Theorem upbdrech 42734

Description: Choice of an upper bound for a nonempty bunded set (image set version). (Contributed by Glauco Siliprandi, 11-Dec-2019.)

Hypotheses

Ref	Expression
upbdrech.a	⊢ (𝜑 → 𝐴 ≠ ∅)
upbdrech.b	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℝ)
upbdrech.bd	⊢ (𝜑 → ∃𝑦 ∈ ℝ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦)
upbdrech.c	⊢ 𝐶 = sup({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}, ℝ, < )

Assertion

Ref	Expression
upbdrech	⊢ (𝜑 → (𝐶 ∈ ℝ ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝐶))

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

Allowed substitution hints:   𝜑(𝑧)   𝐵(𝑥)   𝐶(𝑥,𝑦,𝑧)

Proof of Theorem upbdrech

Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		upbdrech.c	. . 3 ⊢ 𝐶 = sup({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}, ℝ, < )
2		upbdrech.b	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℝ)
3	2	ralrimiva 3107	. . . . 5 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ)
4		nfra1 3142	. . . . . . 7 ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ
5		nfv 1918	. . . . . . 7 ⊢ Ⅎ𝑥 𝑧 ∈ ℝ
6		simp3 1136	. . . . . . . . 9 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ ∧ 𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵) → 𝑧 = 𝐵)
7		rspa 3130	. . . . . . . . . 10 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℝ)
8	7	3adant3 1130	. . . . . . . . 9 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ ∧ 𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵) → 𝐵 ∈ ℝ)
9	6, 8	eqeltrd 2839	. . . . . . . 8 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ ∧ 𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵) → 𝑧 ∈ ℝ)
10	9	3exp 1117	. . . . . . 7 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ → (𝑥 ∈ 𝐴 → (𝑧 = 𝐵 → 𝑧 ∈ ℝ)))
11	4, 5, 10	rexlimd 3245	. . . . . 6 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ → (∃𝑥 ∈ 𝐴 𝑧 = 𝐵 → 𝑧 ∈ ℝ))
12	11	abssdv 3998	. . . . 5 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ → {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ⊆ ℝ)
13	3, 12	syl 17	. . . 4 ⊢ (𝜑 → {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ⊆ ℝ)
14		upbdrech.a	. . . . . . 7 ⊢ (𝜑 → 𝐴 ≠ ∅)
15		eqidd 2739	. . . . . . . 8 ⊢ (𝑥 ∈ 𝐴 → 𝐵 = 𝐵)
16	15	rgen 3073	. . . . . . 7 ⊢ ∀𝑥 ∈ 𝐴 𝐵 = 𝐵
17		r19.2z 4422	. . . . . . 7 ⊢ ((𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 𝐵 = 𝐵) → ∃𝑥 ∈ 𝐴 𝐵 = 𝐵)
18	14, 16, 17	sylancl 585	. . . . . 6 ⊢ (𝜑 → ∃𝑥 ∈ 𝐴 𝐵 = 𝐵)
19		nfv 1918	. . . . . . 7 ⊢ Ⅎ𝑥𝜑
20		nfre1 3234	. . . . . . . 8 ⊢ Ⅎ𝑥∃𝑥 ∈ 𝐴 𝑧 = 𝐵
21	20	nfex 2322	. . . . . . 7 ⊢ Ⅎ𝑥∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵
22		simpr 484	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ 𝐴)
23		elex 3440	. . . . . . . . . . . . 13 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ V)
24	2, 23	syl 17	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ V)
25		isset 3435	. . . . . . . . . . . 12 ⊢ (𝐵 ∈ V ↔ ∃𝑧 𝑧 = 𝐵)
26	24, 25	sylib 217	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∃𝑧 𝑧 = 𝐵)
27		rspe 3232	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ 𝐴 ∧ ∃𝑧 𝑧 = 𝐵) → ∃𝑥 ∈ 𝐴 ∃𝑧 𝑧 = 𝐵)
28	22, 26, 27	syl2anc 583	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∃𝑥 ∈ 𝐴 ∃𝑧 𝑧 = 𝐵)
29		rexcom4 3179	. . . . . . . . . 10 ⊢ (∃𝑥 ∈ 𝐴 ∃𝑧 𝑧 = 𝐵 ↔ ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)
30	28, 29	sylib 217	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)
31	30	3adant3 1130	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴 ∧ 𝐵 = 𝐵) → ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)
32	31	3exp 1117	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ 𝐴 → (𝐵 = 𝐵 → ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)))
33	19, 21, 32	rexlimd 3245	. . . . . 6 ⊢ (𝜑 → (∃𝑥 ∈ 𝐴 𝐵 = 𝐵 → ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵))
34	18, 33	mpd 15	. . . . 5 ⊢ (𝜑 → ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)
35		abn0 4311	. . . . 5 ⊢ ({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ≠ ∅ ↔ ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)
36	34, 35	sylibr 233	. . . 4 ⊢ (𝜑 → {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ≠ ∅)
37		upbdrech.bd	. . . . 5 ⊢ (𝜑 → ∃𝑦 ∈ ℝ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦)
38		vex 3426	. . . . . . . . . . . . 13 ⊢ 𝑤 ∈ V
39		eqeq1 2742	. . . . . . . . . . . . . 14 ⊢ (𝑧 = 𝑤 → (𝑧 = 𝐵 ↔ 𝑤 = 𝐵))
