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Theorem ftc1lem1 25998

Description: Lemma for ftc1a 26000 and ftc1 26005. (Contributed by Mario Carneiro, 31-Aug-2014.)

**Hypotheses**
Ref	Expression
ftc1.g	⊢ 𝐺 = (𝑥 ∈ (𝐴[,]𝐵) ↦ ∫(𝐴(,)𝑥)(𝐹‘𝑡) d𝑡)
ftc1.a	⊢ (𝜑 → 𝐴 ∈ ℝ)
ftc1.b	⊢ (𝜑 → 𝐵 ∈ ℝ)
ftc1.le	⊢ (𝜑 → 𝐴 ≤ 𝐵)
ftc1.s	⊢ (𝜑 → (𝐴(,)𝐵) ⊆ 𝐷)
ftc1.d	⊢ (𝜑 → 𝐷 ⊆ ℝ)
ftc1.i	⊢ (𝜑 → 𝐹 ∈ 𝐿¹)
ftc1a.f	⊢ (𝜑 → 𝐹:𝐷⟶ℂ)
ftc1lem1.x	⊢ (𝜑 → 𝑋 ∈ (𝐴[,]𝐵))
ftc1lem1.y	⊢ (𝜑 → 𝑌 ∈ (𝐴[,]𝐵))

**Assertion**
Ref	Expression
ftc1lem1	⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → ((𝐺‘𝑌) − (𝐺‘𝑋)) = ∫(𝑋(,)𝑌)(𝐹‘𝑡) d𝑡)

Distinct variable groups: 𝑥,𝑡,𝐷 𝑡,𝐴,𝑥 𝑡,𝐵,𝑥 𝑡,𝑋,𝑥 𝜑,𝑡,𝑥 𝑡,𝑌,𝑥 𝑡,𝐹,𝑥 Allowed substitution hints: 𝐺(𝑥,𝑡)

