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Theorem mbfaddlem 25168

Description: The sum of two measurable functions is measurable. (Contributed by Mario Carneiro, 15-Aug-2014.)

**Hypotheses**
Ref	Expression
mbfadd.1	⊢ (𝜑 → 𝐹 ∈ MblFn)
mbfadd.2	⊢ (𝜑 → 𝐺 ∈ MblFn)
mbfadd.3	⊢ (𝜑 → 𝐹:𝐴⟶ℝ)
mbfadd.4	⊢ (𝜑 → 𝐺:𝐴⟶ℝ)

**Assertion**
Ref	Expression
mbfaddlem	⊢ (𝜑 → (𝐹 ∘_f + 𝐺) ∈ MblFn)

Proof of Theorem mbfaddlem Dummy variables 𝑟 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		readdcl 11189	. . . 4 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) → (𝑥 + 𝑦) ∈ ℝ)
2	1	adantl 482	. . 3 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ)) → (𝑥 + 𝑦) ∈ ℝ)
3		mbfadd.3	. . 3 ⊢ (𝜑 → 𝐹:𝐴⟶ℝ)
4		mbfadd.4	. . 3 ⊢ (𝜑 → 𝐺:𝐴⟶ℝ)
5	3	fdmd 6725	. . . 4 ⊢ (𝜑 → dom 𝐹 = 𝐴)
6		mbfadd.1	. . . . 5 ⊢ (𝜑 → 𝐹 ∈ MblFn)
7		mbfdm 25134	. . . . 5 ⊢ (𝐹 ∈ MblFn → dom 𝐹 ∈ dom vol)
8	6, 7	syl 17	. . . 4 ⊢ (𝜑 → dom 𝐹 ∈ dom vol)
9	5, 8	eqeltrrd 2834	. . 3 ⊢ (𝜑 → 𝐴 ∈ dom vol)
10		inidm 4217	. . 3 ⊢ (𝐴 ∩ 𝐴) = 𝐴
11	2, 3, 4, 9, 9, 10	off 7684	. 2 ⊢ (𝜑 → (𝐹 ∘_f + 𝐺):𝐴⟶ℝ)
12		eliun 5000	. . . . 5 ⊢ (𝑥 ∈ ∪ 𝑟 ∈ ℚ ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ↔ ∃𝑟 ∈ ℚ 𝑥 ∈ ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))))
13		r19.42v 3190	. . . . . . 7 ⊢ (∃𝑟 ∈ ℚ (𝑥 ∈ 𝐴 ∧ ((𝐹‘𝑥) ∈ (𝑟(,)+∞) ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞))) ↔ (𝑥 ∈ 𝐴 ∧ ∃𝑟 ∈ ℚ ((𝐹‘𝑥) ∈ (𝑟(,)+∞) ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞))))
14		simplr 767	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → 𝑦 ∈ ℝ)
15	4	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → 𝐺:𝐴⟶ℝ)
16	15	ffvelcdmda 7083	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (𝐺‘𝑥) ∈ ℝ)
17	3	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → 𝐹:𝐴⟶ℝ)
18	17	ffvelcdmda 7083	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ ℝ)
19	14, 16, 18	ltsubaddd 11806	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → ((𝑦 − (𝐺‘𝑥)) < (𝐹‘𝑥) ↔ 𝑦 < ((𝐹‘𝑥) + (𝐺‘𝑥))))
20	14	adantr 481	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → 𝑦 ∈ ℝ)
21		qre 12933	. . . . . . . . . . . . . . 15 ⊢ (𝑟 ∈ ℚ → 𝑟 ∈ ℝ)
22	21	adantl 482	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → 𝑟 ∈ ℝ)
23	16	adantr 481	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → (𝐺‘𝑥) ∈ ℝ)
24		ltsub23 11690	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ∈ ℝ ∧ 𝑟 ∈ ℝ ∧ (𝐺‘𝑥) ∈ ℝ) → ((𝑦 − 𝑟) < (𝐺‘𝑥) ↔ (𝑦 − (𝐺‘𝑥)) < 𝑟))
25	20, 22, 23, 24	syl3anc 1371	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → ((𝑦 − 𝑟) < (𝐺‘𝑥) ↔ (𝑦 − (𝐺‘𝑥)) < 𝑟))
