 𝐴 < 𝐶) ↔ ¬ ((𝐶 ∈ ℝ^* ∧ 𝐶 < 𝐵) ∧ 𝐴 < 𝐶))
20	18, 19	bitr4i 278	. . . . . . . . . 10 ⊢ (¬ (𝐶 ∈ ℝ^* ∧ 𝐴 < 𝐶 ∧ 𝐶 < 𝐵) ↔ ((𝐶 ∈ ℝ^* ∧ 𝐶 < 𝐵) → ¬ 𝐴 < 𝐶))
21	16, 20	sylib 218	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵)) → ((𝐶 ∈ ℝ^ ∧ 𝐶 < 𝐵) → ¬ 𝐴 < 𝐶))
22	21	imp 406	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵)) ∧ (𝐶 ∈ ℝ^ ∧ 𝐶 < 𝐵)) → ¬ 𝐴 < 𝐶)
23	10, 11, 7, 13, 22	syl22anc 838	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ (𝐶 ∈ (𝐴[,)𝐵) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵))) → ¬ 𝐴 < 𝐶)
24		xeqlelt 32751	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → (𝐴 = 𝐶 ↔ (𝐴 ≤ 𝐶 ∧ ¬ 𝐴 < 𝐶)))
25	24	biimpar 477	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (𝐴 ≤ 𝐶 ∧ ¬ 𝐴 < 𝐶)) → 𝐴 = 𝐶)
26	1, 7, 9, 23, 25	syl22anc 838	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ (𝐶 ∈ (𝐴[,)𝐵) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵))) → 𝐴 = 𝐶)
27	26	ex 412	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) → ((𝐶 ∈ (𝐴[,)𝐵) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵)) → 𝐴 = 𝐶))
28		eqcom 2738	. . . . 5 ⊢ (𝐴 = 𝐶 ↔ 𝐶 = 𝐴)
29	27, 28	imbitrdi 251	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) → ((𝐶 ∈ (𝐴[,)𝐵) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵)) → 𝐶 = 𝐴))
30		pm5.6 1003	. . . 4 ⊢ (((𝐶 ∈ (𝐴[,)𝐵) ∧ ¬ 𝐶 ∈ (𝐴(,)𝐵)) → 𝐶 = 𝐴) ↔ (𝐶 ∈ (𝐴[,)𝐵) → (𝐶 ∈ (𝐴(,)𝐵) ∨ 𝐶 = 𝐴)))
31	29, 30	sylib 218	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) → (𝐶 ∈ (𝐴[,)𝐵) → (𝐶 ∈ (𝐴(,)𝐵) ∨ 𝐶 = 𝐴)))
32		orcom 870	. . 3 ⊢ ((𝐶 ∈ (𝐴(,)𝐵) ∨ 𝐶 = 𝐴) ↔ (𝐶 = 𝐴 ∨ 𝐶 ∈ (𝐴(,)𝐵)))
33	31, 32	imbitrdi 251	. 2 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) → (𝐶 ∈ (𝐴[,)𝐵) → (𝐶 = 𝐴 ∨ 𝐶 ∈ (𝐴(,)𝐵))))
34		simpr 484	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ 𝐶 = 𝐴) → 𝐶 = 𝐴)
35		simpl1 1192	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ 𝐶 = 𝐴) → 𝐴 ∈ ℝ^*)
36	34, 35	eqeltrd 2831	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ 𝐶 = 𝐴) → 𝐶 ∈ ℝ^*)
37	35	xrleidd 13046	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ 𝐶 = 𝐴) → 𝐴 ≤ 𝐴)
38	37, 34	breqtrrd 5114	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ 𝐶 = 𝐴) → 𝐴 ≤ 𝐶)
39		simpl3 1194	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ 𝐶 = 𝐴) → 𝐴 < 𝐵)
40	34, 39	eqbrtrd 5108	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ 𝐶 = 𝐴) → 𝐶 < 𝐵)
41		simpl2 1193	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ 𝐶 = 𝐴) → 𝐵 ∈ ℝ^*)
42	35, 41, 4	syl2anc 584	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ 𝐶 = 𝐴) → (𝐶 ∈ (𝐴[,)𝐵) ↔ (𝐶 ∈ ℝ^* ∧ 𝐴 ≤ 𝐶 ∧ 𝐶 < 𝐵)))
43	36, 38, 40, 42	mpbir3and 1343	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ 𝐶 = 𝐴) → 𝐶 ∈ (𝐴[,)𝐵))
44		ioossico 13333	. . . . 5 ⊢ (𝐴(,)𝐵) ⊆ (𝐴[,)𝐵)
45		simpr 484	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ 𝐶 ∈ (𝐴(,)𝐵)) → 𝐶 ∈ (𝐴(,)𝐵))
46	44, 45	sselid 3927	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ 𝐶 ∈ (𝐴(,)𝐵)) → 𝐶 ∈ (𝐴[,)𝐵))
47	43, 46	jaodan 959	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) ∧ (𝐶 = 𝐴 ∨ 𝐶 ∈ (𝐴(,)𝐵))) → 𝐶 ∈ (𝐴[,)𝐵))
48	47	ex 412	. 2 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) → ((𝐶 = 𝐴 ∨ 𝐶 ∈ (𝐴(,)𝐵)) → 𝐶 ∈ (𝐴[,)𝐵)))
49	33, 48	impbid 212	1 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) → (𝐶 ∈ (𝐴[,)𝐵) ↔ (𝐶 = 𝐴 ∨ 𝐶 ∈ (𝐴(,)𝐵))))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∧ wa 395 ∨ wo 847 ∧ w3a 1086 = wceq 1541 ∈ wcel 2111 class class class wbr 5086 (class class class)co 7341 ℝ^*cxr 11140 < clt 11141 ≤ cle 11142 (,)cioo 13240 [,)cico 13242

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 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5229 ax-nul 5239 ax-pow 5298 ax-pr 5365 ax-un 7663 ax-cnex 11057 ax-resscn 11058 ax-pre-lttri 11075 ax-pre-lttrn 11076

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-nul 4279 df-if 4471 df-pw 4547 df-sn 4572 df-pr 4574 df-op 4578 df-uni 4855 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5506 df-po 5519 df-so 5520 df-xp 5617 df-rel 5618 df-cnv 5619 df-co 5620 df-dm 5621 df-rn 5622 df-res 5623 df-ima 5624 df-iota 6432 df-fun 6478 df-fn 6479 df-f 6480 df-f1 6481 df-fo 6482 df-f1o 6483 df-fv 6484 df-ov 7344 df-oprab 7345 df-mpo 7346 df-er 8617 df-en 8865 df-dom 8866 df-sdom 8867 df-pnf 11143 df-mnf 11144 df-xr 11145 df-ltxr 11146 df-le 11147 df-ioo 13244 df-ico 13246

This theorem is referenced by: xrge0mulc1cn 33946

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