40	39	rexbidv 3225	. . . . . . . . . . . . 13 ⊢ (𝑧 = 𝑤 → (∃𝑥 ∈ 𝐴 𝑧 = 𝐵 ↔ ∃𝑥 ∈ 𝐴 𝑤 = 𝐵))
41	38, 40	elab 3602	. . . . . . . . . . . 12 ⊢ (𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ↔ ∃𝑥 ∈ 𝐴 𝑤 = 𝐵)
42	41	biimpi 215	. . . . . . . . . . 11 ⊢ (𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} → ∃𝑥 ∈ 𝐴 𝑤 = 𝐵)
43	42	adantl 481	. . . . . . . . . 10 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}) → ∃𝑥 ∈ 𝐴 𝑤 = 𝐵)
44		nfra1 3142	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦
45	19, 44	nfan 1903	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥(𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦)
46	20	nfsab 2728	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥 𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}
47	45, 46	nfan 1903	. . . . . . . . . . 11 ⊢ Ⅎ𝑥((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵})
48		nfv 1918	. . . . . . . . . . 11 ⊢ Ⅎ𝑥 𝑤 ≤ 𝑦
49		simp3 1136	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → 𝑤 = 𝐵)
50		simp1r 1196	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦)
51		simp2 1135	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → 𝑥 ∈ 𝐴)
52		rspa 3130	. . . . . . . . . . . . . . 15 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦 ∧ 𝑥 ∈ 𝐴) → 𝐵 ≤ 𝑦)
53	50, 51, 52	syl2anc 583	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → 𝐵 ≤ 𝑦)
54	49, 53	eqbrtrd 5092	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → 𝑤 ≤ 𝑦)
55	54	3exp 1117	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) → (𝑥 ∈ 𝐴 → (𝑤 = 𝐵 → 𝑤 ≤ 𝑦)))
56	55	adantr 480	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}) → (𝑥 ∈ 𝐴 → (𝑤 = 𝐵 → 𝑤 ≤ 𝑦)))
57	47, 48, 56	rexlimd 3245	. . . . . . . . . 10 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}) → (∃𝑥 ∈ 𝐴 𝑤 = 𝐵 → 𝑤 ≤ 𝑦))
58	43, 57	mpd 15	. . . . . . . . 9 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}) → 𝑤 ≤ 𝑦)
59	58	ralrimiva 3107	. . . . . . . 8 ⊢ ((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) → ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦)
60	59	3adant2 1129	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) → ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦)
61	60	3exp 1117	. . . . . 6 ⊢ (𝜑 → (𝑦 ∈ ℝ → (∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦 → ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦)))
62	61	reximdvai 3199	. . . . 5 ⊢ (𝜑 → (∃𝑦 ∈ ℝ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦 → ∃𝑦 ∈ ℝ ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦))
63	37, 62	mpd 15	. . . 4 ⊢ (𝜑 → ∃𝑦 ∈ ℝ ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦)
64		suprcl 11865	. . . 4 ⊢ (({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ⊆ ℝ ∧ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ≠ ∅ ∧ ∃𝑦 ∈ ℝ ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦) → sup({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}, ℝ, < ) ∈ ℝ)
65	13, 36, 63, 64	syl3anc 1369	. . 3 ⊢ (𝜑 → sup({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}, ℝ, < ) ∈ ℝ)
66	1, 65	eqeltrid 2843	. 2 ⊢ (𝜑 → 𝐶 ∈ ℝ)
67	13	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ⊆ ℝ)
68	30, 35	sylibr 233	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ≠ ∅)
69	63	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∃𝑦 ∈ ℝ ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦)
70		elabrexg 42478	. . . . . 6 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝐵 ∈ ℝ) → 𝐵 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵})
71	22, 2, 70	syl2anc 583	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵})
72		suprub 11866	. . . . 5 ⊢ ((({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ⊆ ℝ ∧ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ≠ ∅ ∧ ∃𝑦 ∈ ℝ ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦) ∧ 𝐵 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}) → 𝐵 ≤ sup({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}, ℝ, < ))
73	67, 68, 69, 71, 72	syl31anc 1371	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ≤ sup({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}, ℝ, < ))
74	73, 1	breqtrrdi 5112	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ≤ 𝐶)
75	74	ralrimiva 3107	. 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝐶)
76	66, 75	jca 511	1 ⊢ (𝜑 → (𝐶 ∈ ℝ ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝐶))

