Theorem itg2seq 25880

Description: Definitional property of the ∫₂ integral: for any function 𝐹 there is a countable sequence 𝑔 of simple functions less than 𝐹 whose integrals converge to the integral of 𝐹. (This theorem is for the most part unnecessary in lieu of itg2i1fseq 25893, but unlike that theorem this one doesn't require 𝐹 to be measurable.) (Contributed by Mario Carneiro, 14-Aug-2014.)

Assertion

Ref	Expression
itg2seq	⊢ (𝐹:ℝ⟶(0[,]+∞) → ∃𝑔(𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ (𝑔‘𝑛) ∘r ≤ 𝐹 ∧ (∫2‘𝐹) = sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < )))

Distinct variable group:   𝑔,𝑛,𝐹

Proof of Theorem itg2seq

Dummy variables 𝑓 𝑚 𝑥 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		nnre 12239	. . . . . . . . . . . 12 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℝ)
2	1	ad2antlr 739	. . . . . . . . . . 11 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ (∫2‘𝐹) = +∞) → 𝑛 ∈ ℝ)
3	2	ltpnfd 13145	. . . . . . . . . 10 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ (∫2‘𝐹) = +∞) → 𝑛 < +∞)
4		iftrue 4492	. . . . . . . . . . 11 ⊢ ((∫2‘𝐹) = +∞ → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) = 𝑛)
5	4	adantl 486	. . . . . . . . . 10 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ (∫2‘𝐹) = +∞) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) = 𝑛)
6		simpr 489	. . . . . . . . . 10 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ (∫2‘𝐹) = +∞) → (∫2‘𝐹) = +∞)
7	3, 5, 6	3brtr4d 5142	. . . . . . . . 9 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ (∫2‘𝐹) = +∞) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫2‘𝐹))
8		iffalse 4495	. . . . . . . . . . 11 ⊢ (¬ (∫2‘𝐹) = +∞ → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) = ((∫2‘𝐹) − (1 / 𝑛)))
9	8	adantl 486	. . . . . . . . . 10 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ ¬ (∫2‘𝐹) = +∞) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) = ((∫2‘𝐹) − (1 / 𝑛)))
10		itg2cl 25870	. . . . . . . . . . . . . . 15 ⊢ (𝐹:ℝ⟶(0[,]+∞) → (∫2‘𝐹) ∈ ℝ*)
11		xrrebnd 13193	. . . . . . . . . . . . . . 15 ⊢ ((∫2‘𝐹) ∈ ℝ* → ((∫2‘𝐹) ∈ ℝ ↔ (-∞ < (∫2‘𝐹) ∧ (∫2‘𝐹) < +∞)))
12	10, 11	syl 18	. . . . . . . . . . . . . 14 ⊢ (𝐹:ℝ⟶(0[,]+∞) → ((∫2‘𝐹) ∈ ℝ ↔ (-∞ < (∫2‘𝐹) ∧ (∫2‘𝐹) < +∞)))
13		itg2ge0 25873	. . . . . . . . . . . . . . . 16 ⊢ (𝐹:ℝ⟶(0[,]+∞) → 0 ≤ (∫2‘𝐹))
14		mnflt0 13149	. . . . . . . . . . . . . . . . 17 ⊢ -∞ < 0
15		mnfxr 11265	. . . . . . . . . . . . . . . . . 18 ⊢ -∞ ∈ ℝ*
16		0xr 11255	. . . . . . . . . . . . . . . . . 18 ⊢ 0 ∈ ℝ*
17		xrltletr 13181	. . . . . . . . . . . . . . . . . 18 ⊢ ((-∞ ∈ ℝ* ∧ 0 ∈ ℝ* ∧ (∫2‘𝐹) ∈ ℝ*) → ((-∞ < 0 ∧ 0 ≤ (∫2‘𝐹)) → -∞ < (∫2‘𝐹)))
18	15, 16, 10, 17	mp3an12i 1492	. . . . . . . . . . . . . . . . 17 ⊢ (𝐹:ℝ⟶(0[,]+∞) → ((-∞ < 0 ∧ 0 ≤ (∫2‘𝐹)) → -∞ < (∫2‘𝐹)))
19	14, 18	mpani 708	. . . . . . . . . . . . . . . 16 ⊢ (𝐹:ℝ⟶(0[,]+∞) → (0 ≤ (∫2‘𝐹) → -∞ < (∫2‘𝐹)))
20	13, 19	mpd 16	. . . . . . . . . . . . . . 15 ⊢ (𝐹:ℝ⟶(0[,]+∞) → -∞ < (∫2‘𝐹))
21	20	biantrurd 541	. . . . . . . . . . . . . 14 ⊢ (𝐹:ℝ⟶(0[,]+∞) → ((∫2‘𝐹) < +∞ ↔ (-∞ < (∫2‘𝐹) ∧ (∫2‘𝐹) < +∞)))
22		nltpnft 13189	. . . . . . . . . . . . . . . 16 ⊢ ((∫2‘𝐹) ∈ ℝ* → ((∫2‘𝐹) = +∞ ↔ ¬ (∫2‘𝐹) < +∞))
23	10, 22	syl 18	. . . . . . . . . . . . . . 15 ⊢ (𝐹:ℝ⟶(0[,]+∞) → ((∫2‘𝐹) = +∞ ↔ ¬ (∫2‘𝐹) < +∞))
24	23	con2bid 357	. . . . . . . . . . . . . 14 ⊢ (𝐹:ℝ⟶(0[,]+∞) → ((∫2‘𝐹) < +∞ ↔ ¬ (∫2‘𝐹) = +∞))
25	12, 21, 24	3bitr2rd 311	. . . . . . . . . . . . 13 ⊢ (𝐹:ℝ⟶(0[,]+∞) → (¬ (∫2‘𝐹) = +∞ ↔ (∫2‘𝐹) ∈ ℝ))
26	25	biimpa 481	. . . . . . . . . . . 12 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ ¬ (∫2‘𝐹) = +∞) → (∫2‘𝐹) ∈ ℝ)
27	26	adantlr 727	. . . . . . . . . . 11 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ ¬ (∫2‘𝐹) = +∞) → (∫2‘𝐹) ∈ ℝ)
28		nnrp 13027	. . . . . . . . . . . . 13 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℝ+)
29	28	rpreccld 13069	. . . . . . . . . . . 12 ⊢ (𝑛 ∈ ℕ → (1 / 𝑛) ∈ ℝ+)
30	29	ad2antlr 739	. . . . . . . . . . 11 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ ¬ (∫2‘𝐹) = +∞) → (1 / 𝑛) ∈ ℝ+)
31	27, 30	ltsubrpd 13091	. . . . . . . . . 10 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ ¬ (∫2‘𝐹) = +∞) → ((∫2‘𝐹) − (1 / 𝑛)) < (∫2‘𝐹))
32	9, 31	eqbrtrd 5132	. . . . . . . . 9 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ ¬ (∫2‘𝐹) = +∞) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫2‘𝐹))
33	7, 32	pm2.61dan 824	. . . . . . . 8 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫2‘𝐹))
34		nnrecre 12277	. . . . . . . . . . . . 13 ⊢ (𝑛 ∈ ℕ → (1 / 𝑛) ∈ ℝ)
