eliccnelico - Mathbox for Glauco Siliprandi

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Theorem eliccnelico 45628

Description: An element of a closed interval that is not a member of the left-closed right-open interval, must be the upper bound. (Contributed by Glauco Siliprandi, 17-Aug-2020.)

**Hypotheses**
Ref	Expression
eliccnelico.1	⊢ (𝜑 → 𝐴 ∈ ℝ^*)
eliccnelico.b	⊢ (𝜑 → 𝐵 ∈ ℝ^*)
eliccnelico.c	⊢ (𝜑 → 𝐶 ∈ (𝐴[,]𝐵))
eliccnelico.nel	⊢ (𝜑 → ¬ 𝐶 ∈ (𝐴[,)𝐵))

**Assertion**
Ref	Expression
eliccnelico	⊢ (𝜑 → 𝐶 = 𝐵)

**Proof of Theorem eliccnelico**
Step	Hyp	Ref	Expression
1		eliccnelico.c	. . 3 ⊢ (𝜑 → 𝐶 ∈ (𝐴[,]𝐵))
2		eliccxr 13335	. . 3 ⊢ (𝐶 ∈ (𝐴[,]𝐵) → 𝐶 ∈ ℝ^*)
3	1, 2	syl 17	. 2 ⊢ (𝜑 → 𝐶 ∈ ℝ^*)
4		eliccnelico.b	. 2 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
5		eliccnelico.1	. . 3 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
6		iccleub 13301	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ (𝐴[,]𝐵)) → 𝐶 ≤ 𝐵)
7	5, 4, 1, 6	syl3anc 1373	. 2 ⊢ (𝜑 → 𝐶 ≤ 𝐵)
8	5	adantr 480	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐶) → 𝐴 ∈ ℝ^*)
9	4	adantr 480	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐶) → 𝐵 ∈ ℝ^*)
10	3	adantr 480	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐶) → 𝐶 ∈ ℝ^*)
11		iccgelb 13302	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ (𝐴[,]𝐵)) → 𝐴 ≤ 𝐶)
12	5, 4, 1, 11	syl3anc 1373	. . . . 5 ⊢ (𝜑 → 𝐴 ≤ 𝐶)
13	12	adantr 480	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐶) → 𝐴 ≤ 𝐶)
14		simpr 484	. . . . 5 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐶) → ¬ 𝐵 ≤ 𝐶)
15		xrltnle 11179	. . . . . . 7 ⊢ ((𝐶 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → (𝐶 < 𝐵 ↔ ¬ 𝐵 ≤ 𝐶))
16	3, 4, 15	syl2anc 584	. . . . . 6 ⊢ (𝜑 → (𝐶 < 𝐵 ↔ ¬ 𝐵 ≤ 𝐶))
17	16	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐶) → (𝐶 < 𝐵 ↔ ¬ 𝐵 ≤ 𝐶))
18	14, 17	mpbird 257	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐶) → 𝐶 < 𝐵)
19	8, 9, 10, 13, 18	elicod 13295	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐶) → 𝐶 ∈ (𝐴[,)𝐵))
20		eliccnelico.nel	. . . 4 ⊢ (𝜑 → ¬ 𝐶 ∈ (𝐴[,)𝐵))
21	20	adantr 480	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐶) → ¬ 𝐶 ∈ (𝐴[,)𝐵))
22	19, 21	condan 817	. 2 ⊢ (𝜑 → 𝐵 ≤ 𝐶)
23	3, 4, 7, 22	xrletrid 13054	1 ⊢ (𝜑 → 𝐶 = 𝐵)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1541 ∈ wcel 2111 class class class wbr 5089 (class class class)co 7346 ℝ^*cxr 11145 < clt 11146 ≤ cle 11147 [,)cico 13247 [,]cicc 13248

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 5232 ax-nul 5242 ax-pow 5301 ax-pr 5368 ax-un 7668 ax-cnex 11062 ax-resscn 11063 ax-pre-lttri 11080 ax-pre-lttrn 11081

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 4281 df-if 4473 df-pw 4549 df-sn 4574 df-pr 4576 df-op 4580 df-uni 4857 df-iun 4941 df-br 5090 df-opab 5152 df-mpt 5171 df-id 5509 df-po 5522 df-so 5523 df-xp 5620 df-rel 5621 df-cnv 5622 df-co 5623 df-dm 5624 df-rn 5625 df-res 5626 df-ima 5627 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-ov 7349 df-oprab 7350 df-mpo 7351 df-1st 7921 df-2nd 7922 df-er 8622 df-en 8870 df-dom 8871 df-sdom 8872 df-pnf 11148 df-mnf 11149 df-xr 11150 df-ltxr 11151 df-le 11152 df-ico 13251 df-icc 13252

This theorem is referenced by: sge0f1o 46479

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