**Proof of Theorem ftc1lem1**
Step	Hyp	Ref	Expression
1		ftc1lem1.y	. . . . . 6 ⊢ (𝜑 → 𝑌 ∈ (𝐴[,]𝐵))
2		oveq2 7434	. . . . . . . 8 ⊢ (𝑥 = 𝑌 → (𝐴(,)𝑥) = (𝐴(,)𝑌))
3		itgeq1 25730	. . . . . . . 8 ⊢ ((𝐴(,)𝑥) = (𝐴(,)𝑌) → ∫(𝐴(,)𝑥)(𝐹‘𝑡) d𝑡 = ∫(𝐴(,)𝑌)(𝐹‘𝑡) d𝑡)
4	2, 3	syl 17	. . . . . . 7 ⊢ (𝑥 = 𝑌 → ∫(𝐴(,)𝑥)(𝐹‘𝑡) d𝑡 = ∫(𝐴(,)𝑌)(𝐹‘𝑡) d𝑡)
5		ftc1.g	. . . . . . 7 ⊢ 𝐺 = (𝑥 ∈ (𝐴[,]𝐵) ↦ ∫(𝐴(,)𝑥)(𝐹‘𝑡) d𝑡)
6		itgex 25728	. . . . . . 7 ⊢ ∫(𝐴(,)𝑌)(𝐹‘𝑡) d𝑡 ∈ V
7	4, 5, 6	fvmpt 7010	. . . . . 6 ⊢ (𝑌 ∈ (𝐴[,]𝐵) → (𝐺‘𝑌) = ∫(𝐴(,)𝑌)(𝐹‘𝑡) d𝑡)
8	1, 7	syl 17	. . . . 5 ⊢ (𝜑 → (𝐺‘𝑌) = ∫(𝐴(,)𝑌)(𝐹‘𝑡) d𝑡)
9	8	adantr 479	. . . 4 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝐺‘𝑌) = ∫(𝐴(,)𝑌)(𝐹‘𝑡) d𝑡)
10		ftc1.a	. . . . . 6 ⊢ (𝜑 → 𝐴 ∈ ℝ)
11	10	adantr 479	. . . . 5 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → 𝐴 ∈ ℝ)
12		ftc1.b	. . . . . . . 8 ⊢ (𝜑 → 𝐵 ∈ ℝ)
13		iccssre 13448	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,]𝐵) ⊆ ℝ)
14	10, 12, 13	syl2anc 582	. . . . . . 7 ⊢ (𝜑 → (𝐴[,]𝐵) ⊆ ℝ)
15	14, 1	sseldd 3983	. . . . . 6 ⊢ (𝜑 → 𝑌 ∈ ℝ)
16	15	adantr 479	. . . . 5 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → 𝑌 ∈ ℝ)
17		ftc1lem1.x	. . . . . . . 8 ⊢ (𝜑 → 𝑋 ∈ (𝐴[,]𝐵))
18	14, 17	sseldd 3983	. . . . . . 7 ⊢ (𝜑 → 𝑋 ∈ ℝ)
19	18	adantr 479	. . . . . 6 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → 𝑋 ∈ ℝ)
20		elicc2 13431	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑋 ∈ (𝐴[,]𝐵) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝐵)))
21	10, 12, 20	syl2anc 582	. . . . . . . . 9 ⊢ (𝜑 → (𝑋 ∈ (𝐴[,]𝐵) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝐵)))
22	17, 21	mpbid 231	. . . . . . . 8 ⊢ (𝜑 → (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝐵))
23	22	simp2d 1140	. . . . . . 7 ⊢ (𝜑 → 𝐴 ≤ 𝑋)
24	23	adantr 479	. . . . . 6 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → 𝐴 ≤ 𝑋)
25		simpr 483	. . . . . 6 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → 𝑋 ≤ 𝑌)
26		elicc2 13431	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ 𝑌 ∈ ℝ) → (𝑋 ∈ (𝐴[,]𝑌) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝑌)))
27	10, 15, 26	syl2anc 582	. . . . . . 7 ⊢ (𝜑 → (𝑋 ∈ (𝐴[,]𝑌) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝑌)))
28	27	adantr 479	. . . . . 6 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝑋 ∈ (𝐴[,]𝑌) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝑌)))
29	19, 24, 25, 28	mpbir3and 1339	. . . . 5 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → 𝑋 ∈ (𝐴[,]𝑌))
30	12	rexrd 11304	. . . . . . . . . 10 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