35	34	ad2antlr 739	. . . . . . . . . . . 12 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ ¬ (∫2‘𝐹) = +∞) → (1 / 𝑛) ∈ ℝ)
36	27, 35	resubcld 11641	. . . . . . . . . . 11 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ ¬ (∫2‘𝐹) = +∞) → ((∫2‘𝐹) − (1 / 𝑛)) ∈ ℝ)
37	2, 36	ifclda 4522	. . . . . . . . . 10 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ)
38	37	rexrd 11258	. . . . . . . . 9 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ*)
39	10	adantr 485	. . . . . . . . 9 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) → (∫2‘𝐹) ∈ ℝ*)
40		xrltnle 11275	. . . . . . . . 9 ⊢ ((if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ* ∧ (∫2‘𝐹) ∈ ℝ*) → (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫2‘𝐹) ↔ ¬ (∫2‘𝐹) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛)))))
41	38, 39, 40	syl2anc 595	. . . . . . . 8 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) → (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫2‘𝐹) ↔ ¬ (∫2‘𝐹) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛)))))
42	33, 41	mpbid 235	. . . . . . 7 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) → ¬ (∫2‘𝐹) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))))
43		itg2leub 25872	. . . . . . . 8 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ*) → ((∫2‘𝐹) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ↔ ∀𝑓 ∈ dom ∫1(𝑓 ∘r ≤ 𝐹 → (∫1‘𝑓) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))))))
44	38, 43	syldan 602	. . . . . . 7 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) → ((∫2‘𝐹) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ↔ ∀𝑓 ∈ dom ∫1(𝑓 ∘r ≤ 𝐹 → (∫1‘𝑓) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))))))
45	42, 44	mtbid 327	. . . . . 6 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) → ¬ ∀𝑓 ∈ dom ∫1(𝑓 ∘r ≤ 𝐹 → (∫1‘𝑓) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛)))))
46		rexanali 3117	. . . . . 6 ⊢ (∃𝑓 ∈ dom ∫1(𝑓 ∘r ≤ 𝐹 ∧ ¬ (∫1‘𝑓) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛)))) ↔ ¬ ∀𝑓 ∈ dom ∫1(𝑓 ∘r ≤ 𝐹 → (∫1‘𝑓) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛)))))
47	45, 46	sylibr 237	. . . . 5 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) → ∃𝑓 ∈ dom ∫1(𝑓 ∘r ≤ 𝐹 ∧ ¬ (∫1‘𝑓) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛)))))
48		itg1cl 25823	. . . . . . . 8 ⊢ (𝑓 ∈ dom ∫1 → (∫1‘𝑓) ∈ ℝ)
49		ltnle 11288	. . . . . . . 8 ⊢ ((if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ ∧ (∫1‘𝑓) ∈ ℝ) → (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘𝑓) ↔ ¬ (∫1‘𝑓) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛)))))
50	37, 48, 49	syl2an 607	. . . . . . 7 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ 𝑓 ∈ dom ∫1) → (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘𝑓) ↔ ¬ (∫1‘𝑓) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛)))))
51	50	anbi2d 641	. . . . . 6 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) ∧ 𝑓 ∈ dom ∫1) → ((𝑓 ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘𝑓)) ↔ (𝑓 ∘r ≤ 𝐹 ∧ ¬ (∫1‘𝑓) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))))))
52	51	rexbidva 3185	. . . . 5 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) → (∃𝑓 ∈ dom ∫1(𝑓 ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘𝑓)) ↔ ∃𝑓 ∈ dom ∫1(𝑓 ∘r ≤ 𝐹 ∧ ¬ (∫1‘𝑓) ≤ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))))))
53	47, 52	mpbird 260	. . . 4 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑛 ∈ ℕ) → ∃𝑓 ∈ dom ∫1(𝑓 ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘𝑓)))
54	53	ralrimiva 3155	. . 3 ⊢ (𝐹:ℝ⟶(0[,]+∞) → ∀𝑛 ∈ ℕ ∃𝑓 ∈ dom ∫1(𝑓 ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘𝑓)))
55		ovex 7443	. . . . 5 ⊢ (ℝ ↑m ℝ) ∈ V
56		i1ff 25814	. . . . . . 7 ⊢ (𝑥 ∈ dom ∫1 → 𝑥:ℝ⟶ℝ)
57		reex 11190	. . . . . . . 8 ⊢ ℝ ∈ V
58	57, 57	elmap 8868	. . . . . . 7 ⊢ (𝑥 ∈ (ℝ ↑m ℝ) ↔ 𝑥:ℝ⟶ℝ)
59	56, 58	sylibr 237	. . . . . 6 ⊢ (𝑥 ∈ dom ∫1 → 𝑥 ∈ (ℝ ↑m ℝ))
60	59	ssriv 3940	. . . . 5 ⊢ dom ∫1 ⊆ (ℝ ↑m ℝ)
61	55, 60	ssexi 5292	. . . 4 ⊢ dom ∫1 ∈ V
62		nnenom 14015	. . . 4 ⊢ ℕ ≈ ω
63		breq1 5111	. . . . 5 ⊢ (𝑓 = (𝑔‘𝑛) → (𝑓 ∘r ≤ 𝐹 ↔ (𝑔‘𝑛) ∘r ≤ 𝐹))
64		fveq2 6881	. . . . . 6 ⊢ (𝑓 = (𝑔‘𝑛) → (∫1‘𝑓) = (∫1‘(𝑔‘𝑛)))
65	64	breq2d 5120	. . . . 5 ⊢ (𝑓 = (𝑔‘𝑛) → (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘𝑓) ↔ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))
66	63, 65	anbi12d 643	. . . 4 ⊢ (𝑓 = (𝑔‘𝑛) → ((𝑓 ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘𝑓)) ↔ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛)))))
67	61, 62, 66	axcc4 10422	. . 3 ⊢ (∀𝑛 ∈ ℕ ∃𝑓 ∈ dom ∫1(𝑓 ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘𝑓)) → ∃𝑔(𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛)))))
