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Theorem bndth 24474

Description: The Boundedness Theorem. A continuous function from a compact topological space to the reals is bounded (above). (Boundedness below is obtained by applying this theorem to -𝐹.) (Contributed by Mario Carneiro, 12-Aug-2014.)

**Hypotheses**
Ref	Expression
bndth.1	⊢ 𝑋 = ∪ 𝐽
bndth.2	⊢ 𝐾 = (topGen‘ran (,))
bndth.3	⊢ (𝜑 → 𝐽 ∈ Comp)
bndth.4	⊢ (𝜑 → 𝐹 ∈ (𝐽 Cn 𝐾))

**Assertion**
Ref	Expression
bndth	⊢ (𝜑 → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝑋 (𝐹‘𝑦) ≤ 𝑥)

Distinct variable groups: 𝑥,𝑦,𝐹 𝑦,𝐾 𝜑,𝑥,𝑦 𝑥,𝑋,𝑦 𝑥,𝐽,𝑦 Allowed substitution hint: 𝐾(𝑥)

Proof of Theorem bndth Dummy variables 𝑣 𝑢 𝑧 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		bndth.4	. . . . 5 ⊢ (𝜑 → 𝐹 ∈ (𝐽 Cn 𝐾))
2		bndth.1	. . . . . 6 ⊢ 𝑋 = ∪ 𝐽
3		bndth.2	. . . . . . . 8 ⊢ 𝐾 = (topGen‘ran (,))
4		retopon 24280	. . . . . . . 8 ⊢ (topGen‘ran (,)) ∈ (TopOn‘ℝ)
5	3, 4	eqeltri 2830	. . . . . . 7 ⊢ 𝐾 ∈ (TopOn‘ℝ)
6	5	toponunii 22418	. . . . . 6 ⊢ ℝ = ∪ 𝐾
7	2, 6	cnf 22750	. . . . 5 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐹:𝑋⟶ℝ)
8	1, 7	syl 17	. . . 4 ⊢ (𝜑 → 𝐹:𝑋⟶ℝ)
9	8	frnd 6726	. . 3 ⊢ (𝜑 → ran 𝐹 ⊆ ℝ)
10		unieq 4920	. . . . . . 7 ⊢ (𝑢 = ((,) “ ({-∞} × ℝ)) → ∪ 𝑢 = ∪ ((,) “ ({-∞} × ℝ)))
11		imassrn 6071	. . . . . . . . . 10 ⊢ ((,) “ ({-∞} × ℝ)) ⊆ ran (,)
12	11	unissi 4918	. . . . . . . . 9 ⊢ ∪ ((,) “ ({-∞} × ℝ)) ⊆ ∪ ran (,)
13		unirnioo 13426	. . . . . . . . 9 ⊢ ℝ = ∪ ran (,)
14	12, 13	sseqtrri 4020	. . . . . . . 8 ⊢ ∪ ((,) “ ({-∞} × ℝ)) ⊆ ℝ
15		id 22	. . . . . . . . . . 11 ⊢ (𝑥 ∈ ℝ → 𝑥 ∈ ℝ)
16		ltp1 12054	. . . . . . . . . . 11 ⊢ (𝑥 ∈ ℝ → 𝑥 < (𝑥 + 1))
17		ressxr 11258	. . . . . . . . . . . . 13 ⊢ ℝ ⊆ ℝ^*
18		peano2re 11387	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ ℝ → (𝑥 + 1) ∈ ℝ)
19	17, 18	sselid 3981	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ ℝ → (𝑥 + 1) ∈ ℝ^*)
20		elioomnf 13421	. . . . . . . . . . . 12 ⊢ ((𝑥 + 1) ∈ ℝ^* → (𝑥 ∈ (-∞(,)(𝑥 + 1)) ↔ (𝑥 ∈ ℝ ∧ 𝑥 < (𝑥 + 1))))
21	19, 20	syl 17	. . . . . . . . . . 11 ⊢ (𝑥 ∈ ℝ → (𝑥 ∈ (-∞(,)(𝑥 + 1)) ↔ (𝑥 ∈ ℝ ∧ 𝑥 < (𝑥 + 1))))
22	15, 16, 21	mpbir2and 712	. . . . . . . . . 10 ⊢ (𝑥 ∈ ℝ → 𝑥 ∈ (-∞(,)(𝑥 + 1)))
23		df-ov 7412	. . . . . . . . . . 11 ⊢ (-∞(,)(𝑥 + 1)) = ((,)‘⟨-∞, (𝑥 + 1)⟩)
24		mnfxr 11271	. . . . . . . . . . . . . . 15 ⊢ -∞ ∈ ℝ^*
