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Theorem ftc1lem1 25543

Description: Lemma for ftc1a 25545 and ftc1 25550. (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 7413	. . . . . . . 8 ⊢ (𝑥 = 𝑌 → (𝐴(,)𝑥) = (𝐴(,)𝑌))
3		itgeq1 25281	. . . . . . . 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 25279	. . . . . . 7 ⊢ ∫(𝐴(,)𝑌)(𝐹‘𝑡) d𝑡 ∈ V
7	4, 5, 6	fvmpt 6995	. . . . . 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 481	. . . 4 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝐺‘𝑌) = ∫(𝐴(,)𝑌)(𝐹‘𝑡) d𝑡)
10		ftc1.a	. . . . . 6 ⊢ (𝜑 → 𝐴 ∈ ℝ)
11	10	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → 𝐴 ∈ ℝ)
12		ftc1.b	. . . . . . . 8 ⊢ (𝜑 → 𝐵 ∈ ℝ)
13		iccssre 13402	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,]𝐵) ⊆ ℝ)
14	10, 12, 13	syl2anc 584	. . . . . . 7 ⊢ (𝜑 → (𝐴[,]𝐵) ⊆ ℝ)
15	14, 1	sseldd 3982	. . . . . 6 ⊢ (𝜑 → 𝑌 ∈ ℝ)
16	15	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → 𝑌 ∈ ℝ)
17		ftc1lem1.x	. . . . . . . 8 ⊢ (𝜑 → 𝑋 ∈ (𝐴[,]𝐵))
18	14, 17	sseldd 3982	. . . . . . 7 ⊢ (𝜑 → 𝑋 ∈ ℝ)
19	18	adantr 481	. . . . . 6 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → 𝑋 ∈ ℝ)
20		elicc2 13385	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑋 ∈ (𝐴[,]𝐵) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝐵)))
21	10, 12, 20	syl2anc 584	. . . . . . . . 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 1143	. . . . . . 7 ⊢ (𝜑 → 𝐴 ≤ 𝑋)
24	23	adantr 481	. . . . . 6 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → 𝐴 ≤ 𝑋)
25		simpr 485	. . . . . 6 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → 𝑋 ≤ 𝑌)
26		elicc2 13385	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ 𝑌 ∈ ℝ) → (𝑋 ∈ (𝐴[,]𝑌) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝑌)))
27	10, 15, 26	syl2anc 584	. . . . . . 7 ⊢ (𝜑 → (𝑋 ∈ (𝐴[,]𝑌) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝑌)))
28	27	adantr 481	. . . . . 6 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝑋 ∈ (𝐴[,]𝑌) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝑌)))
29	19, 24, 25, 28	mpbir3and 1342	. . . . 5 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → 𝑋 ∈ (𝐴[,]𝑌))
30	12	rexrd 11260	. . . . . . . . . 10 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
31		elicc2 13385	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑌 ∈ (𝐴[,]𝐵) ↔ (𝑌 ∈ ℝ ∧ 𝐴 ≤ 𝑌 ∧ 𝑌 ≤ 𝐵)))
32	10, 12, 31	syl2anc 584	. . . . . . . . . . . 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 1144	. . . . . . . . . 10 ⊢ (𝜑 → 𝑌 ≤ 𝐵)
35		iooss2 13356	. . . . . . . . . 10 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝑌 ≤ 𝐵) → (𝐴(,)𝑌) ⊆ (𝐴(,)𝐵))
36	30, 34, 35	syl2anc 584	. . . . . . . . 9 ⊢ (𝜑 → (𝐴(,)𝑌) ⊆ (𝐴(,)𝐵))
37		ftc1.s	. . . . . . . . 9 ⊢ (𝜑 → (𝐴(,)𝐵) ⊆ 𝐷)
38	36, 37	sstrd 3991	. . . . . . . 8 ⊢ (𝜑 → (𝐴(,)𝑌) ⊆ 𝐷)
39	38	adantr 481	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝐴(,)𝑌) ⊆ 𝐷)
40	39	sselda 3981	. . . . . 6 ⊢ (((𝜑 ∧ 𝑋 ≤ 𝑌) ∧ 𝑡 ∈ (𝐴(,)𝑌)) → 𝑡 ∈ 𝐷)
41		ftc1a.f	. . . . . . . 8 ⊢ (𝜑 → 𝐹:𝐷⟶ℂ)
42	41	ffvelcdmda 7083	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑡 ∈ 𝐷) → (𝐹‘𝑡) ∈ ℂ)
43	42	adantlr 713	. . . . . 6 ⊢ (((𝜑 ∧ 𝑋 ≤ 𝑌) ∧ 𝑡 ∈ 𝐷) → (𝐹‘𝑡) ∈ ℂ)
44	40, 43	syldan 591	. . . . 5 ⊢ (((𝜑 ∧ 𝑋 ≤ 𝑌) ∧ 𝑡 ∈ (𝐴(,)𝑌)) → (𝐹‘𝑡) ∈ ℂ)
