infleinf - Mathbox for Glauco Siliprandi

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Theorem infleinf 45652

Description: If any element of 𝐵 can be approximated from above by members of 𝐴, then the infimum of 𝐴 is less than or equal to the infimum of 𝐵. (Contributed by Glauco Siliprandi, 3-Mar-2021.)

**Hypotheses**
Ref	Expression
infleinf.a	⊢ (𝜑 → 𝐴 ⊆ ℝ^*)
infleinf.b	⊢ (𝜑 → 𝐵 ⊆ ℝ^*)
infleinf.c	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ ℝ⁺) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 𝑦))

**Assertion**
Ref	Expression
infleinf	⊢ (𝜑 → inf(𝐴, ℝ^, < ) ≤ inf(𝐵, ℝ^, < ))

Distinct variable groups: 𝑥,𝐴,𝑦,𝑧 𝑥,𝐵,𝑦,𝑧 𝜑,𝑥,𝑦,𝑧

Proof of Theorem infleinf Dummy variables 𝑟 𝑤 𝑏 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		infleinf.a	. . . . . 6 ⊢ (𝜑 → 𝐴 ⊆ ℝ^*)
2		infxrcl 13253	. . . . . 6 ⊢ (𝐴 ⊆ ℝ^* → inf(𝐴, ℝ^, < ) ∈ ℝ^)
3	1, 2	syl 17	. . . . 5 ⊢ (𝜑 → inf(𝐴, ℝ^, < ) ∈ ℝ^)
4		pnfge 13048	. . . . 5 ⊢ (inf(𝐴, ℝ^, < ) ∈ ℝ^ → inf(𝐴, ℝ^*, < ) ≤ +∞)
5	3, 4	syl 17	. . . 4 ⊢ (𝜑 → inf(𝐴, ℝ^*, < ) ≤ +∞)
6	5	adantr 480	. . 3 ⊢ ((𝜑 ∧ 𝐵 = ∅) → inf(𝐴, ℝ^*, < ) ≤ +∞)
7		infeq1 9384	. . . . . 6 ⊢ (𝐵 = ∅ → inf(𝐵, ℝ^, < ) = inf(∅, ℝ^, < ))
8		xrinf0 13258	. . . . . . 7 ⊢ inf(∅, ℝ^*, < ) = +∞
9	8	a1i 11	. . . . . 6 ⊢ (𝐵 = ∅ → inf(∅, ℝ^*, < ) = +∞)
10	7, 9	eqtrd 2772	. . . . 5 ⊢ (𝐵 = ∅ → inf(𝐵, ℝ^*, < ) = +∞)
11	10	eqcomd 2743	. . . 4 ⊢ (𝐵 = ∅ → +∞ = inf(𝐵, ℝ^*, < ))
12	11	adantl 481	. . 3 ⊢ ((𝜑 ∧ 𝐵 = ∅) → +∞ = inf(𝐵, ℝ^*, < ))
13	6, 12	breqtrd 5125	. 2 ⊢ ((𝜑 ∧ 𝐵 = ∅) → inf(𝐴, ℝ^, < ) ≤ inf(𝐵, ℝ^, < ))
14		neqne 2941	. . . 4 ⊢ (¬ 𝐵 = ∅ → 𝐵 ≠ ∅)
15	14	adantl 481	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐵 = ∅) → 𝐵 ≠ ∅)
16	3	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ inf(𝐵, ℝ^, < ) = -∞) → inf(𝐴, ℝ^, < ) ∈ ℝ^*)
17		id 22	. . . . . . . . . . . . 13 ⊢ (𝑟 ∈ ℝ → 𝑟 ∈ ℝ)
18		2re 12223	. . . . . . . . . . . . . 14 ⊢ 2 ∈ ℝ
19	18	a1i 11	. . . . . . . . . . . . 13 ⊢ (𝑟 ∈ ℝ → 2 ∈ ℝ)
20	17, 19	resubcld 11569	. . . . . . . . . . . 12 ⊢ (𝑟 ∈ ℝ → (𝑟 − 2) ∈ ℝ)
21	20	adantl 481	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ inf(𝐵, ℝ^*, < ) = -∞) ∧ 𝑟 ∈ ℝ) → (𝑟 − 2) ∈ ℝ)
22		simpr 484	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ inf(𝐵, ℝ^, < ) = -∞) → inf(𝐵, ℝ^, < ) = -∞)
23		infleinf.b	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝐵 ⊆ ℝ^*)
24		infxrunb2 45648	. . . . . . . . . . . . . . 15 ⊢ (𝐵 ⊆ ℝ^* → (∀𝑦 ∈ ℝ ∃𝑥 ∈ 𝐵 𝑥 < 𝑦 ↔ inf(𝐵, ℝ^*, < ) = -∞))
25	23, 24	syl 17	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (∀𝑦 ∈ ℝ ∃𝑥 ∈ 𝐵 𝑥 < 𝑦 ↔ inf(𝐵, ℝ^*, < ) = -∞))