68	54, 67	syl 18	. 2 ⊢ (𝐹:ℝ⟶(0[,]+∞) → ∃𝑔(𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛)))))
69		simprl 782	. . . . 5 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → 𝑔:ℕ⟶dom ∫1)
70		simpl 487	. . . . . . 7 ⊢ (((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))) → (𝑔‘𝑛) ∘r ≤ 𝐹)
71	70	ralimi 3100	. . . . . 6 ⊢ (∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))) → ∀𝑛 ∈ ℕ (𝑔‘𝑛) ∘r ≤ 𝐹)
72	71	ad2antll 741	. . . . 5 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → ∀𝑛 ∈ ℕ (𝑔‘𝑛) ∘r ≤ 𝐹)
73	10	adantr 485	. . . . . 6 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → (∫2‘𝐹) ∈ ℝ*)
74		ffvelcdm 7076	. . . . . . . . . . . 12 ⊢ ((𝑔:ℕ⟶dom ∫1 ∧ 𝑛 ∈ ℕ) → (𝑔‘𝑛) ∈ dom ∫1)
75		itg1cl 25823	. . . . . . . . . . . 12 ⊢ ((𝑔‘𝑛) ∈ dom ∫1 → (∫1‘(𝑔‘𝑛)) ∈ ℝ)
76	74, 75	syl 18	. . . . . . . . . . 11 ⊢ ((𝑔:ℕ⟶dom ∫1 ∧ 𝑛 ∈ ℕ) → (∫1‘(𝑔‘𝑛)) ∈ ℝ)
77	76	fmpttd 7110	. . . . . . . . . 10 ⊢ (𝑔:ℕ⟶dom ∫1 → (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))):ℕ⟶ℝ)
78	77	ad2antrl 740	. . . . . . . . 9 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))):ℕ⟶ℝ)
79	78	frnd 6714	. . . . . . . 8 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))) ⊆ ℝ)
80		ressxr 11252	. . . . . . . 8 ⊢ ℝ ⊆ ℝ*
81	79, 80	sstrdi 3948	. . . . . . 7 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))) ⊆ ℝ*)
82		supxrcl 13340	. . . . . . 7 ⊢ (ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))) ⊆ ℝ* → sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < ) ∈ ℝ*)
83	81, 82	syl 18	. . . . . 6 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < ) ∈ ℝ*)
84	38	adantlr 727	. . . . . . . . . . . . 13 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ*)
85	76	adantll 726	. . . . . . . . . . . . . 14 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → (∫1‘(𝑔‘𝑛)) ∈ ℝ)
86	85	rexrd 11258	. . . . . . . . . . . . 13 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → (∫1‘(𝑔‘𝑛)) ∈ ℝ*)
87		xrltle 13173	. . . . . . . . . . . . 13 ⊢ ((if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ* ∧ (∫1‘(𝑔‘𝑛)) ∈ ℝ*) → (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛)) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ (∫1‘(𝑔‘𝑛))))
88	84, 86, 87	syl2anc 595	. . . . . . . . . . . 12 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛)) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ (∫1‘(𝑔‘𝑛))))
89		2fveq3 6886	. . . . . . . . . . . . . . . . 17 ⊢ (𝑛 = 𝑚 → (∫1‘(𝑔‘𝑛)) = (∫1‘(𝑔‘𝑚)))
90	89	cbvmptv 5214	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))) = (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚)))
91	90	rneqi 5927	. . . . . . . . . . . . . . 15 ⊢ ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))) = ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚)))
92	77	adantl 486	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) → (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))):ℕ⟶ℝ)
93	92	frnd 6714	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) → ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))) ⊆ ℝ)
94	93, 80	sstrdi 3948	. . . . . . . . . . . . . . . 16 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) → ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))) ⊆ ℝ*)
95	94	adantr 485	. . . . . . . . . . . . . . 15 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))) ⊆ ℝ*)
96	91, 95	eqsstrrid 3975	. . . . . . . . . . . . . 14 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))) ⊆ ℝ*)
97		2fveq3 6886	. . . . . . . . . . . . . . . . 17 ⊢ (𝑚 = 𝑛 → (∫1‘(𝑔‘𝑚)) = (∫1‘(𝑔‘𝑛)))
98		eqid 2761	. . . . . . . . . . . . . . . . 17 ⊢ (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))) = (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚)))
99		fvex 6894	. . . . . . . . . . . . . . . . 17 ⊢ (∫1‘(𝑔‘𝑛)) ∈ V
100	97, 98, 99	fvmpt 6989	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 ∈ ℕ → ((𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚)))‘𝑛) = (∫1‘(𝑔‘𝑛)))
101		fvex 6894	. . . . . . . . . . . . . . . . . 18 ⊢ (∫1‘(𝑔‘𝑚)) ∈ V
102	101, 98	fnmpti 6678	. . . . . . . . . . . . . . . . 17 ⊢ (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))) Fn ℕ
103		fnfvelrn 7075	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))) Fn ℕ ∧ 𝑛 ∈ ℕ) → ((𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚)))‘𝑛) ∈ ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))))
104	102, 103	mpan 702	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 ∈ ℕ → ((𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚)))‘𝑛) ∈ ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))))
