eliccnelico - Mathbox for Glauco Siliprandi

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Theorem eliccnelico 44827

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 13430	. . 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 13397	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ (𝐴[,]𝐵)) → 𝐶 ≤ 𝐵)
7	5, 4, 1, 6	syl3anc 1369	. 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 13398	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ (𝐴[,]𝐵)) → 𝐴 ≤ 𝐶)
12	5, 4, 1, 11	syl3anc 1369	. . . . 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 11297	. . . . . . 7 ⊢ ((𝐶 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → (𝐶 < 𝐵 ↔ ¬ 𝐵 ≤ 𝐶))
16	3, 4, 15	syl2anc 583	. . . . . 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 13392	. . 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 13152	1 ⊢ (𝜑 → 𝐶 = 𝐵)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1534 ∈ wcel 2099 class class class wbr 5142 (class class class)co 7414 ℝ^*cxr 11263 < clt 11264 ≤ cle 11265 [,)cico 13344 [,]cicc 13345

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2164 ax-ext 2698 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7732 ax-cnex 11180 ax-resscn 11181 ax-pre-lttri 11198 ax-pre-lttrn 11199

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2936 df-nel 3042 df-ral 3057 df-rex 3066 df-rab 3428 df-v 3471 df-sbc 3775 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-iun 4993 df-br 5143 df-opab 5205 df-mpt 5226 df-id 5570 df-po 5584 df-so 5585 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-ov 7417 df-oprab 7418 df-mpo 7419 df-1st 7985 df-2nd 7986 df-er 8716 df-en 8954 df-dom 8955 df-sdom 8956 df-pnf 11266 df-mnf 11267 df-xr 11268 df-ltxr 11269 df-le 11270 df-ico 13348 df-icc 13349

This theorem is referenced by: sge0f1o 45683

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