26	25	adantr 480	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ inf(𝐵, ℝ^, < ) = -∞) → (∀𝑦 ∈ ℝ ∃𝑥 ∈ 𝐵 𝑥 < 𝑦 ↔ inf(𝐵, ℝ^, < ) = -∞))
27	22, 26	mpbird 257	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ inf(𝐵, ℝ^*, < ) = -∞) → ∀𝑦 ∈ ℝ ∃𝑥 ∈ 𝐵 𝑥 < 𝑦)
28	27	adantr 480	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ inf(𝐵, ℝ^*, < ) = -∞) ∧ 𝑟 ∈ ℝ) → ∀𝑦 ∈ ℝ ∃𝑥 ∈ 𝐵 𝑥 < 𝑦)
29		breq2 5103	. . . . . . . . . . . . 13 ⊢ (𝑦 = (𝑟 − 2) → (𝑥 < 𝑦 ↔ 𝑥 < (𝑟 − 2)))
30	29	rexbidv 3161	. . . . . . . . . . . 12 ⊢ (𝑦 = (𝑟 − 2) → (∃𝑥 ∈ 𝐵 𝑥 < 𝑦 ↔ ∃𝑥 ∈ 𝐵 𝑥 < (𝑟 − 2)))
31	30	rspcva 3575	. . . . . . . . . . 11 ⊢ (((𝑟 − 2) ∈ ℝ ∧ ∀𝑦 ∈ ℝ ∃𝑥 ∈ 𝐵 𝑥 < 𝑦) → ∃𝑥 ∈ 𝐵 𝑥 < (𝑟 − 2))
32	21, 28, 31	syl2anc 585	. . . . . . . . . 10 ⊢ (((𝜑 ∧ inf(𝐵, ℝ^*, < ) = -∞) ∧ 𝑟 ∈ ℝ) → ∃𝑥 ∈ 𝐵 𝑥 < (𝑟 − 2))
33		simpl 482	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝜑)
34		simpr 484	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐵)
35		1rp 12913	. . . . . . . . . . . . . . . . . 18 ⊢ 1 ∈ ℝ⁺
36	35	a1i 11	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 1 ∈ ℝ⁺)
37		1ex 11132	. . . . . . . . . . . . . . . . . 18 ⊢ 1 ∈ V
38		eleq1 2825	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑦 = 1 → (𝑦 ∈ ℝ⁺ ↔ 1 ∈ ℝ⁺))
39	38	3anbi3d 1445	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑦 = 1 → ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ ℝ⁺) ↔ (𝜑 ∧ 𝑥 ∈ 𝐵 ∧ 1 ∈ ℝ⁺)))
40		oveq2 7368	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑦 = 1 → (𝑥 +_𝑒 𝑦) = (𝑥 +_𝑒 1))
41	40	breq2d 5111	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑦 = 1 → (𝑧 ≤ (𝑥 +_𝑒 𝑦) ↔ 𝑧 ≤ (𝑥 +_𝑒 1)))
42	41	rexbidv 3161	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑦 = 1 → (∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 𝑦) ↔ ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 1)))
43	39, 42	imbi12d 344	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑦 = 1 → (((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ ℝ⁺) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 𝑦)) ↔ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ 1 ∈ ℝ⁺) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 1))))
44		infleinf.c	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ ℝ⁺) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 𝑦))
45	37, 43, 44	vtocl 3516	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ 1 ∈ ℝ⁺) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 1))
46	33, 34, 36, 45	syl3anc 1374	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 1))
47	46	adantlr 716	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 1))
48	47	3adant3 1133	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 1))