105	100, 104	eqeltrrd 2862	. . . . . . . . . . . . . . 15 ⊢ (𝑛 ∈ ℕ → (∫1‘(𝑔‘𝑛)) ∈ ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))))
106	105	adantl 486	. . . . . . . . . . . . . 14 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → (∫1‘(𝑔‘𝑛)) ∈ ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))))
107		supxrub 13349	. . . . . . . . . . . . . 14 ⊢ ((ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))) ⊆ ℝ* ∧ (∫1‘(𝑔‘𝑛)) ∈ ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚)))) → (∫1‘(𝑔‘𝑛)) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ))
108	96, 106, 107	syl2anc 595	. . . . . . . . . . . . 13 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → (∫1‘(𝑔‘𝑛)) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ))
109	91	supeq1i 9406	. . . . . . . . . . . . . . 15 ⊢ sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < ) = sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < )
110	95, 82	syl 18	. . . . . . . . . . . . . . 15 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < ) ∈ ℝ*)
111	109, 110	eqeltrrid 2866	. . . . . . . . . . . . . 14 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ) ∈ ℝ*)
112		xrletr 13182	. . . . . . . . . . . . . 14 ⊢ ((if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ* ∧ (∫1‘(𝑔‘𝑛)) ∈ ℝ* ∧ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ) ∈ ℝ*) → ((if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ (∫1‘(𝑔‘𝑛)) ∧ (∫1‘(𝑔‘𝑛)) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < )) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < )))
113	84, 86, 111, 112	syl3anc 1396	. . . . . . . . . . . . 13 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → ((if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ (∫1‘(𝑔‘𝑛)) ∧ (∫1‘(𝑔‘𝑛)) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < )) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < )))
114	108, 113	mpan2d 706	. . . . . . . . . . . 12 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ (∫1‘(𝑔‘𝑛)) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < )))
115	88, 114	syld 48	. . . . . . . . . . 11 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛)) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < )))
116	115	adantld 495	. . . . . . . . . 10 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → (((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < )))
117	116	ralimdva 3175	. . . . . . . . 9 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) → (∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))) → ∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < )))
118	117	impr 459	. . . . . . . 8 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → ∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ))
119		breq2 5112	. . . . . . . . . . 11 ⊢ (𝑥 = sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ) → (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 ↔ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < )))
120	119	ralbidv 3186	. . . . . . . . . 10 ⊢ (𝑥 = sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ) → (∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 ↔ ∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < )))
121		breq2 5112	. . . . . . . . . 10 ⊢ (𝑥 = sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ) → ((∫2‘𝐹) ≤ 𝑥 ↔ (∫2‘𝐹) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < )))
122	120, 121	imbi12d 347	. . . . . . . . 9 ⊢ (𝑥 = sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ) → ((∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 → (∫2‘𝐹) ≤ 𝑥) ↔ (∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ) → (∫2‘𝐹) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ))))
123		elxr 13140	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ ℝ* ↔ (𝑥 ∈ ℝ ∨ 𝑥 = +∞ ∨ 𝑥 = -∞))
124		simplrl 788	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ (∫2‘𝐹) = +∞) → 𝑥 ∈ ℝ)
125		arch 12500	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑥 ∈ ℝ → ∃𝑛 ∈ ℕ 𝑥 < 𝑛)
126	124, 125	syl 18	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ (∫2‘𝐹) = +∞) → ∃𝑛 ∈ ℕ 𝑥 < 𝑛)
127	4	adantl 486	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ (∫2‘𝐹) = +∞) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) = 𝑛)
128	127	breq2d 5120	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ (∫2‘𝐹) = +∞) → (𝑥 < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ↔ 𝑥 < 𝑛))