25	24	elexi 3494	. . . . . . . . . . . . . 14 ⊢ -∞ ∈ V
26	25	snid 4665	. . . . . . . . . . . . 13 ⊢ -∞ ∈ {-∞}
27		opelxpi 5714	. . . . . . . . . . . . 13 ⊢ ((-∞ ∈ {-∞} ∧ (𝑥 + 1) ∈ ℝ) → ⟨-∞, (𝑥 + 1)⟩ ∈ ({-∞} × ℝ))
28	26, 18, 27	sylancr 588	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ ℝ → ⟨-∞, (𝑥 + 1)⟩ ∈ ({-∞} × ℝ))
29		ioof 13424	. . . . . . . . . . . . . 14 ⊢ (,):(ℝ^* × ℝ^*)⟶𝒫 ℝ
30		ffun 6721	. . . . . . . . . . . . . 14 ⊢ ((,):(ℝ^* × ℝ^*)⟶𝒫 ℝ → Fun (,))
31	29, 30	ax-mp 5	. . . . . . . . . . . . 13 ⊢ Fun (,)
32		snssi 4812	. . . . . . . . . . . . . . . 16 ⊢ (-∞ ∈ ℝ^* → {-∞} ⊆ ℝ^*)
33	24, 32	ax-mp 5	. . . . . . . . . . . . . . 15 ⊢ {-∞} ⊆ ℝ^*
34		xpss12 5692	. . . . . . . . . . . . . . 15 ⊢ (({-∞} ⊆ ℝ^* ∧ ℝ ⊆ ℝ^) → ({-∞} × ℝ) ⊆ (ℝ^ × ℝ^*))
35	33, 17, 34	mp2an 691	. . . . . . . . . . . . . 14 ⊢ ({-∞} × ℝ) ⊆ (ℝ^* × ℝ^*)
36	29	fdmi 6730	. . . . . . . . . . . . . 14 ⊢ dom (,) = (ℝ^* × ℝ^*)
37	35, 36	sseqtrri 4020	. . . . . . . . . . . . 13 ⊢ ({-∞} × ℝ) ⊆ dom (,)
38		funfvima2 7233	. . . . . . . . . . . . 13 ⊢ ((Fun (,) ∧ ({-∞} × ℝ) ⊆ dom (,)) → (⟨-∞, (𝑥 + 1)⟩ ∈ ({-∞} × ℝ) → ((,)‘⟨-∞, (𝑥 + 1)⟩) ∈ ((,) “ ({-∞} × ℝ))))
39	31, 37, 38	mp2an 691	. . . . . . . . . . . 12 ⊢ (⟨-∞, (𝑥 + 1)⟩ ∈ ({-∞} × ℝ) → ((,)‘⟨-∞, (𝑥 + 1)⟩) ∈ ((,) “ ({-∞} × ℝ)))
40	28, 39	syl 17	. . . . . . . . . . 11 ⊢ (𝑥 ∈ ℝ → ((,)‘⟨-∞, (𝑥 + 1)⟩) ∈ ((,) “ ({-∞} × ℝ)))
41	23, 40	eqeltrid 2838	. . . . . . . . . 10 ⊢ (𝑥 ∈ ℝ → (-∞(,)(𝑥 + 1)) ∈ ((,) “ ({-∞} × ℝ)))
42		elunii 4914	. . . . . . . . . 10 ⊢ ((𝑥 ∈ (-∞(,)(𝑥 + 1)) ∧ (-∞(,)(𝑥 + 1)) ∈ ((,) “ ({-∞} × ℝ))) → 𝑥 ∈ ∪ ((,) “ ({-∞} × ℝ)))
43	22, 41, 42	syl2anc 585	. . . . . . . . 9 ⊢ (𝑥 ∈ ℝ → 𝑥 ∈ ∪ ((,) “ ({-∞} × ℝ)))
44	43	ssriv 3987	. . . . . . . 8 ⊢ ℝ ⊆ ∪ ((,) “ ({-∞} × ℝ))
45	14, 44	eqssi 3999	. . . . . . 7 ⊢ ∪ ((,) “ ({-∞} × ℝ)) = ℝ
46	10, 45	eqtrdi 2789	. . . . . 6 ⊢ (𝑢 = ((,) “ ({-∞} × ℝ)) → ∪ 𝑢 = ℝ)
47	46	sseq2d 4015	. . . . 5 ⊢ (𝑢 = ((,) “ ({-∞} × ℝ)) → (ran 𝐹 ⊆ ∪ 𝑢 ↔ ran 𝐹 ⊆ ℝ))
48		pweq 4617	. . . . . . 7 ⊢ (𝑢 = ((,) “ ({-∞} × ℝ)) → 𝒫 𝑢 = 𝒫 ((,) “ ({-∞} × ℝ)))
49	48	ineq1d 4212	. . . . . 6 ⊢ (𝑢 = ((,) “ ({-∞} × ℝ)) → (𝒫 𝑢 ∩ Fin) = (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin))
50	49	rexeqdv 3327	. . . . 5 ⊢ (𝑢 = ((,) “ ({-∞} × ℝ)) → (∃𝑣 ∈ (𝒫 𝑢 ∩ Fin)ran 𝐹 ⊆ ∪ 𝑣 ↔ ∃𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)ran 𝐹 ⊆ ∪ 𝑣))