49		simp1l 1199	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) → 𝜑)
50	49	ad2antrr 727	. . . . . . . . . . . . . . . . . 18 ⊢ (((((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) ∧ 𝑧 ∈ 𝐴) ∧ 𝑧 ≤ (𝑥 +_𝑒 1)) → 𝜑)
51	50, 1	syl 17	. . . . . . . . . . . . . . . . 17 ⊢ (((((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) ∧ 𝑧 ∈ 𝐴) ∧ 𝑧 ≤ (𝑥 +_𝑒 1)) → 𝐴 ⊆ ℝ^*)
52	50, 23	syl 17	. . . . . . . . . . . . . . . . 17 ⊢ (((((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) ∧ 𝑧 ∈ 𝐴) ∧ 𝑧 ≤ (𝑥 +_𝑒 1)) → 𝐵 ⊆ ℝ^*)
53		simp1r 1200	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) → 𝑟 ∈ ℝ)
54	53	ad2antrr 727	. . . . . . . . . . . . . . . . 17 ⊢ (((((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) ∧ 𝑧 ∈ 𝐴) ∧ 𝑧 ≤ (𝑥 +_𝑒 1)) → 𝑟 ∈ ℝ)
55		simp2 1138	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) → 𝑥 ∈ 𝐵)
56	55	ad2antrr 727	. . . . . . . . . . . . . . . . 17 ⊢ (((((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) ∧ 𝑧 ∈ 𝐴) ∧ 𝑧 ≤ (𝑥 +_𝑒 1)) → 𝑥 ∈ 𝐵)
57		simpll3 1216	. . . . . . . . . . . . . . . . 17 ⊢ (((((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) ∧ 𝑧 ∈ 𝐴) ∧ 𝑧 ≤ (𝑥 +_𝑒 1)) → 𝑥 < (𝑟 − 2))
58		simplr 769	. . . . . . . . . . . . . . . . 17 ⊢ (((((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) ∧ 𝑧 ∈ 𝐴) ∧ 𝑧 ≤ (𝑥 +_𝑒 1)) → 𝑧 ∈ 𝐴)
59		simpr 484	. . . . . . . . . . . . . . . . 17 ⊢ (((((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) ∧ 𝑧 ∈ 𝐴) ∧ 𝑧 ≤ (𝑥 +_𝑒 1)) → 𝑧 ≤ (𝑥 +_𝑒 1))
60	51, 52, 54, 56, 57, 58, 59	infleinflem2 45651	. . . . . . . . . . . . . . . 16 ⊢ (((((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) ∧ 𝑧 ∈ 𝐴) ∧ 𝑧 ≤ (𝑥 +_𝑒 1)) → 𝑧 < 𝑟)
61	60	ex 412	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) ∧ 𝑧 ∈ 𝐴) → (𝑧 ≤ (𝑥 +_𝑒 1) → 𝑧 < 𝑟))
62	61	reximdva 3150	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) → (∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 1) → ∃𝑧 ∈ 𝐴 𝑧 < 𝑟))
63	48, 62	mpd 15	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑟 ∈ ℝ) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 < (𝑟 − 2)) → ∃𝑧 ∈ 𝐴 𝑧 < 𝑟)
64	63	3exp 1120	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑟 ∈ ℝ) → (𝑥 ∈ 𝐵 → (𝑥 < (𝑟 − 2) → ∃𝑧 ∈ 𝐴 𝑧 < 𝑟)))
65	64	adantlr 716	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ inf(𝐵, ℝ^*, < ) = -∞) ∧ 𝑟 ∈ ℝ) → (𝑥 ∈ 𝐵 → (𝑥 < (𝑟 − 2) → ∃𝑧 ∈ 𝐴 𝑧 < 𝑟)))
66	65	rexlimdv 3136	. . . . . . . . . 10 ⊢ (((𝜑 ∧ inf(𝐵, ℝ^*, < ) = -∞) ∧ 𝑟 ∈ ℝ) → (∃𝑥 ∈ 𝐵 𝑥 < (𝑟 − 2) → ∃𝑧 ∈ 𝐴 𝑧 < 𝑟))
67	32, 66	mpd 15	. . . . . . . . 9 ⊢ (((𝜑 ∧ inf(𝐵, ℝ^*, < ) = -∞) ∧ 𝑟 ∈ ℝ) → ∃𝑧 ∈ 𝐴 𝑧 < 𝑟)
68	67	ralrimiva 3129	. . . . . . . 8 ⊢ ((𝜑 ∧ inf(𝐵, ℝ^*, < ) = -∞) → ∀𝑟 ∈ ℝ ∃𝑧 ∈ 𝐴 𝑧 < 𝑟)