129	128	rexbidv 3187	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ (∫2‘𝐹) = +∞) → (∃𝑛 ∈ ℕ 𝑥 < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ↔ ∃𝑛 ∈ ℕ 𝑥 < 𝑛))
130	126, 129	mpbird 260	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ (∫2‘𝐹) = +∞) → ∃𝑛 ∈ ℕ 𝑥 < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))))
131	26	adantlr 727	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) → (∫2‘𝐹) ∈ ℝ)
132		simplrl 788	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) → 𝑥 ∈ ℝ)
133	131, 132	resubcld 11641	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) → ((∫2‘𝐹) − 𝑥) ∈ ℝ)
134		simplrr 789	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) → 𝑥 < (∫2‘𝐹))
135	132, 131	posdifd 11800	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) → (𝑥 < (∫2‘𝐹) ↔ 0 < ((∫2‘𝐹) − 𝑥)))
136	134, 135	mpbid 235	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) → 0 < ((∫2‘𝐹) − 𝑥))
137		nnrecl 12501	. . . . . . . . . . . . . . . . . . 19 ⊢ ((((∫2‘𝐹) − 𝑥) ∈ ℝ ∧ 0 < ((∫2‘𝐹) − 𝑥)) → ∃𝑛 ∈ ℕ (1 / 𝑛) < ((∫2‘𝐹) − 𝑥))
138	133, 136, 137	syl2anc 595	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) → ∃𝑛 ∈ ℕ (1 / 𝑛) < ((∫2‘𝐹) − 𝑥))
139	34	adantl 486	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) ∧ 𝑛 ∈ ℕ) → (1 / 𝑛) ∈ ℝ)
140	131	adantr 485	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) ∧ 𝑛 ∈ ℕ) → (∫2‘𝐹) ∈ ℝ)
141	132	adantr 485	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) ∧ 𝑛 ∈ ℕ) → 𝑥 ∈ ℝ)
142		ltsub13 11694	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((1 / 𝑛) ∈ ℝ ∧ (∫2‘𝐹) ∈ ℝ ∧ 𝑥 ∈ ℝ) → ((1 / 𝑛) < ((∫2‘𝐹) − 𝑥) ↔ 𝑥 < ((∫2‘𝐹) − (1 / 𝑛))))
143	139, 140, 141, 142	syl3anc 1396	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) ∧ 𝑛 ∈ ℕ) → ((1 / 𝑛) < ((∫2‘𝐹) − 𝑥) ↔ 𝑥 < ((∫2‘𝐹) − (1 / 𝑛))))
144	8	ad2antlr 739	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) ∧ 𝑛 ∈ ℕ) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) = ((∫2‘𝐹) − (1 / 𝑛)))
145	144	breq2d 5120	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) ∧ 𝑛 ∈ ℕ) → (𝑥 < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ↔ 𝑥 < ((∫2‘𝐹) − (1 / 𝑛))))
146	143, 145	bitr4d 285	. . . . . . . . . . . . . . . . . . 19 ⊢ ((((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) ∧ 𝑛 ∈ ℕ) → ((1 / 𝑛) < ((∫2‘𝐹) − 𝑥) ↔ 𝑥 < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛)))))
147	146	rexbidva 3185	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) → (∃𝑛 ∈ ℕ (1 / 𝑛) < ((∫2‘𝐹) − 𝑥) ↔ ∃𝑛 ∈ ℕ 𝑥 < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛)))))
148	138, 147	mpbid 235	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) ∧ ¬ (∫2‘𝐹) = +∞) → ∃𝑛 ∈ ℕ 𝑥 < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))))
149	130, 148	pm2.61dan 824	. . . . . . . . . . . . . . . 16 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < (∫2‘𝐹))) → ∃𝑛 ∈ ℕ 𝑥 < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))))
150	149	expr 461	. . . . . . . . . . . . . . 15 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 ∈ ℝ) → (𝑥 < (∫2‘𝐹) → ∃𝑛 ∈ ℕ 𝑥 < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛)))))
151		rexr 11254	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 ∈ ℝ → 𝑥 ∈ ℝ*)
152		xrltnle 11275	. . . . . . . . . . . . . . . 16 ⊢ ((𝑥 ∈ ℝ* ∧ (∫2‘𝐹) ∈ ℝ*) → (𝑥 < (∫2‘𝐹) ↔ ¬ (∫2‘𝐹) ≤ 𝑥))
153	151, 10, 152	syl2anr 608	. . . . . . . . . . . . . . 15 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 ∈ ℝ) → (𝑥 < (∫2‘𝐹) ↔ ¬ (∫2‘𝐹) ≤ 𝑥))
154	151	ad2antlr 739	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → 𝑥 ∈ ℝ*)
155	38	adantlr 727	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ*)
156		xrltnle 11275	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑥 ∈ ℝ* ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ*) → (𝑥 < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ↔ ¬ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥))
157	154, 155, 156	syl2anc 595	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → (𝑥 < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ↔ ¬ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥))
158	157	rexbidva 3185	. . . . . . . . . . . . . . . 16 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 ∈ ℝ) → (∃𝑛 ∈ ℕ 𝑥 < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ↔ ∃𝑛 ∈ ℕ ¬ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥))
159		rexnal 3115	. . . . . . . . . . . . . . . 16 ⊢ (∃𝑛 ∈ ℕ ¬ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 ↔ ¬ ∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥)
160	158, 159	bitrdi 290	. . . . . . . . . . . . . . 15 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 ∈ ℝ) → (∃𝑛 ∈ ℕ 𝑥 < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ↔ ¬ ∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥))
