Theorem upbdrech 39519

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 2966	. . . . 5 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ)
4		nfra1 2941	. . . . . . 7 ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ
5		nfv 1843	. . . . . . 7 ⊢ Ⅎ𝑥 𝑧 ∈ ℝ
6		simp3 1063	. . . . . . . . 9 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ ∧ 𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵) → 𝑧 = 𝐵)
7		rspa 2930	. . . . . . . . . 10 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℝ)
8	7	3adant3 1081	. . . . . . . . 9 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ ∧ 𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵) → 𝐵 ∈ ℝ)
9	6, 8	eqeltrd 2701	. . . . . . . 8 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ ∧ 𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵) → 𝑧 ∈ ℝ)
10	9	3exp 1264	. . . . . . 7 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ → (𝑥 ∈ 𝐴 → (𝑧 = 𝐵 → 𝑧 ∈ ℝ)))
11	4, 5, 10	rexlimd 3026	. . . . . 6 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ ℝ → (∃𝑥 ∈ 𝐴 𝑧 = 𝐵 → 𝑧 ∈ ℝ))
12	11	abssdv 3676	. . . . 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 2623	. . . . . . . 8 ⊢ (𝑥 ∈ 𝐴 → 𝐵 = 𝐵)
16	15	rgen 2922	. . . . . . 7 ⊢ ∀𝑥 ∈ 𝐴 𝐵 = 𝐵
17		r19.2z 4060	. . . . . . 7 ⊢ ((𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 𝐵 = 𝐵) → ∃𝑥 ∈ 𝐴 𝐵 = 𝐵)
18	14, 16, 17	sylancl 694	. . . . . 6 ⊢ (𝜑 → ∃𝑥 ∈ 𝐴 𝐵 = 𝐵)
19		nfv 1843	. . . . . . 7 ⊢ Ⅎ𝑥𝜑
20		nfre1 3005	. . . . . . . 8 ⊢ Ⅎ𝑥∃𝑥 ∈ 𝐴 𝑧 = 𝐵
21	20	nfex 2154	. . . . . . 7 ⊢ Ⅎ𝑥∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵
22		simpr 477	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ 𝐴)
23		elex 3212	. . . . . . . . . . . . 13 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ V)
24	2, 23	syl 17	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ V)
25		isset 3207	. . . . . . . . . . . 12 ⊢ (𝐵 ∈ V ↔ ∃𝑧 𝑧 = 𝐵)
26	24, 25	sylib 208	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∃𝑧 𝑧 = 𝐵)
27		rspe 3003	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ 𝐴 ∧ ∃𝑧 𝑧 = 𝐵) → ∃𝑥 ∈ 𝐴 ∃𝑧 𝑧 = 𝐵)
28	22, 26, 27	syl2anc 693	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∃𝑥 ∈ 𝐴 ∃𝑧 𝑧 = 𝐵)
29		rexcom4 3225	. . . . . . . . . 10 ⊢ (∃𝑥 ∈ 𝐴 ∃𝑧 𝑧 = 𝐵 ↔ ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)
30	28, 29	sylib 208	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)
31	30	3adant3 1081	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴 ∧ 𝐵 = 𝐵) → ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)
32	31	3exp 1264	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ 𝐴 → (𝐵 = 𝐵 → ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)))
33	19, 21, 32	rexlimd 3026	. . . . . 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 3954	. . . . 5 ⊢ ({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ≠ ∅ ↔ ∃𝑧∃𝑥 ∈ 𝐴 𝑧 = 𝐵)
36	34, 35	sylibr 224	. . . 4 ⊢ (𝜑 → {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ≠ ∅)
37		upbdrech.bd	. . . . 5 ⊢ (𝜑 → ∃𝑦 ∈ ℝ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦)
38		vex 3203	. . . . . . . . . . . . 13 ⊢ 𝑤 ∈ V
39		eqeq1 2626	. . . . . . . . . . . . . 14 ⊢ (𝑧 = 𝑤 → (𝑧 = 𝐵 ↔ 𝑤 = 𝐵))
40	39	rexbidv 3052	. . . . . . . . . . . . 13 ⊢ (𝑧 = 𝑤 → (∃𝑥 ∈ 𝐴 𝑧 = 𝐵 ↔ ∃𝑥 ∈ 𝐴 𝑤 = 𝐵))
41	38, 40	elab 3350	. . . . . . . . . . . 12 ⊢ (𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ↔ ∃𝑥 ∈ 𝐴 𝑤 = 𝐵)
42	41	biimpi 206	. . . . . . . . . . 11 ⊢ (𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} → ∃𝑥 ∈ 𝐴 𝑤 = 𝐵)
43	42	adantl 482	. . . . . . . . . 10 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}) → ∃𝑥 ∈ 𝐴 𝑤 = 𝐵)