51	47, 50	imbi12d 345	. . . 4 ⊢ (𝑢 = ((,) “ ({-∞} × ℝ)) → ((ran 𝐹 ⊆ ∪ 𝑢 → ∃𝑣 ∈ (𝒫 𝑢 ∩ Fin)ran 𝐹 ⊆ ∪ 𝑣) ↔ (ran 𝐹 ⊆ ℝ → ∃𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)ran 𝐹 ⊆ ∪ 𝑣)))
52		bndth.3	. . . . . 6 ⊢ (𝜑 → 𝐽 ∈ Comp)
53		rncmp 22900	. . . . . 6 ⊢ ((𝐽 ∈ Comp ∧ 𝐹 ∈ (𝐽 Cn 𝐾)) → (𝐾 ↾_t ran 𝐹) ∈ Comp)
54	52, 1, 53	syl2anc 585	. . . . 5 ⊢ (𝜑 → (𝐾 ↾_t ran 𝐹) ∈ Comp)
55		retop 24278	. . . . . . 7 ⊢ (topGen‘ran (,)) ∈ Top
56	3, 55	eqeltri 2830	. . . . . 6 ⊢ 𝐾 ∈ Top
57	6	cmpsub 22904	. . . . . 6 ⊢ ((𝐾 ∈ Top ∧ ran 𝐹 ⊆ ℝ) → ((𝐾 ↾_t ran 𝐹) ∈ Comp ↔ ∀𝑢 ∈ 𝒫 𝐾(ran 𝐹 ⊆ ∪ 𝑢 → ∃𝑣 ∈ (𝒫 𝑢 ∩ Fin)ran 𝐹 ⊆ ∪ 𝑣)))
58	56, 9, 57	sylancr 588	. . . . 5 ⊢ (𝜑 → ((𝐾 ↾_t ran 𝐹) ∈ Comp ↔ ∀𝑢 ∈ 𝒫 𝐾(ran 𝐹 ⊆ ∪ 𝑢 → ∃𝑣 ∈ (𝒫 𝑢 ∩ Fin)ran 𝐹 ⊆ ∪ 𝑣)))
59	54, 58	mpbid 231	. . . 4 ⊢ (𝜑 → ∀𝑢 ∈ 𝒫 𝐾(ran 𝐹 ⊆ ∪ 𝑢 → ∃𝑣 ∈ (𝒫 𝑢 ∩ Fin)ran 𝐹 ⊆ ∪ 𝑣))
60		retopbas 24277	. . . . . . . . 9 ⊢ ran (,) ∈ TopBases
61		bastg 22469	. . . . . . . . 9 ⊢ (ran (,) ∈ TopBases → ran (,) ⊆ (topGen‘ran (,)))
62	60, 61	ax-mp 5	. . . . . . . 8 ⊢ ran (,) ⊆ (topGen‘ran (,))
63	62, 3	sseqtrri 4020	. . . . . . 7 ⊢ ran (,) ⊆ 𝐾
64	11, 63	sstri 3992	. . . . . 6 ⊢ ((,) “ ({-∞} × ℝ)) ⊆ 𝐾
65	56, 64	elpwi2 5347	. . . . 5 ⊢ ((,) “ ({-∞} × ℝ)) ∈ 𝒫 𝐾
66	65	a1i 11	. . . 4 ⊢ (𝜑 → ((,) “ ({-∞} × ℝ)) ∈ 𝒫 𝐾)
67	51, 59, 66	rspcdva 3614	. . 3 ⊢ (𝜑 → (ran 𝐹 ⊆ ℝ → ∃𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)ran 𝐹 ⊆ ∪ 𝑣))
68	9, 67	mpd 15	. 2 ⊢ (𝜑 → ∃𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)ran 𝐹 ⊆ ∪ 𝑣)
69		simpr 486	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) → 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin))
70		elin 3965	. . . . . . 7 ⊢ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ↔ (𝑣 ∈ 𝒫 ((,) “ ({-∞} × ℝ)) ∧ 𝑣 ∈ Fin))
71	69, 70	sylib 217	. . . . . 6 ⊢ ((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) → (𝑣 ∈ 𝒫 ((,) “ ({-∞} × ℝ)) ∧ 𝑣 ∈ Fin))
72	71	adantrr 716	. . . . 5 ⊢ ((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) → (𝑣 ∈ 𝒫 ((,) “ ({-∞} × ℝ)) ∧ 𝑣 ∈ Fin))
73	72	simprd 497	. . . 4 ⊢ ((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) → 𝑣 ∈ Fin)
74	71	simpld 496	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) → 𝑣 ∈ 𝒫 ((,) “ ({-∞} × ℝ)))
75	74	elpwid 4612	. . . . . 6 ⊢ ((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) → 𝑣 ⊆ ((,) “ ({-∞} × ℝ)))
76	33	sseli 3979	. . . . . . . . . . . 12 ⊢ (𝑢 ∈ {-∞} → 𝑢 ∈ ℝ^*)