69		infxrunb2 45648	. . . . . . . . . 10 ⊢ (𝐴 ⊆ ℝ^* → (∀𝑟 ∈ ℝ ∃𝑧 ∈ 𝐴 𝑧 < 𝑟 ↔ inf(𝐴, ℝ^*, < ) = -∞))
70	1, 69	syl 17	. . . . . . . . 9 ⊢ (𝜑 → (∀𝑟 ∈ ℝ ∃𝑧 ∈ 𝐴 𝑧 < 𝑟 ↔ inf(𝐴, ℝ^*, < ) = -∞))
71	70	adantr 480	. . . . . . . 8 ⊢ ((𝜑 ∧ inf(𝐵, ℝ^, < ) = -∞) → (∀𝑟 ∈ ℝ ∃𝑧 ∈ 𝐴 𝑧 < 𝑟 ↔ inf(𝐴, ℝ^, < ) = -∞))
72	68, 71	mpbid 232	. . . . . . 7 ⊢ ((𝜑 ∧ inf(𝐵, ℝ^, < ) = -∞) → inf(𝐴, ℝ^, < ) = -∞)
73	72, 22	eqtr4d 2775	. . . . . 6 ⊢ ((𝜑 ∧ inf(𝐵, ℝ^, < ) = -∞) → inf(𝐴, ℝ^, < ) = inf(𝐵, ℝ^*, < ))
74	16, 73	xreqled 45611	. . . . 5 ⊢ ((𝜑 ∧ inf(𝐵, ℝ^, < ) = -∞) → inf(𝐴, ℝ^, < ) ≤ inf(𝐵, ℝ^*, < ))
75	74	adantlr 716	. . . 4 ⊢ (((𝜑 ∧ 𝐵 ≠ ∅) ∧ inf(𝐵, ℝ^, < ) = -∞) → inf(𝐴, ℝ^, < ) ≤ inf(𝐵, ℝ^*, < ))
76		mnfxr 11193	. . . . . . . 8 ⊢ -∞ ∈ ℝ^*
77	76	a1i 11	. . . . . . 7 ⊢ (𝜑 → -∞ ∈ ℝ^*)
78	77	ad2antrr 727	. . . . . 6 ⊢ (((𝜑 ∧ 𝐵 ≠ ∅) ∧ ¬ inf(𝐵, ℝ^, < ) = -∞) → -∞ ∈ ℝ^)
79		infxrcl 13253	. . . . . . . 8 ⊢ (𝐵 ⊆ ℝ^* → inf(𝐵, ℝ^, < ) ∈ ℝ^)
80	23, 79	syl 17	. . . . . . 7 ⊢ (𝜑 → inf(𝐵, ℝ^, < ) ∈ ℝ^)
81	80	ad2antrr 727	. . . . . 6 ⊢ (((𝜑 ∧ 𝐵 ≠ ∅) ∧ ¬ inf(𝐵, ℝ^, < ) = -∞) → inf(𝐵, ℝ^, < ) ∈ ℝ^*)
82		mnfle 13053	. . . . . . 7 ⊢ (inf(𝐵, ℝ^, < ) ∈ ℝ^ → -∞ ≤ inf(𝐵, ℝ^*, < ))
83	81, 82	syl 17	. . . . . 6 ⊢ (((𝜑 ∧ 𝐵 ≠ ∅) ∧ ¬ inf(𝐵, ℝ^, < ) = -∞) → -∞ ≤ inf(𝐵, ℝ^, < ))
84		neqne 2941	. . . . . . . 8 ⊢ (¬ inf(𝐵, ℝ^, < ) = -∞ → inf(𝐵, ℝ^, < ) ≠ -∞)
85	84	necomd 2988	. . . . . . 7 ⊢ (¬ inf(𝐵, ℝ^, < ) = -∞ → -∞ ≠ inf(𝐵, ℝ^, < ))
86	85	adantl 481	. . . . . 6 ⊢ (((𝜑 ∧ 𝐵 ≠ ∅) ∧ ¬ inf(𝐵, ℝ^, < ) = -∞) → -∞ ≠ inf(𝐵, ℝ^, < ))
87	78, 81, 83, 86	xrleneltd 45604	. . . . 5 ⊢ (((𝜑 ∧ 𝐵 ≠ ∅) ∧ ¬ inf(𝐵, ℝ^, < ) = -∞) → -∞ < inf(𝐵, ℝ^, < ))
88	3	ad2antrr 727	. . . . . 6 ⊢ (((𝜑 ∧ 𝐵 ≠ ∅) ∧ -∞ < inf(𝐵, ℝ^, < )) → inf(𝐴, ℝ^, < ) ∈ ℝ^*)
89	80	ad2antrr 727	. . . . . 6 ⊢ (((𝜑 ∧ 𝐵 ≠ ∅) ∧ -∞ < inf(𝐵, ℝ^, < )) → inf(𝐵, ℝ^, < ) ∈ ℝ^*)
90		nfv 1916	. . . . . . . 8 ⊢ Ⅎ𝑏(((𝜑 ∧ 𝐵 ≠ ∅) ∧ -∞ < inf(𝐵, ℝ^*, < )) ∧ 𝑤 ∈ ℝ⁺)
91	23	ad3antrrr 731	. . . . . . . 8 ⊢ ((((𝜑 ∧ 𝐵 ≠ ∅) ∧ -∞ < inf(𝐵, ℝ^, < )) ∧ 𝑤 ∈ ℝ⁺) → 𝐵 ⊆ ℝ^)
92		simpllr 776	. . . . . . . 8 ⊢ ((((𝜑 ∧ 𝐵 ≠ ∅) ∧ -∞ < inf(𝐵, ℝ^*, < )) ∧ 𝑤 ∈ ℝ⁺) → 𝐵 ≠ ∅)
93		simpr 484	. . . . . . . . . 10 ⊢ ((𝜑 ∧ -∞ < inf(𝐵, ℝ^, < )) → -∞ < inf(𝐵, ℝ^, < ))
94		infxrbnd2 45649	. . . . . . . . . . . 12 ⊢ (𝐵 ⊆ ℝ^* → (∃𝑏 ∈ ℝ ∀𝑥 ∈ 𝐵 𝑏 ≤ 𝑥 ↔ -∞ < inf(𝐵, ℝ^*, < )))
95	23, 94	syl 17	. . . . . . . . . . 11 ⊢ (𝜑 → (∃𝑏 ∈ ℝ ∀𝑥 ∈ 𝐵 𝑏 ≤ 𝑥 ↔ -∞ < inf(𝐵, ℝ^*, < )))
96	95	adantr 480	. . . . . . . . . 10 ⊢ ((𝜑 ∧ -∞ < inf(𝐵, ℝ^, < )) → (∃𝑏 ∈ ℝ ∀𝑥 ∈ 𝐵 𝑏 ≤ 𝑥 ↔ -∞ < inf(𝐵, ℝ^, < )))
97	93, 96	mpbird 257	. . . . . . . . 9 ⊢ ((𝜑 ∧ -∞ < inf(𝐵, ℝ^*, < )) → ∃𝑏 ∈ ℝ ∀𝑥 ∈ 𝐵 𝑏 ≤ 𝑥)