161	150, 153, 160	3imtr3d 296	. . . . . . . . . . . . . 14 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 ∈ ℝ) → (¬ (∫2‘𝐹) ≤ 𝑥 → ¬ ∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥))
162	161	con4d 116	. . . . . . . . . . . . 13 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 ∈ ℝ) → (∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 → (∫2‘𝐹) ≤ 𝑥))
163	10	adantr 485	. . . . . . . . . . . . . . . 16 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 = +∞) → (∫2‘𝐹) ∈ ℝ*)
164		pnfge 13154	. . . . . . . . . . . . . . . 16 ⊢ ((∫2‘𝐹) ∈ ℝ* → (∫2‘𝐹) ≤ +∞)
165	163, 164	syl 18	. . . . . . . . . . . . . . 15 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 = +∞) → (∫2‘𝐹) ≤ +∞)
166		simpr 489	. . . . . . . . . . . . . . 15 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 = +∞) → 𝑥 = +∞)
167	165, 166	breqtrrd 5138	. . . . . . . . . . . . . 14 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 = +∞) → (∫2‘𝐹) ≤ 𝑥)
168	167	a1d 26	. . . . . . . . . . . . 13 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 = +∞) → (∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 → (∫2‘𝐹) ≤ 𝑥))
169		1nn 12243	. . . . . . . . . . . . . . . 16 ⊢ 1 ∈ ℕ
170	169	ne0ii 4296	. . . . . . . . . . . . . . 15 ⊢ ℕ ≠ ∅
171		r19.2z 4459	. . . . . . . . . . . . . . 15 ⊢ ((ℕ ≠ ∅ ∧ ∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥) → ∃𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥)
172	170, 171	mpan 702	. . . . . . . . . . . . . 14 ⊢ (∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 → ∃𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥)
173	37	adantlr 727	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 = -∞) ∧ 𝑛 ∈ ℕ) → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ)
174		mnflt 13147	. . . . . . . . . . . . . . . . . . 19 ⊢ (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ → -∞ < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))))
175		rexr 11254	. . . . . . . . . . . . . . . . . . . 20 ⊢ (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ → if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ*)
176		xrltnle 11275	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((-∞ ∈ ℝ* ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ*) → (-∞ < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ↔ ¬ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ -∞))
177	15, 175, 176	sylancr 598	. . . . . . . . . . . . . . . . . . 19 ⊢ (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ → (-∞ < if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ↔ ¬ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ -∞))
178	174, 177	mpbid 235	. . . . . . . . . . . . . . . . . 18 ⊢ (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ∈ ℝ → ¬ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ -∞)
179	173, 178	syl 18	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 = -∞) ∧ 𝑛 ∈ ℕ) → ¬ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ -∞)
180		simplr 780	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 = -∞) ∧ 𝑛 ∈ ℕ) → 𝑥 = -∞)
181	180	breq2d 5120	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 = -∞) ∧ 𝑛 ∈ ℕ) → (if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 ↔ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ -∞))
182	179, 181	mtbird 328	. . . . . . . . . . . . . . . 16 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 = -∞) ∧ 𝑛 ∈ ℕ) → ¬ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥)
183	182	nrexdv 3158	. . . . . . . . . . . . . . 15 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 = -∞) → ¬ ∃𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥)
184	183	pm2.21d 122	. . . . . . . . . . . . . 14 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 = -∞) → (∃𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 → (∫2‘𝐹) ≤ 𝑥))
185	172, 184	syl5 35	. . . . . . . . . . . . 13 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 = -∞) → (∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 → (∫2‘𝐹) ≤ 𝑥))
186	162, 168, 185	3jaodan 1456	. . . . . . . . . . . 12 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑥 ∈ ℝ ∨ 𝑥 = +∞ ∨ 𝑥 = -∞)) → (∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 → (∫2‘𝐹) ≤ 𝑥))
187	123, 186	sylan2b 605	. . . . . . . . . . 11 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑥 ∈ ℝ*) → (∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 → (∫2‘𝐹) ≤ 𝑥))