31		elicc2 13431	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑌 ∈ (𝐴[,]𝐵) ↔ (𝑌 ∈ ℝ ∧ 𝐴 ≤ 𝑌 ∧ 𝑌 ≤ 𝐵)))
32	10, 12, 31	syl2anc 582	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑌 ∈ (𝐴[,]𝐵) ↔ (𝑌 ∈ ℝ ∧ 𝐴 ≤ 𝑌 ∧ 𝑌 ≤ 𝐵)))
33	1, 32	mpbid 231	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑌 ∈ ℝ ∧ 𝐴 ≤ 𝑌 ∧ 𝑌 ≤ 𝐵))
34	33	simp3d 1141	. . . . . . . . . 10 ⊢ (𝜑 → 𝑌 ≤ 𝐵)
35		iooss2 13402	. . . . . . . . . 10 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝑌 ≤ 𝐵) → (𝐴(,)𝑌) ⊆ (𝐴(,)𝐵))
36	30, 34, 35	syl2anc 582	. . . . . . . . 9 ⊢ (𝜑 → (𝐴(,)𝑌) ⊆ (𝐴(,)𝐵))
37		ftc1.s	. . . . . . . . 9 ⊢ (𝜑 → (𝐴(,)𝐵) ⊆ 𝐷)
38	36, 37	sstrd 3992	. . . . . . . 8 ⊢ (𝜑 → (𝐴(,)𝑌) ⊆ 𝐷)
39	38	adantr 479	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝐴(,)𝑌) ⊆ 𝐷)
40	39	sselda 3982	. . . . . 6 ⊢ (((𝜑 ∧ 𝑋 ≤ 𝑌) ∧ 𝑡 ∈ (𝐴(,)𝑌)) → 𝑡 ∈ 𝐷)
41		ftc1a.f	. . . . . . . 8 ⊢ (𝜑 → 𝐹:𝐷⟶ℂ)
42	41	ffvelcdmda 7099	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑡 ∈ 𝐷) → (𝐹‘𝑡) ∈ ℂ)
43	42	adantlr 713	. . . . . 6 ⊢ (((𝜑 ∧ 𝑋 ≤ 𝑌) ∧ 𝑡 ∈ 𝐷) → (𝐹‘𝑡) ∈ ℂ)
44	40, 43	syldan 589	. . . . 5 ⊢ (((𝜑 ∧ 𝑋 ≤ 𝑌) ∧ 𝑡 ∈ (𝐴(,)𝑌)) → (𝐹‘𝑡) ∈ ℂ)
45	22	simp3d 1141	. . . . . . . . 9 ⊢ (𝜑 → 𝑋 ≤ 𝐵)
46		iooss2 13402	. . . . . . . . 9 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝑋 ≤ 𝐵) → (𝐴(,)𝑋) ⊆ (𝐴(,)𝐵))
47	30, 45, 46	syl2anc 582	. . . . . . . 8 ⊢ (𝜑 → (𝐴(,)𝑋) ⊆ (𝐴(,)𝐵))
48	47, 37	sstrd 3992	. . . . . . 7 ⊢ (𝜑 → (𝐴(,)𝑋) ⊆ 𝐷)
49		ioombl 25522	. . . . . . . 8 ⊢ (𝐴(,)𝑋) ∈ dom vol
50	49	a1i 11	. . . . . . 7 ⊢ (𝜑 → (𝐴(,)𝑋) ∈ dom vol)
51		fvexd 6917	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑡 ∈ 𝐷) → (𝐹‘𝑡) ∈ V)
52	41	feqmptd 6972	. . . . . . . 8 ⊢ (𝜑 → 𝐹 = (𝑡 ∈ 𝐷 ↦ (𝐹‘𝑡)))
53		ftc1.i	. . . . . . . 8 ⊢ (𝜑 → 𝐹 ∈ 𝐿¹)
54	52, 53	eqeltrrd 2830	. . . . . . 7 ⊢ (𝜑 → (𝑡 ∈ 𝐷 ↦ (𝐹‘𝑡)) ∈ 𝐿¹)
55	48, 50, 51, 54	iblss 25762	. . . . . 6 ⊢ (𝜑 → (𝑡 ∈ (𝐴(,)𝑋) ↦ (𝐹‘𝑡)) ∈ 𝐿¹)
56	55	adantr 479	. . . . 5 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝑡 ∈ (𝐴(,)𝑋) ↦ (𝐹‘𝑡)) ∈ 𝐿¹)
57	10	rexrd 11304	. . . . . . . . . 10 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
58		iooss1 13401	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐴 ≤ 𝑋) → (𝑋(,)𝑌) ⊆ (𝐴(,)𝑌))
59	57, 23, 58	syl2anc 582	. . . . . . . . 9 ⊢ (𝜑 → (𝑋(,)𝑌) ⊆ (𝐴(,)𝑌))
60	59, 36	sstrd 3992	. . . . . . . 8 ⊢ (𝜑 → (𝑋(,)𝑌) ⊆ (𝐴(,)𝐵))
61	60, 37	sstrd 3992	. . . . . . 7 ⊢ (𝜑 → (𝑋(,)𝑌) ⊆ 𝐷)
62		ioombl 25522	. . . . . . . 8 ⊢ (𝑋(,)𝑌) ∈ dom vol
63	62	a1i 11	. . . . . . 7 ⊢ (𝜑 → (𝑋(,)𝑌) ∈ dom vol)
64	61, 63, 51, 54	iblss 25762	. . . . . 6 ⊢ (𝜑 → (𝑡 ∈ (𝑋(,)𝑌) ↦ (𝐹‘𝑡)) ∈ 𝐿¹)
65	64	adantr 479	. . . . 5 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝑡 ∈ (𝑋(,)𝑌) ↦ (𝐹‘𝑡)) ∈ 𝐿¹)