77	76	adantr 482	. . . . . . . . . . 11 ⊢ ((𝑢 ∈ {-∞} ∧ 𝑤 ∈ ℝ) → 𝑢 ∈ ℝ^*)
78	17	sseli 3979	. . . . . . . . . . . 12 ⊢ (𝑤 ∈ ℝ → 𝑤 ∈ ℝ^*)
79	78	adantl 483	. . . . . . . . . . 11 ⊢ ((𝑢 ∈ {-∞} ∧ 𝑤 ∈ ℝ) → 𝑤 ∈ ℝ^*)
80		mnflt 13103	. . . . . . . . . . . . . . 15 ⊢ (𝑤 ∈ ℝ → -∞ < 𝑤)
81		xrltnle 11281	. . . . . . . . . . . . . . . 16 ⊢ ((-∞ ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → (-∞ < 𝑤 ↔ ¬ 𝑤 ≤ -∞))
82	24, 78, 81	sylancr 588	. . . . . . . . . . . . . . 15 ⊢ (𝑤 ∈ ℝ → (-∞ < 𝑤 ↔ ¬ 𝑤 ≤ -∞))
83	80, 82	mpbid 231	. . . . . . . . . . . . . 14 ⊢ (𝑤 ∈ ℝ → ¬ 𝑤 ≤ -∞)
84	83	adantl 483	. . . . . . . . . . . . 13 ⊢ ((𝑢 ∈ {-∞} ∧ 𝑤 ∈ ℝ) → ¬ 𝑤 ≤ -∞)
85		elsni 4646	. . . . . . . . . . . . . . 15 ⊢ (𝑢 ∈ {-∞} → 𝑢 = -∞)
86	85	adantr 482	. . . . . . . . . . . . . 14 ⊢ ((𝑢 ∈ {-∞} ∧ 𝑤 ∈ ℝ) → 𝑢 = -∞)
87	86	breq2d 5161	. . . . . . . . . . . . 13 ⊢ ((𝑢 ∈ {-∞} ∧ 𝑤 ∈ ℝ) → (𝑤 ≤ 𝑢 ↔ 𝑤 ≤ -∞))
88	84, 87	mtbird 325	. . . . . . . . . . . 12 ⊢ ((𝑢 ∈ {-∞} ∧ 𝑤 ∈ ℝ) → ¬ 𝑤 ≤ 𝑢)
89		ioo0 13349	. . . . . . . . . . . . . 14 ⊢ ((𝑢 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → ((𝑢(,)𝑤) = ∅ ↔ 𝑤 ≤ 𝑢))
90	76, 78, 89	syl2an 597	. . . . . . . . . . . . 13 ⊢ ((𝑢 ∈ {-∞} ∧ 𝑤 ∈ ℝ) → ((𝑢(,)𝑤) = ∅ ↔ 𝑤 ≤ 𝑢))
91	90	necon3abid 2978	. . . . . . . . . . . 12 ⊢ ((𝑢 ∈ {-∞} ∧ 𝑤 ∈ ℝ) → ((𝑢(,)𝑤) ≠ ∅ ↔ ¬ 𝑤 ≤ 𝑢))
92	88, 91	mpbird 257	. . . . . . . . . . 11 ⊢ ((𝑢 ∈ {-∞} ∧ 𝑤 ∈ ℝ) → (𝑢(,)𝑤) ≠ ∅)
93		df-ioo 13328	. . . . . . . . . . . 12 ⊢ (,) = (𝑦 ∈ ℝ^, 𝑧 ∈ ℝ^ ↦ {𝑣 ∈ ℝ^* ∣ (𝑦 < 𝑣 ∧ 𝑣 < 𝑧)})
94		idd 24	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → (𝑥 < 𝑤 → 𝑥 < 𝑤))
95		xrltle 13128	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → (𝑥 < 𝑤 → 𝑥 ≤ 𝑤))
96		idd 24	. . . . . . . . . . . 12 ⊢ ((𝑢 ∈ ℝ^* ∧ 𝑥 ∈ ℝ^*) → (𝑢 < 𝑥 → 𝑢 < 𝑥))
97		xrltle 13128	. . . . . . . . . . . 12 ⊢ ((𝑢 ∈ ℝ^* ∧ 𝑥 ∈ ℝ^*) → (𝑢 < 𝑥 → 𝑢 ≤ 𝑥))
98	93, 94, 95, 96, 97	ixxub 13345	. . . . . . . . . . 11 ⊢ ((𝑢 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^* ∧ (𝑢(,)𝑤) ≠ ∅) → sup((𝑢(,)𝑤), ℝ^*, < ) = 𝑤)
99	77, 79, 92, 98	syl3anc 1372	. . . . . . . . . 10 ⊢ ((𝑢 ∈ {-∞} ∧ 𝑤 ∈ ℝ) → sup((𝑢(,)𝑤), ℝ^*, < ) = 𝑤)
100		simpr 486	. . . . . . . . . 10 ⊢ ((𝑢 ∈ {-∞} ∧ 𝑤 ∈ ℝ) → 𝑤 ∈ ℝ)
101	99, 100	eqeltrd 2834	. . . . . . . . 9 ⊢ ((𝑢 ∈ {-∞} ∧ 𝑤 ∈ ℝ) → sup((𝑢(,)𝑤), ℝ^*, < ) ∈ ℝ)
102	101	rgen2 3198	. . . . . . . 8 ⊢ ∀𝑢 ∈ {-∞}∀𝑤 ∈ ℝ sup((𝑢(,)𝑤), ℝ^*, < ) ∈ ℝ