188	187	ralrimiva 3155	. . . . . . . . . 10 ⊢ (𝐹:ℝ⟶(0[,]+∞) → ∀𝑥 ∈ ℝ* (∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 → (∫2‘𝐹) ≤ 𝑥))
189	188	adantr 485	. . . . . . . . 9 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → ∀𝑥 ∈ ℝ* (∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ 𝑥 → (∫2‘𝐹) ≤ 𝑥))
190	109, 83	eqeltrrid 2866	. . . . . . . . 9 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ) ∈ ℝ*)
191	122, 189, 190	rspcdva 3581	. . . . . . . 8 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → (∀𝑛 ∈ ℕ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ) → (∫2‘𝐹) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < )))
192	118, 191	mpd 16	. . . . . . 7 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → (∫2‘𝐹) ≤ sup(ran (𝑚 ∈ ℕ ↦ (∫1‘(𝑔‘𝑚))), ℝ*, < ))
193	192, 109	breqtrrdi 5152	. . . . . 6 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → (∫2‘𝐹) ≤ sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < ))
194		itg2ub 25871	. . . . . . . . . . . . . . 15 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔‘𝑛) ∈ dom ∫1 ∧ (𝑔‘𝑛) ∘r ≤ 𝐹) → (∫1‘(𝑔‘𝑛)) ≤ (∫2‘𝐹))
195	194	3expia 1137	. . . . . . . . . . . . . 14 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔‘𝑛) ∈ dom ∫1) → ((𝑔‘𝑛) ∘r ≤ 𝐹 → (∫1‘(𝑔‘𝑛)) ≤ (∫2‘𝐹)))
196	74, 195	sylan2 604	. . . . . . . . . . . . 13 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ 𝑛 ∈ ℕ)) → ((𝑔‘𝑛) ∘r ≤ 𝐹 → (∫1‘(𝑔‘𝑛)) ≤ (∫2‘𝐹)))
197	196	anassrs 472	. . . . . . . . . . . 12 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → ((𝑔‘𝑛) ∘r ≤ 𝐹 → (∫1‘(𝑔‘𝑛)) ≤ (∫2‘𝐹)))
198	197	adantrd 496	. . . . . . . . . . 11 ⊢ (((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) ∧ 𝑛 ∈ ℕ) → (((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))) → (∫1‘(𝑔‘𝑛)) ≤ (∫2‘𝐹)))
199	198	ralimdva 3175	. . . . . . . . . 10 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ 𝑔:ℕ⟶dom ∫1) → (∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))) → ∀𝑛 ∈ ℕ (∫1‘(𝑔‘𝑛)) ≤ (∫2‘𝐹)))
200	199	impr 459	. . . . . . . . 9 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → ∀𝑛 ∈ ℕ (∫1‘(𝑔‘𝑛)) ≤ (∫2‘𝐹))
201		eqid 2761	. . . . . . . . . . . . 13 ⊢ (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))) = (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))
202	89, 201, 101	fvmpt 6989	. . . . . . . . . . . 12 ⊢ (𝑚 ∈ ℕ → ((𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))‘𝑚) = (∫1‘(𝑔‘𝑚)))
203	202	breq1d 5118	. . . . . . . . . . 11 ⊢ (𝑚 ∈ ℕ → (((𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))‘𝑚) ≤ (∫2‘𝐹) ↔ (∫1‘(𝑔‘𝑚)) ≤ (∫2‘𝐹)))
204	203	ralbiia 3107	. . . . . . . . . 10 ⊢ (∀𝑚 ∈ ℕ ((𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))‘𝑚) ≤ (∫2‘𝐹) ↔ ∀𝑚 ∈ ℕ (∫1‘(𝑔‘𝑚)) ≤ (∫2‘𝐹))
205	89	breq1d 5118	. . . . . . . . . . 11 ⊢ (𝑛 = 𝑚 → ((∫1‘(𝑔‘𝑛)) ≤ (∫2‘𝐹) ↔ (∫1‘(𝑔‘𝑚)) ≤ (∫2‘𝐹)))
206	205	cbvralvw 3241	. . . . . . . . . 10 ⊢ (∀𝑛 ∈ ℕ (∫1‘(𝑔‘𝑛)) ≤ (∫2‘𝐹) ↔ ∀𝑚 ∈ ℕ (∫1‘(𝑔‘𝑚)) ≤ (∫2‘𝐹))
207	204, 206	bitr4i 281	. . . . . . . . 9 ⊢ (∀𝑚 ∈ ℕ ((𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))‘𝑚) ≤ (∫2‘𝐹) ↔ ∀𝑛 ∈ ℕ (∫1‘(𝑔‘𝑛)) ≤ (∫2‘𝐹))
208	200, 207	sylibr 237	. . . . . . . 8 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → ∀𝑚 ∈ ℕ ((𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))‘𝑚) ≤ (∫2‘𝐹))
209		ffn 6705	. . . . . . . . 9 ⊢ ((𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))):ℕ⟶ℝ → (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))) Fn ℕ)
210		breq1 5111	. . . . . . . . . 10 ⊢ (𝑧 = ((𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))‘𝑚) → (𝑧 ≤ (∫2‘𝐹) ↔ ((𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))‘𝑚) ≤ (∫2‘𝐹)))
211	210	ralrn 7083	. . . . . . . . 9 ⊢ ((𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))) Fn ℕ → (∀𝑧 ∈ ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))𝑧 ≤ (∫2‘𝐹) ↔ ∀𝑚 ∈ ℕ ((𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))‘𝑚) ≤ (∫2‘𝐹)))
212	78, 209, 211	3syl 19	. . . . . . . 8 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → (∀𝑧 ∈ ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))𝑧 ≤ (∫2‘𝐹) ↔ ∀𝑚 ∈ ℕ ((𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))‘𝑚) ≤ (∫2‘𝐹)))
213	208, 212	mpbird 260	. . . . . . 7 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → ∀𝑧 ∈ ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))𝑧 ≤ (∫2‘𝐹))
214		supxrleub 13351	. . . . . . . 8 ⊢ ((ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))) ⊆ ℝ* ∧ (∫2‘𝐹) ∈ ℝ*) → (sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < ) ≤ (∫2‘𝐹) ↔ ∀𝑧 ∈ ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))𝑧 ≤ (∫2‘𝐹)))