66	11, 16, 29, 44, 56, 65	itgsplitioo 25795	. . . 4 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → ∫(𝐴(,)𝑌)(𝐹‘𝑡) d𝑡 = (∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡 + ∫(𝑋(,)𝑌)(𝐹‘𝑡) d𝑡))
67	9, 66	eqtrd 2768	. . 3 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝐺‘𝑌) = (∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡 + ∫(𝑋(,)𝑌)(𝐹‘𝑡) d𝑡))
68		oveq2 7434	. . . . . . 7 ⊢ (𝑥 = 𝑋 → (𝐴(,)𝑥) = (𝐴(,)𝑋))
69		itgeq1 25730	. . . . . . 7 ⊢ ((𝐴(,)𝑥) = (𝐴(,)𝑋) → ∫(𝐴(,)𝑥)(𝐹‘𝑡) d𝑡 = ∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡)
70	68, 69	syl 17	. . . . . 6 ⊢ (𝑥 = 𝑋 → ∫(𝐴(,)𝑥)(𝐹‘𝑡) d𝑡 = ∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡)
71		itgex 25728	. . . . . 6 ⊢ ∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡 ∈ V
72	70, 5, 71	fvmpt 7010	. . . . 5 ⊢ (𝑋 ∈ (𝐴[,]𝐵) → (𝐺‘𝑋) = ∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡)
73	17, 72	syl 17	. . . 4 ⊢ (𝜑 → (𝐺‘𝑋) = ∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡)
74	73	adantr 479	. . 3 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝐺‘𝑋) = ∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡)
75	67, 74	oveq12d 7444	. 2 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → ((𝐺‘𝑌) − (𝐺‘𝑋)) = ((∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡 + ∫(𝑋(,)𝑌)(𝐹‘𝑡) d𝑡) − ∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡))
76		fvexd 6917	. . . . 5 ⊢ ((𝜑 ∧ 𝑡 ∈ (𝐴(,)𝑋)) → (𝐹‘𝑡) ∈ V)
77	76, 55	itgcl 25741	. . . 4 ⊢ (𝜑 → ∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡 ∈ ℂ)
78	61	sselda 3982	. . . . . 6 ⊢ ((𝜑 ∧ 𝑡 ∈ (𝑋(,)𝑌)) → 𝑡 ∈ 𝐷)
79	78, 42	syldan 589	. . . . 5 ⊢ ((𝜑 ∧ 𝑡 ∈ (𝑋(,)𝑌)) → (𝐹‘𝑡) ∈ ℂ)
80	79, 64	itgcl 25741	. . . 4 ⊢ (𝜑 → ∫(𝑋(,)𝑌)(𝐹‘𝑡) d𝑡 ∈ ℂ)
81	77, 80	pncan2d 11613	. . 3 ⊢ (𝜑 → ((∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡 + ∫(𝑋(,)𝑌)(𝐹‘𝑡) d𝑡) − ∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡) = ∫(𝑋(,)𝑌)(𝐹‘𝑡) d𝑡)
82	81	adantr 479	. 2 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → ((∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡 + ∫(𝑋(,)𝑌)(𝐹‘𝑡) d𝑡) − ∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡) = ∫(𝑋(,)𝑌)(𝐹‘𝑡) d𝑡)
83	75, 82	eqtrd 2768	1 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → ((𝐺‘𝑌) − (𝐺‘𝑋)) = ∫(𝑋(,)𝑌)(𝐹‘𝑡) d𝑡)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 Vcvv 3473 ⊆ wss 3949 class class class wbr 5152 ↦ cmpt 5235 dom cdm 5682 ⟶wf 6549 ‘cfv 6553 (class class class)co 7426 ℂcc 11146 ℝcr 11147 + caddc 11151 ℝ^*cxr 11287 ≤ cle 11289 − cmin 11484 (,)cioo 13366 [,]cicc 13369 volcvol 25420 𝐿¹cibl 25574 ∫citg 25575