103		fveq2 6892	. . . . . . . . . . . 12 ⊢ (𝑧 = ⟨𝑢, 𝑤⟩ → ((,)‘𝑧) = ((,)‘⟨𝑢, 𝑤⟩))
104		df-ov 7412	. . . . . . . . . . . 12 ⊢ (𝑢(,)𝑤) = ((,)‘⟨𝑢, 𝑤⟩)
105	103, 104	eqtr4di 2791	. . . . . . . . . . 11 ⊢ (𝑧 = ⟨𝑢, 𝑤⟩ → ((,)‘𝑧) = (𝑢(,)𝑤))
106	105	supeq1d 9441	. . . . . . . . . 10 ⊢ (𝑧 = ⟨𝑢, 𝑤⟩ → sup(((,)‘𝑧), ℝ^, < ) = sup((𝑢(,)𝑤), ℝ^, < ))
107	106	eleq1d 2819	. . . . . . . . 9 ⊢ (𝑧 = ⟨𝑢, 𝑤⟩ → (sup(((,)‘𝑧), ℝ^, < ) ∈ ℝ ↔ sup((𝑢(,)𝑤), ℝ^, < ) ∈ ℝ))
108	107	ralxp 5842	. . . . . . . 8 ⊢ (∀𝑧 ∈ ({-∞} × ℝ)sup(((,)‘𝑧), ℝ^, < ) ∈ ℝ ↔ ∀𝑢 ∈ {-∞}∀𝑤 ∈ ℝ sup((𝑢(,)𝑤), ℝ^, < ) ∈ ℝ)
109	102, 108	mpbir 230	. . . . . . 7 ⊢ ∀𝑧 ∈ ({-∞} × ℝ)sup(((,)‘𝑧), ℝ^*, < ) ∈ ℝ
110		ffn 6718	. . . . . . . . 9 ⊢ ((,):(ℝ^* × ℝ^)⟶𝒫 ℝ → (,) Fn (ℝ^ × ℝ^*))
111	29, 110	ax-mp 5	. . . . . . . 8 ⊢ (,) Fn (ℝ^* × ℝ^*)
112		supeq1 9440	. . . . . . . . . 10 ⊢ (𝑤 = ((,)‘𝑧) → sup(𝑤, ℝ^, < ) = sup(((,)‘𝑧), ℝ^, < ))
113	112	eleq1d 2819	. . . . . . . . 9 ⊢ (𝑤 = ((,)‘𝑧) → (sup(𝑤, ℝ^, < ) ∈ ℝ ↔ sup(((,)‘𝑧), ℝ^, < ) ∈ ℝ))
114	113	ralima 7240	. . . . . . . 8 ⊢ (((,) Fn (ℝ^* × ℝ^) ∧ ({-∞} × ℝ) ⊆ (ℝ^ × ℝ^)) → (∀𝑤 ∈ ((,) “ ({-∞} × ℝ))sup(𝑤, ℝ^, < ) ∈ ℝ ↔ ∀𝑧 ∈ ({-∞} × ℝ)sup(((,)‘𝑧), ℝ^*, < ) ∈ ℝ))
115	111, 35, 114	mp2an 691	. . . . . . 7 ⊢ (∀𝑤 ∈ ((,) “ ({-∞} × ℝ))sup(𝑤, ℝ^, < ) ∈ ℝ ↔ ∀𝑧 ∈ ({-∞} × ℝ)sup(((,)‘𝑧), ℝ^, < ) ∈ ℝ)
116	109, 115	mpbir 230	. . . . . 6 ⊢ ∀𝑤 ∈ ((,) “ ({-∞} × ℝ))sup(𝑤, ℝ^*, < ) ∈ ℝ
117		ssralv 4051	. . . . . 6 ⊢ (𝑣 ⊆ ((,) “ ({-∞} × ℝ)) → (∀𝑤 ∈ ((,) “ ({-∞} × ℝ))sup(𝑤, ℝ^, < ) ∈ ℝ → ∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^, < ) ∈ ℝ))
118	75, 116, 117	mpisyl 21	. . . . 5 ⊢ ((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) → ∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^*, < ) ∈ ℝ)
119	118	adantrr 716	. . . 4 ⊢ ((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) → ∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^*, < ) ∈ ℝ)
120		fimaxre3 12160	. . . 4 ⊢ ((𝑣 ∈ Fin ∧ ∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^, < ) ∈ ℝ) → ∃𝑥 ∈ ℝ ∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^, < ) ≤ 𝑥)
121	73, 119, 120	syl2anc 585	. . 3 ⊢ ((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) → ∃𝑥 ∈ ℝ ∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^*, < ) ≤ 𝑥)
122		simplrr 777	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) ∧ 𝑥 ∈ ℝ) → ran 𝐹 ⊆ ∪ 𝑣)