215	81, 73, 214	syl2anc 595	. . . . . . 7 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → (sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < ) ≤ (∫2‘𝐹) ↔ ∀𝑧 ∈ ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛)))𝑧 ≤ (∫2‘𝐹)))
216	213, 215	mpbird 260	. . . . . 6 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < ) ≤ (∫2‘𝐹))
217	73, 83, 193, 216	xrletrid 13179	. . . . 5 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → (∫2‘𝐹) = sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < ))
218	69, 72, 217	3jca 1144	. . . 4 ⊢ ((𝐹:ℝ⟶(0[,]+∞) ∧ (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛))))) → (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ (𝑔‘𝑛) ∘r ≤ 𝐹 ∧ (∫2‘𝐹) = sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < )))
219	218	ex 417	. . 3 ⊢ (𝐹:ℝ⟶(0[,]+∞) → ((𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛)))) → (𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ (𝑔‘𝑛) ∘r ≤ 𝐹 ∧ (∫2‘𝐹) = sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < ))))
220	219	eximdv 1945	. 2 ⊢ (𝐹:ℝ⟶(0[,]+∞) → (∃𝑔(𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ ((𝑔‘𝑛) ∘r ≤ 𝐹 ∧ if((∫2‘𝐹) = +∞, 𝑛, ((∫2‘𝐹) − (1 / 𝑛))) < (∫1‘(𝑔‘𝑛)))) → ∃𝑔(𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ (𝑔‘𝑛) ∘r ≤ 𝐹 ∧ (∫2‘𝐹) = sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < ))))
221	68, 220	mpd 16	1 ⊢ (𝐹:ℝ⟶(0[,]+∞) → ∃𝑔(𝑔:ℕ⟶dom ∫1 ∧ ∀𝑛 ∈ ℕ (𝑔‘𝑛) ∘r ≤ 𝐹 ∧ (∫2‘𝐹) = sup(ran (𝑛 ∈ ℕ ↦ (∫1‘(𝑔‘𝑛))), ℝ*, < )))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 209   ∧ wa 400   ∨ w3o 1100   ∧ w3a 1101   = wceq 1568  ∃wex 1807   ∈ wcel 2141   ≠ wne 2956  ∀wral 3077  ∃wrex 3087   ⊆ wss 3904  ∅c0 4285  ifcif 4486   class class class wbr 5108   ↦ cmpt 5191  dom cdm 5661  ran crn 5662   Fn wfn 6531  ⟶wf 6532  ‘cfv 6536  (class class class)co 7410   ∘_r cofr 7673   ↑_m cmap 8823  supcsup 9399  ℝcr 11098  0cc0 11099  1c1 11100  +∞cpnf 11239  -∞cmnf 11240  ℝ^*cxr 11241   < clt 11242   ≤ cle 11243   − cmin 11440   / cdiv 11870  ℕcn 12232  ℝ⁺crp 13015  [,]cicc 13374  ∫₁citg1 25753  ∫₂citg2 25754

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1823  ax-4 1837  ax-5 1938  ax-6 1995  ax-7 2036  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-rep 5237  ax-sep 5256  ax-nul 5268  ax-pow 5336  ax-pr 5404  ax-un 7732  ax-inf2 9609  ax-cc 10418  ax-cnex 11155  ax-resscn 11156  ax-1cn 11157  ax-icn 11158  ax-addcl 11159  ax-addrcl 11160  ax-mulcl 11161  ax-mulrcl 11162  ax-mulcom 11163  ax-addass 11164  ax-mulass 11165  ax-distr 11166  ax-i2m1 11167  ax-1ne0 11168  ax-1rid 11169  ax-rnegex 11170  ax-rrecex 11171  ax-cnre 11172  ax-pre-lttri 11173  ax-pre-lttrn 11174  ax-pre-ltadd 11175  ax-pre-mulgt0 11176  ax-pre-sup 11177

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1102  df-3an 1103  df-tru 1571  df-fal 1581  df-ex 1808  df-nf 1812  df-sb 2095  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-nel 3063  df-ral 3078  df-rex 3088  df-rmo 3367  df-reu 3368  df-rab 3415  df-v 3455  df-sbc 3744  df-csb 3853  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-pss 3924  df-nul 4286  df-if 4487  df-pw 4563  df-sn 4589  df-pr 4591  df-op 4595  df-uni 4872  df-int 4912  df-iun 4957  df-br 5109  df-opab 5173  df-mpt 5192  df-tr 5218  df-id 5556  df-eprel 5561  df-po 5569  df-so 5570  df-fr 5614  df-se 5615  df-we 5616  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-res 5673  df-ima 5674  df-pred 6302  df-ord 6363  df-on 6364  df-lim 6365  df-suc 6366  df-iota 6492  df-fun 6538  df-fn 6539  df-f 6540  df-f1 6541  df-fo 6542  df-f1o 6543  df-fv 6544  df-isom 6545  df-riota 7367  df-ov 7413  df-oprab 7414  df-mpo 7415  df-of 7674  df-ofr 7675  df-om 7862  df-1st 7985  df-2nd 7986  df-frecs 8277  df-wrecs 8308  df-recs 8357  df-rdg 8396  df-1o 8452  df-2o 8453  df-er 8693  df-map 8825  df-pm 8826  df-en 8943  df-dom 8944  df-sdom 8945  df-fin 8946  df-sup 9401  df-inf 9402  df-oi 9471  df-dju 9886  df-card 9924  df-pnf 11244  df-mnf 11245  df-xr 11246  df-ltxr 11247  df-le 11248  df-sub 11442  df-neg 11443  df-div 11871  df-nn 12233  df-2 12302  df-3 12303  df-n0 12504  df-z 12591  df-uz 12862  df-q 12972  df-rp 13016  df-xadd 13137  df-ioo 13375  df-ico 13377  df-icc 13378  df-fz 13535  df-fzo 13682  df-fl 13824  df-seq 14037  df-exp 14097  df-hash 14366  df-cj 15149  df-re 15150  df-im 15151  df-sqrt 15285  df-abs 15286  df-clim 15538  df-sum 15737  df-xmet 21494  df-met 21495  df-ovol 25602  df-vol 25603  df-mbf 25757  df-itg1 25758  df-itg2 25759

This theorem is referenced by: (None)