Theorem upbdrech 38460

Description: Choice of an upper bound for a non empty 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 2949	. . . . 5 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ)
4		nfra1 2925	. . . . . . 7 ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ
5		nfv 1830	. . . . . . 7 ⊢ Ⅎ𝑥 𝑧 ∈ ℝ
6		simp3 1056	. . . . . . . . 9 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ ∧ 𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵) → 𝑧 = 𝐵)
7		rspa 2914	. . . . . . . . . 10 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℝ)
8	7	3adant3 1074	. . . . . . . . 9 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ ∧ 𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵) → 𝐵 ∈ ℝ)
9	6, 8	eqeltrd 2688	. . . . . . . 8 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ ∧ 𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵) → 𝑧 ∈ ℝ)
10	9	3exp 1256	. . . . . . 7 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ → (𝑥 ∈ 𝐴 → (𝑧 = 𝐵 → 𝑧 ∈ ℝ)))
11	4, 5, 10	rexlimd 3008	. . . . . 6 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ → (∃𝑥 ∈ 𝐴 𝑧 = 𝐵 → 𝑧 ∈ ℝ))
12	11	abssdv 3639	. . . . 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 2611	. . . . . . . 8 ⊢ (𝑥 ∈ 𝐴 → 𝐵 = 𝐵)
16	15	rgen 2906	. . . . . . 7 ⊢ ∀𝑥 ∈ 𝐴 𝐵 = 𝐵
17		r19.2z 4012	. . . . . . 7 ⊢ ((𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 𝐵 = 𝐵) → ∃𝑥 ∈ 𝐴 𝐵 = 𝐵)
18	14, 16, 17	sylancl 693	. . . . . 6 ⊢ (𝜑 → ∃𝑥 ∈ 𝐴 𝐵 = 𝐵)
19		nfv 1830	. . . . . . 7 ⊢ Ⅎ𝑥𝜑
20		nfre1 2988	. . . . . . . 8 ⊢ Ⅎ𝑥∃𝑥 ∈ 𝐴 𝑧 = 𝐵
21	20	nfex 2140	. . . . . . 7 ⊢ Ⅎ𝑥∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵
22		simpr 476	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ 𝐴)
23		elex 3185	. . . . . . . . . . . . 13 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ V)
24	2, 23	syl 17	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ V)
25		isset 3180	. . . . . . . . . . . 12 ⊢ (𝐵 ∈ V ↔ ∃𝑧 𝑧 = 𝐵)
26	24, 25	sylib 207	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∃𝑧 𝑧 = 𝐵)
27		rspe 2986	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ 𝐴 ∧ ∃𝑧 𝑧 = 𝐵) → ∃𝑥 ∈ 𝐴 ∃𝑧 𝑧 = 𝐵)
28	22, 26, 27	syl2anc 691	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∃𝑥 ∈ 𝐴 ∃𝑧 𝑧 = 𝐵)
29		rexcom4 3198	. . . . . . . . . 10 ⊢ (∃𝑥 ∈ 𝐴 ∃𝑧 𝑧 = 𝐵 ↔ ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)
30	28, 29	sylib 207	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)
31	30	3adant3 1074	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴 ∧ 𝐵 = 𝐵) → ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)
32	31	3exp 1256	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ 𝐴 → (𝐵 = 𝐵 → ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)))
33	19, 21, 32	rexlimd 3008	. . . . . 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 3908	. . . . 5 ⊢ ({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ≠ ∅ ↔ ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)
36	34, 35	sylibr 223	. . . 4 ⊢ (𝜑 → {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ≠ ∅)
37		upbdrech.bd	. . . . 5 ⊢ (𝜑 → ∃𝑦 ∈ ℝ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦)
38		vex 3176	. . . . . . . . . . . . 13 ⊢ 𝑤 ∈ V
39		eqeq1 2614	. . . . . . . . . . . . . 14 ⊢ (𝑧 = 𝑤 → (𝑧 = 𝐵 ↔ 𝑤 = 𝐵))
40	39	rexbidv 3034	. . . . . . . . . . . . 13 ⊢ (𝑧 = 𝑤 → (∃𝑥 ∈ 𝐴 𝑧 = 𝐵 ↔ ∃𝑥 ∈ 𝐴 𝑤 = 𝐵))
41	38, 40	elab 3319	. . . . . . . . . . . 12 ⊢ (𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ↔ ∃𝑥 ∈ 𝐴 𝑤 = 𝐵)
42	41	biimpi 205	. . . . . . . . . . 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 2925	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦
45	19, 44	nfan 1816	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥(𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦)
46	20	nfsab 2602	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥 𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}
47	45, 46	nfan 1816	. . . . . . . . . . 11 ⊢ Ⅎ𝑥((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵})
48		nfv 1830	. . . . . . . . . . 11 ⊢ Ⅎ𝑥 𝑤 ≤ 𝑦
49		simp3 1056	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → 𝑤 = 𝐵)
50		simp1r 1079	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦)
51		simp2 1055	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → 𝑥 ∈ 𝐴)
52		rspa 2914	. . . . . . . . . . . . . . 15 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦 ∧ 𝑥 ∈ 𝐴) → 𝐵 ≤ 𝑦)
53	50, 51, 52	syl2anc 691	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → 𝐵 ≤ 𝑦)
54	49, 53	eqbrtrd 4605	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → 𝑤 ≤ 𝑦)
55	54	3exp 1256	. . . . . . . . . . . 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 3008	. . . . . . . . . 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 2949	. . . . . . . 8 ⊢ ((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) → ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦)
60	59	3adant2 1073	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) → ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦)
61	60	3exp 1256	. . . . . 6 ⊢ (𝜑 → (𝑦 ∈ ℝ → (∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦 → ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦)))
62	61	reximdvai 2998	. . . . 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 10862	. . . 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 1318	. . 3 ⊢ (𝜑 → sup({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}, ℝ, < ) ∈ ℝ)
66	1, 65	syl5eqel 2692	. 2 ⊢ (𝜑 → 𝐶 ∈ ℝ)
67	13	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ⊆ ℝ)
68	30, 35	sylibr 223	. . . . 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 38229	. . . . . 6 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝐵 ∈ ℝ) → 𝐵 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵})
71	22, 2, 70	syl2anc 691	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵})
72		suprub 10863	. . . . 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 1321	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ≤ sup({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}, ℝ, < ))
74	73, 1	syl6breqr 4625	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ≤ 𝐶)
75	74	ralrimiva 2949	. 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝐶)
76	66, 75	jca 553	1 ⊢ (𝜑 → (𝐶 ∈ ℝ ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝐶))

Syntax hints:   → wi 4   ∧ wa 383   ∧ w3a 1031   = wceq 1475  ∃wex 1695   ∈ wcel 1977  {cab 2596   ≠ wne 2780  ∀wral 2896  ∃wrex 2897  Vcvv 3173   ⊆ wss 3540  ∅c0 3874   class class class wbr 4583  supcsup 8229  ℝcr 9814   < clt 9953   ≤ cle 9954

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892  ax-pre-sup 9893

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-br 4584  df-opab 4644  df-mpt 4645  df-id 4953  df-po 4959  df-so 4960  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-er 7629  df-en 7842  df-dom 7843  df-sdom 7844  df-sup 8231  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148

This theorem is referenced by:  upbdrech2  38463