123	122	sselda 3983	. . . . . . 7 ⊢ ((((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) ∧ 𝑥 ∈ ℝ) ∧ 𝑧 ∈ ran 𝐹) → 𝑧 ∈ ∪ 𝑣)
124		eluni2 4913	. . . . . . . 8 ⊢ (𝑧 ∈ ∪ 𝑣 ↔ ∃𝑤 ∈ 𝑣 𝑧 ∈ 𝑤)
125		r19.29r 3117	. . . . . . . . . 10 ⊢ ((∃𝑤 ∈ 𝑣 𝑧 ∈ 𝑤 ∧ ∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^, < ) ≤ 𝑥) → ∃𝑤 ∈ 𝑣 (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^, < ) ≤ 𝑥))
126		sspwuni 5104	. . . . . . . . . . . . . . . . . . 19 ⊢ (((,) “ ({-∞} × ℝ)) ⊆ 𝒫 ℝ ↔ ∪ ((,) “ ({-∞} × ℝ)) ⊆ ℝ)
127	14, 126	mpbir 230	. . . . . . . . . . . . . . . . . 18 ⊢ ((,) “ ({-∞} × ℝ)) ⊆ 𝒫 ℝ
128	75	3ad2ant1 1134	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣) ∧ (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^*, < ) ≤ 𝑥)) → 𝑣 ⊆ ((,) “ ({-∞} × ℝ)))
129		simp2r 1201	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣) ∧ (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^*, < ) ≤ 𝑥)) → 𝑤 ∈ 𝑣)
130	128, 129	sseldd 3984	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣) ∧ (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^*, < ) ≤ 𝑥)) → 𝑤 ∈ ((,) “ ({-∞} × ℝ)))
131	127, 130	sselid 3981	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣) ∧ (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^*, < ) ≤ 𝑥)) → 𝑤 ∈ 𝒫 ℝ)
132	131	elpwid 4612	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣) ∧ (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^*, < ) ≤ 𝑥)) → 𝑤 ⊆ ℝ)
133		simp3l 1202	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣) ∧ (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^*, < ) ≤ 𝑥)) → 𝑧 ∈ 𝑤)
134	132, 133	sseldd 3984	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣) ∧ (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^*, < ) ≤ 𝑥)) → 𝑧 ∈ ℝ)
135	118	r19.21bi 3249	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ 𝑤 ∈ 𝑣) → sup(𝑤, ℝ^*, < ) ∈ ℝ)
136	135	adantrl 715	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣)) → sup(𝑤, ℝ^*, < ) ∈ ℝ)
137	136	3adant3 1133	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣) ∧ (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^, < ) ≤ 𝑥)) → sup(𝑤, ℝ^, < ) ∈ ℝ)
138		simp2l 1200	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣) ∧ (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^*, < ) ≤ 𝑥)) → 𝑥 ∈ ℝ)