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2699 ax-rep 5289 ax-sep 5303 ax-nul 5310 ax-pow 5369 ax-pr 5433 ax-un 7748 ax-inf2 9674 ax-cnex 11204 ax-resscn 11205 ax-1cn 11206 ax-icn 11207 ax-addcl 11208 ax-addrcl 11209 ax-mulcl 11210 ax-mulrcl 11211 ax-mulcom 11212 ax-addass 11213 ax-mulass 11214 ax-distr 11215 ax-i2m1 11216 ax-1ne0 11217 ax-1rid 11218 ax-rnegex 11219 ax-rrecex 11220 ax-cnre 11221 ax-pre-lttri 11222 ax-pre-lttrn 11223 ax-pre-ltadd 11224 ax-pre-mulgt0 11225 ax-pre-sup 11226 ax-addf 11227

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2529 df-eu 2558 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3475 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-symdif 4245 df-nul 4327 df-if 4533 df-pw 4608 df-sn 4633 df-pr 4635 df-op 4639 df-uni 4913 df-int 4954 df-iun 5002 df-disj 5118 df-br 5153 df-opab 5215 df-mpt 5236 df-tr 5270 df-id 5580 df-eprel 5586 df-po 5594 df-so 5595 df-fr 5637 df-se 5638 df-we 5639 df-xp 5688 df-rel 5689 df-cnv 5690 df-co 5691 df-dm 5692 df-rn 5693 df-res 5694 df-ima 5695 df-pred 6310 df-ord 6377 df-on 6378 df-lim 6379 df-suc 6380 df-iota 6505 df-fun 6555 df-fn 6556 df-f 6557 df-f1 6558 df-fo 6559 df-f1o 6560 df-fv 6561 df-isom 6562 df-riota 7382 df-ov 7429 df-oprab 7430 df-mpo 7431 df-of 7692 df-ofr 7693 df-om 7879 df-1st 8001 df-2nd 8002 df-frecs 8295 df-wrecs 8326 df-recs 8400 df-rdg 8439 df-1o 8495 df-2o 8496 df-er 8733 df-map 8855 df-pm 8856 df-en 8973 df-dom 8974 df-sdom 8975 df-fin 8976 df-fi 9444 df-sup 9475 df-inf 9476 df-oi 9543 df-dju 9934 df-card 9972 df-pnf 11290 df-mnf 11291 df-xr 11292 df-ltxr 11293 df-le 11294 df-sub 11486 df-neg 11487 df-div 11912 df-nn 12253 df-2 12315 df-3 12316 df-4 12317 df-n0 12513 df-z 12599 df-uz 12863 df-q 12973 df-rp 13017 df-xneg 13134 df-xadd 13135 df-xmul 13136 df-ioo 13370 df-ico 13372 df-icc 13373 df-fz 13527 df-fzo 13670 df-fl 13799 df-mod 13877 df-seq 14009 df-exp 14069 df-hash 14332 df-cj 15088 df-re 15089 df-im 15090 df-sqrt 15224 df-abs 15225 df-clim 15474 df-rlim 15475 df-sum 15675 df-rest 17413 df-topgen 17434 df-psmet 21285 df-xmet 21286 df-met 21287 df-bl 21288 df-mopn 21289 df-top 22824 df-topon 22841 df-bases 22877 df-cmp 23319 df-ovol 25421 df-vol 25422 df-mbf 25576 df-itg1 25577 df-itg2 25578 df-ibl 25579 df-itg 25580 df-0p 25627

This theorem is referenced by: ftc1a 26000 ftc1lem4 26002 ftc1cnnclem 37205

W3C validator