45	22	simp3d 1144	. . . . . . . . 9 ⊢ (𝜑 → 𝑋 ≤ 𝐵)
46		iooss2 13356	. . . . . . . . 9 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝑋 ≤ 𝐵) → (𝐴(,)𝑋) ⊆ (𝐴(,)𝐵))
47	30, 45, 46	syl2anc 584	. . . . . . . 8 ⊢ (𝜑 → (𝐴(,)𝑋) ⊆ (𝐴(,)𝐵))
48	47, 37	sstrd 3991	. . . . . . 7 ⊢ (𝜑 → (𝐴(,)𝑋) ⊆ 𝐷)
49		ioombl 25073	. . . . . . . 8 ⊢ (𝐴(,)𝑋) ∈ dom vol
50	49	a1i 11	. . . . . . 7 ⊢ (𝜑 → (𝐴(,)𝑋) ∈ dom vol)
51		fvexd 6903	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑡 ∈ 𝐷) → (𝐹‘𝑡) ∈ V)
52	41	feqmptd 6957	. . . . . . . 8 ⊢ (𝜑 → 𝐹 = (𝑡 ∈ 𝐷 ↦ (𝐹‘𝑡)))
53		ftc1.i	. . . . . . . 8 ⊢ (𝜑 → 𝐹 ∈ 𝐿¹)
54	52, 53	eqeltrrd 2834	. . . . . . 7 ⊢ (𝜑 → (𝑡 ∈ 𝐷 ↦ (𝐹‘𝑡)) ∈ 𝐿¹)
55	48, 50, 51, 54	iblss 25313	. . . . . 6 ⊢ (𝜑 → (𝑡 ∈ (𝐴(,)𝑋) ↦ (𝐹‘𝑡)) ∈ 𝐿¹)
56	55	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝑡 ∈ (𝐴(,)𝑋) ↦ (𝐹‘𝑡)) ∈ 𝐿¹)
57	10	rexrd 11260	. . . . . . . . . 10 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
58		iooss1 13355	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐴 ≤ 𝑋) → (𝑋(,)𝑌) ⊆ (𝐴(,)𝑌))
59	57, 23, 58	syl2anc 584	. . . . . . . . 9 ⊢ (𝜑 → (𝑋(,)𝑌) ⊆ (𝐴(,)𝑌))
60	59, 36	sstrd 3991	. . . . . . . 8 ⊢ (𝜑 → (𝑋(,)𝑌) ⊆ (𝐴(,)𝐵))
61	60, 37	sstrd 3991	. . . . . . 7 ⊢ (𝜑 → (𝑋(,)𝑌) ⊆ 𝐷)
62		ioombl 25073	. . . . . . . 8 ⊢ (𝑋(,)𝑌) ∈ dom vol
63	62	a1i 11	. . . . . . 7 ⊢ (𝜑 → (𝑋(,)𝑌) ∈ dom vol)
64	61, 63, 51, 54	iblss 25313	. . . . . 6 ⊢ (𝜑 → (𝑡 ∈ (𝑋(,)𝑌) ↦ (𝐹‘𝑡)) ∈ 𝐿¹)
65	64	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝑡 ∈ (𝑋(,)𝑌) ↦ (𝐹‘𝑡)) ∈ 𝐿¹)
66	11, 16, 29, 44, 56, 65	itgsplitioo 25346	. . . 4 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → ∫(𝐴(,)𝑌)(𝐹‘𝑡) d𝑡 = (∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡 + ∫(𝑋(,)𝑌)(𝐹‘𝑡) d𝑡))
67	9, 66	eqtrd 2772	. . 3 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝐺‘𝑌) = (∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡 + ∫(𝑋(,)𝑌)(𝐹‘𝑡) d𝑡))
68		oveq2 7413	. . . . . . 7 ⊢ (𝑥 = 𝑋 → (𝐴(,)𝑥) = (𝐴(,)𝑋))
69		itgeq1 25281	. . . . . . 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 25279	. . . . . 6 ⊢ ∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡 ∈ V
72	70, 5, 71	fvmpt 6995	. . . . 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 481	. . 3 ⊢ ((𝜑 ∧ 𝑋 ≤ 𝑌) → (𝐺‘𝑋) = ∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡)
75	67, 74	oveq12d 7423	. 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 6903	. . . . 5 ⊢ ((𝜑 ∧ 𝑡 ∈ (𝐴(,)𝑋)) → (𝐹‘𝑡) ∈ V)
77	76, 55	itgcl 25292	. . . 4 ⊢ (𝜑 → ∫(𝐴(,)𝑋)(𝐹‘𝑡) d𝑡 ∈ ℂ)
78	61	sselda 3981	. . . . . 6 ⊢ ((𝜑 ∧ 𝑡 ∈ (𝑋(,)𝑌)) → 𝑡 ∈ 𝐷)
79	78, 42	syldan 591	. . . . 5 ⊢ ((𝜑 ∧ 𝑡 ∈ (𝑋(,)𝑌)) → (𝐹‘𝑡) ∈ ℂ)
80	79, 64	itgcl 25292	. . . 4 ⊢ (𝜑 → ∫(𝑋(,)𝑌)(𝐹‘𝑡) d𝑡 ∈ ℂ)
81	77, 80	pncan2d 11569	. . 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 481	. 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 2772	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 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 Vcvv 3474 ⊆ wss 3947 class class class wbr 5147 ↦ cmpt 5230 dom cdm 5675 ⟶wf 6536 ‘cfv 6540 (class class class)co 7405 ℂcc 11104 ℝcr 11105 + caddc 11109 ℝ^*cxr 11243 ≤ cle 11245 − cmin 11440 (,)cioo 13320 [,]cicc 13323 volcvol 24971 𝐿¹cibl 25125 ∫citg 25126