98	97	ad4ant13 752	. . . . . . . 8 ⊢ ((((𝜑 ∧ 𝐵 ≠ ∅) ∧ -∞ < inf(𝐵, ℝ^*, < )) ∧ 𝑤 ∈ ℝ⁺) → ∃𝑏 ∈ ℝ ∀𝑥 ∈ 𝐵 𝑏 ≤ 𝑥)
99		simpr 484	. . . . . . . . 9 ⊢ ((((𝜑 ∧ 𝐵 ≠ ∅) ∧ -∞ < inf(𝐵, ℝ^*, < )) ∧ 𝑤 ∈ ℝ⁺) → 𝑤 ∈ ℝ⁺)
100	99	rphalfcld 12965	. . . . . . . 8 ⊢ ((((𝜑 ∧ 𝐵 ≠ ∅) ∧ -∞ < inf(𝐵, ℝ^*, < )) ∧ 𝑤 ∈ ℝ⁺) → (𝑤 / 2) ∈ ℝ⁺)
101	90, 91, 92, 98, 100	infrpge 45632	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝐵 ≠ ∅) ∧ -∞ < inf(𝐵, ℝ^, < )) ∧ 𝑤 ∈ ℝ⁺) → ∃𝑥 ∈ 𝐵 𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2)))
102		simpll 767	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵) → 𝜑)
103		simpr 484	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐵)
104		rphalfcl 12938	. . . . . . . . . . . . . 14 ⊢ (𝑤 ∈ ℝ⁺ → (𝑤 / 2) ∈ ℝ⁺)
105	104	ad2antlr 728	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵) → (𝑤 / 2) ∈ ℝ⁺)
106		ovex 7393	. . . . . . . . . . . . . 14 ⊢ (𝑤 / 2) ∈ V
107		eleq1 2825	. . . . . . . . . . . . . . . 16 ⊢ (𝑦 = (𝑤 / 2) → (𝑦 ∈ ℝ⁺ ↔ (𝑤 / 2) ∈ ℝ⁺))
108	107	3anbi3d 1445	. . . . . . . . . . . . . . 15 ⊢ (𝑦 = (𝑤 / 2) → ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ ℝ⁺) ↔ (𝜑 ∧ 𝑥 ∈ 𝐵 ∧ (𝑤 / 2) ∈ ℝ⁺)))
109		oveq2 7368	. . . . . . . . . . . . . . . . 17 ⊢ (𝑦 = (𝑤 / 2) → (𝑥 +_𝑒 𝑦) = (𝑥 +_𝑒 (𝑤 / 2)))
110	109	breq2d 5111	. . . . . . . . . . . . . . . 16 ⊢ (𝑦 = (𝑤 / 2) → (𝑧 ≤ (𝑥 +_𝑒 𝑦) ↔ 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2))))
111	110	rexbidv 3161	. . . . . . . . . . . . . . 15 ⊢ (𝑦 = (𝑤 / 2) → (∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 𝑦) ↔ ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2))))
112	108, 111	imbi12d 344	. . . . . . . . . . . . . 14 ⊢ (𝑦 = (𝑤 / 2) → (((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ ℝ⁺) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 𝑦)) ↔ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ (𝑤 / 2) ∈ ℝ⁺) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2)))))
113	106, 112, 44	vtocl 3516	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ (𝑤 / 2) ∈ ℝ⁺) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2)))
114	102, 103, 105, 113	syl3anc 1374	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2)))
115	114	3adant3 1133	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 (𝑤 / 2))) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2)))
116		simp11l 1286	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 (𝑤 / 2))) ∧ 𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2))) → 𝜑)
117	116, 1	syl 17	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2))) ∧ 𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2))) → 𝐴 ⊆ ℝ^)