Syntax hints:   → wi 4   ∧ wa 395   ∧ w3a 1085   = wceq 1539  ∃wex 1783   ∈ wcel 2108  {cab 2715   ≠ wne 2942  ∀wral 3063  ∃wrex 3064  Vcvv 3422   ⊆ wss 3883  ∅c0 4253   class class class wbr 5070  supcsup 9129  ℝcr 10801   < clt 10940   ≤ cle 10941

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347  ax-un 7566  ax-resscn 10859  ax-1cn 10860  ax-icn 10861  ax-addcl 10862  ax-addrcl 10863  ax-mulcl 10864  ax-mulrcl 10865  ax-mulcom 10866  ax-addass 10867  ax-mulass 10868  ax-distr 10869  ax-i2m1 10870  ax-1ne0 10871  ax-1rid 10872  ax-rnegex 10873  ax-rrecex 10874  ax-cnre 10875  ax-pre-lttri 10876  ax-pre-lttrn 10877  ax-pre-ltadd 10878  ax-pre-mulgt0 10879  ax-pre-sup 10880

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-nel 3049  df-ral 3068  df-rex 3069  df-reu 3070  df-rmo 3071  df-rab 3072  df-v 3424  df-sbc 3712  df-csb 3829  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-op 4565  df-uni 4837  df-br 5071  df-opab 5133  df-mpt 5154  df-id 5480  df-po 5494  df-so 5495  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-riota 7212  df-ov 7258  df-oprab 7259  df-mpo 7260  df-er 8456  df-en 8692  df-dom 8693  df-sdom 8694  df-sup 9131  df-pnf 10942  df-mnf 10943  df-xr 10944  df-ltxr 10945  df-le 10946  df-sub 11137  df-neg 11138

This theorem is referenced by:  upbdrech2  42737