44		nfra1 2941	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦
45	19, 44	nfan 1828	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥(𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦)
46	20	nfsab 2614	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥 𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}
47	45, 46	nfan 1828	. . . . . . . . . . 11 ⊢ Ⅎ𝑥((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵})
48		nfv 1843	. . . . . . . . . . 11 ⊢ Ⅎ𝑥 𝑤 ≤ 𝑦
49		simp3 1063	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → 𝑤 = 𝐵)
50		simp1r 1086	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦)
51		simp2 1062	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → 𝑥 ∈ 𝐴)
52		rspa 2930	. . . . . . . . . . . . . . 15 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦 ∧ 𝑥 ∈ 𝐴) → 𝐵 ≤ 𝑦)
53	50, 51, 52	syl2anc 693	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → 𝐵 ≤ 𝑦)
54	49, 53	eqbrtrd 4675	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑥 ∈ 𝐴 ∧ 𝑤 = 𝐵) → 𝑤 ≤ 𝑦)
55	54	3exp 1264	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) → (𝑥 ∈ 𝐴 → (𝑤 = 𝐵 → 𝑤 ≤ 𝑦)))
56	55	adantr 481	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) ∧ 𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}) → (𝑥 ∈ 𝐴 → (𝑤 = 𝐵 → 𝑤 ≤ 𝑦)))
57	47, 48, 56	rexlimd 3026	. . . . . . . . . 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 2966	. . . . . . . 8 ⊢ ((𝜑 ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) → ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦)
60	59	3adant2 1080	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦) → ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦)
61	60	3exp 1264	. . . . . 6 ⊢ (𝜑 → (𝑦 ∈ ℝ → (∀𝑥 ∈ 𝐴 𝐵 ≤ 𝑦 → ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦)))
62	61	reximdvai 3015	. . . . 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 10983	. . . 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 1326	. . 3 ⊢ (𝜑 → sup({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}, ℝ, < ) ∈ ℝ)
66	1, 65	syl5eqel 2705	. 2 ⊢ (𝜑 → 𝐶 ∈ ℝ)
67	13	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ⊆ ℝ)
68	30, 35	sylibr 224	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵} ≠ ∅)
69	63	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∃𝑦 ∈ ℝ ∀𝑤 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}𝑤 ≤ 𝑦)
70		elabrexg 39206	. . . . . 6 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝐵 ∈ ℝ) → 𝐵 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵})
71	22, 2, 70	syl2anc 693	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ {𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵})
72		suprub 10984	. . . . 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 1329	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ≤ sup({𝑧 ∣ ∃𝑥 ∈ 𝐴 𝑧 = 𝐵}, ℝ, < ))
74	73, 1	syl6breqr 4695	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ≤ 𝐶)
75	74	ralrimiva 2966	. 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝐶)
76	66, 75	jca 554	1 ⊢ (𝜑 → (𝐶 ∈ ℝ ∧ ∀𝑥 ∈ 𝐴 𝐵 ≤ 𝐶))

Syntax hints:   → wi 4   ∧ wa 384   ∧ w3a 1037   = wceq 1483  ∃wex 1704   ∈ wcel 1990  {cab 2608   ≠ wne 2794  ∀wral 2912  ∃wrex 2913  Vcvv 3200   ⊆ wss 3574  ∅c0 3915   class class class wbr 4653  supcsup 8346  ℝcr 9935   < clt 10074   ≤ cle 10075

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013  ax-pre-sup 10014

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-po 5035  df-so 5036  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-sup 8348  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269

This theorem is referenced by:  upbdrech2  39522