118	116, 23	syl 17	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2))) ∧ 𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2))) → 𝐵 ⊆ ℝ^)
119		simp11 1205	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 (𝑤 / 2))) ∧ 𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2))) → (𝜑 ∧ 𝑤 ∈ ℝ⁺))
120	119	simprd 495	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 (𝑤 / 2))) ∧ 𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2))) → 𝑤 ∈ ℝ⁺)
121		simp12 1206	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 (𝑤 / 2))) ∧ 𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2))) → 𝑥 ∈ 𝐵)
122		simp3 1139	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2))) → 𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2)))
123	122	3ad2ant1 1134	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2))) ∧ 𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2))) → 𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2)))
124		simp2 1138	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 (𝑤 / 2))) ∧ 𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2))) → 𝑧 ∈ 𝐴)
125		simp3 1139	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 (𝑤 / 2))) ∧ 𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2))) → 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2)))
126	117, 118, 120, 121, 123, 124, 125	infleinflem1 45650	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2))) ∧ 𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2))) → inf(𝐴, ℝ^, < ) ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 𝑤))
127	126	3exp 1120	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2))) → (𝑧 ∈ 𝐴 → (𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2)) → inf(𝐴, ℝ^, < ) ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 𝑤))))
128	127	rexlimdv 3136	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2))) → (∃𝑧 ∈ 𝐴 𝑧 ≤ (𝑥 +_𝑒 (𝑤 / 2)) → inf(𝐴, ℝ^, < ) ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 𝑤)))
129	115, 128	mpd 15	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ⁺) ∧ 𝑥 ∈ 𝐵 ∧ 𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2))) → inf(𝐴, ℝ^, < ) ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 𝑤))
130	129	3exp 1120	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ⁺) → (𝑥 ∈ 𝐵 → (𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2)) → inf(𝐴, ℝ^, < ) ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 𝑤))))
131	130	rexlimdv 3136	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ⁺) → (∃𝑥 ∈ 𝐵 𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2)) → inf(𝐴, ℝ^, < ) ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 𝑤)))