139	132, 17	sstrdi 3995	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣) ∧ (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^, < ) ≤ 𝑥)) → 𝑤 ⊆ ℝ^)
140		supxrub 13303	. . . . . . . . . . . . . . . 16 ⊢ ((𝑤 ⊆ ℝ^* ∧ 𝑧 ∈ 𝑤) → 𝑧 ≤ sup(𝑤, ℝ^*, < ))
141	139, 133, 140	syl2anc 585	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣) ∧ (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^, < ) ≤ 𝑥)) → 𝑧 ≤ sup(𝑤, ℝ^, < ))
142		simp3r 1203	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣) ∧ (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^, < ) ≤ 𝑥)) → sup(𝑤, ℝ^, < ) ≤ 𝑥)
143	134, 137, 138, 141, 142	letrd 11371	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣) ∧ (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^*, < ) ≤ 𝑥)) → 𝑧 ≤ 𝑥)
144	143	3expia 1122	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ (𝑥 ∈ ℝ ∧ 𝑤 ∈ 𝑣)) → ((𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^*, < ) ≤ 𝑥) → 𝑧 ≤ 𝑥))
145	144	anassrs 469	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ 𝑥 ∈ ℝ) ∧ 𝑤 ∈ 𝑣) → ((𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^*, < ) ≤ 𝑥) → 𝑧 ≤ 𝑥))
146	145	rexlimdva 3156	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin)) ∧ 𝑥 ∈ ℝ) → (∃𝑤 ∈ 𝑣 (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^*, < ) ≤ 𝑥) → 𝑧 ≤ 𝑥))
147	146	adantlrr 720	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) ∧ 𝑥 ∈ ℝ) → (∃𝑤 ∈ 𝑣 (𝑧 ∈ 𝑤 ∧ sup(𝑤, ℝ^*, < ) ≤ 𝑥) → 𝑧 ≤ 𝑥))
148	125, 147	syl5 34	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) ∧ 𝑥 ∈ ℝ) → ((∃𝑤 ∈ 𝑣 𝑧 ∈ 𝑤 ∧ ∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^*, < ) ≤ 𝑥) → 𝑧 ≤ 𝑥))
149	148	expdimp 454	. . . . . . . 8 ⊢ ((((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) ∧ 𝑥 ∈ ℝ) ∧ ∃𝑤 ∈ 𝑣 𝑧 ∈ 𝑤) → (∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^*, < ) ≤ 𝑥 → 𝑧 ≤ 𝑥))
150	124, 149	sylan2b 595	. . . . . . 7 ⊢ ((((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) ∧ 𝑥 ∈ ℝ) ∧ 𝑧 ∈ ∪ 𝑣) → (∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^*, < ) ≤ 𝑥 → 𝑧 ≤ 𝑥))
151	123, 150	syldan 592	. . . . . 6 ⊢ ((((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) ∧ 𝑥 ∈ ℝ) ∧ 𝑧 ∈ ran 𝐹) → (∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^*, < ) ≤ 𝑥 → 𝑧 ≤ 𝑥))
152	151	ralrimdva 3155	. . . . 5 ⊢ (((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) ∧ 𝑥 ∈ ℝ) → (∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^*, < ) ≤ 𝑥 → ∀𝑧 ∈ ran 𝐹 𝑧 ≤ 𝑥))
