reorelicc - Mathbox for Alexander van der Vekens

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Theorem reorelicc 47783

Description: Membership in and outside of a closed real interval. (Contributed by AV, 15-Feb-2023.)

**Assertion**
Ref	Expression
reorelicc	⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵) ∨ 𝐵 < 𝐶))

**Proof of Theorem reorelicc**
Step	Hyp	Ref	Expression
1		orc 866	. . . . . . 7 ⊢ (𝐶 < 𝐴 → (𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵)))
2	1	a1d 25	. . . . . 6 ⊢ (𝐶 < 𝐴 → (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) ∧ 𝐶 ≤ 𝐵) → (𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵))))
3		simp3 1136	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → 𝐶 ∈ ℝ)
4	3	ad2antrr 725	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) ∧ 𝐶 ≤ 𝐵) ∧ ¬ 𝐶 < 𝐴) → 𝐶 ∈ ℝ)
5		lenlt 11323	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐴 ≤ 𝐶 ↔ ¬ 𝐶 < 𝐴))
6	5	biimprd 247	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (¬ 𝐶 < 𝐴 → 𝐴 ≤ 𝐶))
7	6	3adant2 1129	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (¬ 𝐶 < 𝐴 → 𝐴 ≤ 𝐶))
8	7	adantr 480	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) ∧ 𝐶 ≤ 𝐵) → (¬ 𝐶 < 𝐴 → 𝐴 ≤ 𝐶))
9	8	imp 406	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) ∧ 𝐶 ≤ 𝐵) ∧ ¬ 𝐶 < 𝐴) → 𝐴 ≤ 𝐶)
10		simplr 768	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) ∧ 𝐶 ≤ 𝐵) ∧ ¬ 𝐶 < 𝐴) → 𝐶 ≤ 𝐵)
11		3simpa 1146	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ))
12	11	ad2antrr 725	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) ∧ 𝐶 ≤ 𝐵) ∧ ¬ 𝐶 < 𝐴) → (𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ))
13		elicc2 13422	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐶 ∈ (𝐴[,]𝐵) ↔ (𝐶 ∈ ℝ ∧ 𝐴 ≤ 𝐶 ∧ 𝐶 ≤ 𝐵)))
14	12, 13	syl 17	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) ∧ 𝐶 ≤ 𝐵) ∧ ¬ 𝐶 < 𝐴) → (𝐶 ∈ (𝐴[,]𝐵) ↔ (𝐶 ∈ ℝ ∧ 𝐴 ≤ 𝐶 ∧ 𝐶 ≤ 𝐵)))
15	4, 9, 10, 14	mpbir3and 1340	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) ∧ 𝐶 ≤ 𝐵) ∧ ¬ 𝐶 < 𝐴) → 𝐶 ∈ (𝐴[,]𝐵))
16	15	olcd 873	. . . . . . 7 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) ∧ 𝐶 ≤ 𝐵) ∧ ¬ 𝐶 < 𝐴) → (𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵)))
17	16	expcom 413	. . . . . 6 ⊢ (¬ 𝐶 < 𝐴 → (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) ∧ 𝐶 ≤ 𝐵) → (𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵))))
18	2, 17	pm2.61i 182	. . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) ∧ 𝐶 ≤ 𝐵) → (𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵)))
19	18	orcd 872	. . . 4 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) ∧ 𝐶 ≤ 𝐵) → ((𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵)) ∨ 𝐵 < 𝐶))
20	19	ex 412	. . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐶 ≤ 𝐵 → ((𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵)) ∨ 𝐵 < 𝐶)))
21		olc 867	. . . 4 ⊢ (𝐵 < 𝐶 → ((𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵)) ∨ 𝐵 < 𝐶))
22	21	a1i 11	. . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐵 < 𝐶 → ((𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵)) ∨ 𝐵 < 𝐶)))
23		simp2 1135	. . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → 𝐵 ∈ ℝ)
24		lelttric 11352	. . . 4 ⊢ ((𝐶 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐶 ≤ 𝐵 ∨ 𝐵 < 𝐶))
25	3, 23, 24	syl2anc 583	. . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐶 ≤ 𝐵 ∨ 𝐵 < 𝐶))
26	20, 22, 25	mpjaod 859	. 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → ((𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵)) ∨ 𝐵 < 𝐶))
27		df-3or 1086	. 2 ⊢ ((𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵) ∨ 𝐵 < 𝐶) ↔ ((𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵)) ∨ 𝐵 < 𝐶))
28	26, 27	sylibr 233	1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐶 < 𝐴 ∨ 𝐶 ∈ (𝐴[,]𝐵) ∨ 𝐵 < 𝐶))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 ∨ wo 846 ∨ w3o 1084 ∧ w3a 1085 ∈ wcel 2099 class class class wbr 5148 (class class class)co 7420 ℝcr 11138 < clt 11279 ≤ cle 11280 [,]cicc 13360

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 2167 ax-ext 2699 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 ax-cnex 11195 ax-resscn 11196 ax-pre-lttri 11213 ax-pre-lttrn 11214

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 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5576 df-po 5590 df-so 5591 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-ov 7423 df-oprab 7424 df-mpo 7425 df-er 8725 df-en 8965 df-dom 8966 df-sdom 8967 df-pnf 11281 df-mnf 11282 df-xr 11283 df-ltxr 11284 df-le 11285 df-icc 13364

This theorem is referenced by: eenglngeehlnmlem2 47811

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