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-inf2 9632 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 ax-pre-sup 11184 ax-addf 11185

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-symdif 4241 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-int 4950 df-iun 4998 df-disj 5113 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-se 5631 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-isom 6549 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-of 7666 df-ofr 7667 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-2o 8463 df-er 8699 df-map 8818 df-pm 8819 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-fi 9402 df-sup 9433 df-inf 9434 df-oi 9501 df-dju 9892 df-card 9930 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-div 11868 df-nn 12209 df-2 12271 df-3 12272 df-4 12273 df-n0 12469 df-z 12555 df-uz 12819 df-q 12929 df-rp 12971 df-xneg 13088 df-xadd 13089 df-xmul 13090 df-ioo 13324 df-ico 13326 df-icc 13327 df-fz 13481 df-fzo 13624 df-fl 13753 df-mod 13831 df-seq 13963 df-exp 14024 df-hash 14287 df-cj 15042 df-re 15043 df-im 15044 df-sqrt 15178 df-abs 15179 df-clim 15428 df-rlim 15429 df-sum 15629 df-rest 17364 df-topgen 17385 df-psmet 20928 df-xmet 20929 df-met 20930 df-bl 20931 df-mopn 20932 df-top 22387 df-topon 22404 df-bases 22440 df-cmp 22882 df-ovol 24972 df-vol 24973 df-mbf 25127 df-itg1 25128 df-itg2 25129 df-ibl 25130 df-itg 25131 df-0p 25178

This theorem is referenced by: ftc1a 25545 ftc1lem4 25547 ftc1cnnclem 36547

W3C validator