153	8	ffnd 6719	. . . . . . 7 ⊢ (𝜑 → 𝐹 Fn 𝑋)
154	153	ad2antrr 725	. . . . . 6 ⊢ (((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) ∧ 𝑥 ∈ ℝ) → 𝐹 Fn 𝑋)
155		breq1 5152	. . . . . . 7 ⊢ (𝑧 = (𝐹‘𝑦) → (𝑧 ≤ 𝑥 ↔ (𝐹‘𝑦) ≤ 𝑥))
156	155	ralrn 7090	. . . . . 6 ⊢ (𝐹 Fn 𝑋 → (∀𝑧 ∈ ran 𝐹 𝑧 ≤ 𝑥 ↔ ∀𝑦 ∈ 𝑋 (𝐹‘𝑦) ≤ 𝑥))
157	154, 156	syl 17	. . . . 5 ⊢ (((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) ∧ 𝑥 ∈ ℝ) → (∀𝑧 ∈ ran 𝐹 𝑧 ≤ 𝑥 ↔ ∀𝑦 ∈ 𝑋 (𝐹‘𝑦) ≤ 𝑥))
158	152, 157	sylibd 238	. . . 4 ⊢ (((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) ∧ 𝑥 ∈ ℝ) → (∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^*, < ) ≤ 𝑥 → ∀𝑦 ∈ 𝑋 (𝐹‘𝑦) ≤ 𝑥))
159	158	reximdva 3169	. . 3 ⊢ ((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) → (∃𝑥 ∈ ℝ ∀𝑤 ∈ 𝑣 sup(𝑤, ℝ^*, < ) ≤ 𝑥 → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝑋 (𝐹‘𝑦) ≤ 𝑥))
160	121, 159	mpd 15	. 2 ⊢ ((𝜑 ∧ (𝑣 ∈ (𝒫 ((,) “ ({-∞} × ℝ)) ∩ Fin) ∧ ran 𝐹 ⊆ ∪ 𝑣)) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝑋 (𝐹‘𝑦) ≤ 𝑥)
161	68, 160	rexlimddv 3162	1 ⊢ (𝜑 → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝑋 (𝐹‘𝑦) ≤ 𝑥)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 397 ∧ w3a 1088 = wceq 1542 ∈ wcel 2107 ≠ wne 2941 ∀wral 3062 ∃wrex 3071 ∩ cin 3948 ⊆ wss 3949 ∅c0 4323 𝒫 cpw 4603 {csn 4629 ⟨cop 4635 ∪ cuni 4909 class class class wbr 5149 × cxp 5675 dom cdm 5677 ran crn 5678 “ cima 5680 Fun wfun 6538 Fn wfn 6539 ⟶wf 6540 ‘cfv 6544 (class class class)co 7409 Fincfn 8939 supcsup 9435 ℝcr 11109 1c1 11111 + caddc 11113 -∞cmnf 11246 ℝ^*cxr 11247 < clt 11248 ≤ cle 11249 (,)cioo 13324 ↾_t crest 17366 topGenctg 17383 Topctop 22395 TopOnctopon 22412 TopBasesctb 22448 Cn ccn 22728 Compccmp 22890

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187 ax-pre-sup 11188

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7856 df-1st 7975 df-2nd 7976 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-1o 8466 df-er 8703 df-map 8822 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-fi 9406 df-sup 9437 df-inf 9438 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-div 11872 df-nn 12213 df-n0 12473 df-z 12559 df-uz 12823 df-q 12933 df-ioo 13328 df-rest 17368 df-topgen 17389 df-top 22396 df-topon 22413 df-bases 22449 df-cn 22731 df-cmp 22891

This theorem is referenced by: evth 24475

W3C validator