132	131	ad4ant14 753	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝐵 ≠ ∅) ∧ -∞ < inf(𝐵, ℝ^, < )) ∧ 𝑤 ∈ ℝ⁺) → (∃𝑥 ∈ 𝐵 𝑥 ≤ (inf(𝐵, ℝ^, < ) +_𝑒 (𝑤 / 2)) → inf(𝐴, ℝ^, < ) ≤ (inf(𝐵, ℝ^, < ) +_𝑒 𝑤)))
133	101, 132	mpd 15	. . . . . 6 ⊢ ((((𝜑 ∧ 𝐵 ≠ ∅) ∧ -∞ < inf(𝐵, ℝ^, < )) ∧ 𝑤 ∈ ℝ⁺) → inf(𝐴, ℝ^, < ) ≤ (inf(𝐵, ℝ^*, < ) +_𝑒 𝑤))
134	88, 89, 133	xrlexaddrp 45633	. . . . 5 ⊢ (((𝜑 ∧ 𝐵 ≠ ∅) ∧ -∞ < inf(𝐵, ℝ^, < )) → inf(𝐴, ℝ^, < ) ≤ inf(𝐵, ℝ^*, < ))
135	87, 134	syldan 592	. . . 4 ⊢ (((𝜑 ∧ 𝐵 ≠ ∅) ∧ ¬ inf(𝐵, ℝ^, < ) = -∞) → inf(𝐴, ℝ^, < ) ≤ inf(𝐵, ℝ^*, < ))
136	75, 135	pm2.61dan 813	. . 3 ⊢ ((𝜑 ∧ 𝐵 ≠ ∅) → inf(𝐴, ℝ^, < ) ≤ inf(𝐵, ℝ^, < ))
137	15, 136	syldan 592	. 2 ⊢ ((𝜑 ∧ ¬ 𝐵 = ∅) → inf(𝐴, ℝ^, < ) ≤ inf(𝐵, ℝ^, < ))
138	13, 137	pm2.61dan 813	1 ⊢ (𝜑 → inf(𝐴, ℝ^, < ) ≤ inf(𝐵, ℝ^, < ))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1087 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 ∀wral 3052 ∃wrex 3061 ⊆ wss 3902 ∅c0 4286 class class class wbr 5099 (class class class)co 7360 infcinf 9348 ℝcr 11029 1c1 11031 +∞cpnf 11167 -∞cmnf 11168 ℝ^*cxr 11169 < clt 11170 ≤ cle 11171 − cmin 11368 / cdiv 11798 2c2 12204 ℝ⁺crp 12909 +_𝑒 cxad 13028

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5242 ax-nul 5252 ax-pow 5311 ax-pr 5378 ax-un 7682 ax-cnex 11086 ax-resscn 11087 ax-1cn 11088 ax-icn 11089 ax-addcl 11090 ax-addrcl 11091 ax-mulcl 11092 ax-mulrcl 11093 ax-mulcom 11094 ax-addass 11095 ax-mulass 11096 ax-distr 11097 ax-i2m1 11098 ax-1ne0 11099 ax-1rid 11100 ax-rnegex 11101 ax-rrecex 11102 ax-cnre 11103 ax-pre-lttri 11104 ax-pre-lttrn 11105 ax-pre-ltadd 11106 ax-pre-mulgt0 11107 ax-pre-sup 11108

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3062 df-rmo 3351 df-reu 3352 df-rab 3401 df-v 3443 df-sbc 3742 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4287 df-if 4481 df-pw 4557 df-sn 4582 df-pr 4584 df-op 4588 df-uni 4865 df-iun 4949 df-br 5100 df-opab 5162 df-mpt 5181 df-tr 5207 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6260 df-ord 6321 df-on 6322 df-lim 6323 df-suc 6324 df-iota 6449 df-fun 6495 df-fn 6496 df-f 6497 df-f1 6498 df-fo 6499 df-f1o 6500 df-fv 6501 df-riota 7317 df-ov 7363 df-oprab 7364 df-mpo 7365 df-om 7811 df-1st 7935 df-2nd 7936 df-frecs 8225 df-wrecs 8256 df-recs 8305 df-rdg 8343 df-er 8637 df-en 8888 df-dom 8889 df-sdom 8890 df-sup 9349 df-inf 9350 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371 df-div 11799 df-nn 12150 df-2 12212 df-n0 12406 df-z 12493 df-uz 12756 df-q 12866 df-rp 12910 df-xneg 13030 df-xadd 13031

This theorem is referenced by: ovolval5lem3 46934

W3C validator