26	25	anbi1cd 634	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → ((𝑟 < (𝐹‘𝑥) ∧ (𝑦 − 𝑟) < (𝐺‘𝑥)) ↔ ((𝑦 − (𝐺‘𝑥)) < 𝑟 ∧ 𝑟 < (𝐹‘𝑥))))
27	26	rexbidva 3176	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (∃𝑟 ∈ ℚ (𝑟 < (𝐹‘𝑥) ∧ (𝑦 − 𝑟) < (𝐺‘𝑥)) ↔ ∃𝑟 ∈ ℚ ((𝑦 − (𝐺‘𝑥)) < 𝑟 ∧ 𝑟 < (𝐹‘𝑥))))
28	14, 16	resubcld 11638	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (𝑦 − (𝐺‘𝑥)) ∈ ℝ)
29	28	adantr 481	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → (𝑦 − (𝐺‘𝑥)) ∈ ℝ)
30	18	adantr 481	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → (𝐹‘𝑥) ∈ ℝ)
31		lttr 11286	. . . . . . . . . . . . . 14 ⊢ (((𝑦 − (𝐺‘𝑥)) ∈ ℝ ∧ 𝑟 ∈ ℝ ∧ (𝐹‘𝑥) ∈ ℝ) → (((𝑦 − (𝐺‘𝑥)) < 𝑟 ∧ 𝑟 < (𝐹‘𝑥)) → (𝑦 − (𝐺‘𝑥)) < (𝐹‘𝑥)))
32	29, 22, 30, 31	syl3anc 1371	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → (((𝑦 − (𝐺‘𝑥)) < 𝑟 ∧ 𝑟 < (𝐹‘𝑥)) → (𝑦 − (𝐺‘𝑥)) < (𝐹‘𝑥)))
33	32	rexlimdva 3155	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (∃𝑟 ∈ ℚ ((𝑦 − (𝐺‘𝑥)) < 𝑟 ∧ 𝑟 < (𝐹‘𝑥)) → (𝑦 − (𝐺‘𝑥)) < (𝐹‘𝑥)))
34		qbtwnre 13174	. . . . . . . . . . . . . 14 ⊢ (((𝑦 − (𝐺‘𝑥)) ∈ ℝ ∧ (𝐹‘𝑥) ∈ ℝ ∧ (𝑦 − (𝐺‘𝑥)) < (𝐹‘𝑥)) → ∃𝑟 ∈ ℚ ((𝑦 − (𝐺‘𝑥)) < 𝑟 ∧ 𝑟 < (𝐹‘𝑥)))
35	34	3expia 1121	. . . . . . . . . . . . 13 ⊢ (((𝑦 − (𝐺‘𝑥)) ∈ ℝ ∧ (𝐹‘𝑥) ∈ ℝ) → ((𝑦 − (𝐺‘𝑥)) < (𝐹‘𝑥) → ∃𝑟 ∈ ℚ ((𝑦 − (𝐺‘𝑥)) < 𝑟 ∧ 𝑟 < (𝐹‘𝑥))))
36	28, 18, 35	syl2anc 584	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → ((𝑦 − (𝐺‘𝑥)) < (𝐹‘𝑥) → ∃𝑟 ∈ ℚ ((𝑦 − (𝐺‘𝑥)) < 𝑟 ∧ 𝑟 < (𝐹‘𝑥))))
37	33, 36	impbid 211	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (∃𝑟 ∈ ℚ ((𝑦 − (𝐺‘𝑥)) < 𝑟 ∧ 𝑟 < (𝐹‘𝑥)) ↔ (𝑦 − (𝐺‘𝑥)) < (𝐹‘𝑥)))
38	27, 37	bitrd 278	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (∃𝑟 ∈ ℚ (𝑟 < (𝐹‘𝑥) ∧ (𝑦 − 𝑟) < (𝐺‘𝑥)) ↔ (𝑦 − (𝐺‘𝑥)) < (𝐹‘𝑥)))
39	3	ffnd 6715	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐹 Fn 𝐴)
40	39	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → 𝐹 Fn 𝐴)
41	4	ffnd 6715	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐺 Fn 𝐴)
42	41	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → 𝐺 Fn 𝐴)
43	9	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → 𝐴 ∈ dom vol)
44		eqidd 2733	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) = (𝐹‘𝑥))
45		eqidd 2733	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (𝐺‘𝑥) = (𝐺‘𝑥))
46	40, 42, 43, 43, 10, 44, 45	ofval 7677	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → ((𝐹 ∘_f + 𝐺)‘𝑥) = ((𝐹‘𝑥) + (𝐺‘𝑥)))
47	46	breq2d 5159	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (𝑦 < ((𝐹 ∘_f + 𝐺)‘𝑥) ↔ 𝑦 < ((𝐹‘𝑥) + (𝐺‘𝑥))))
48	19, 38, 47	3bitr4d 310	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (∃𝑟 ∈ ℚ (𝑟 < (𝐹‘𝑥) ∧ (𝑦 − 𝑟) < (𝐺‘𝑥)) ↔ 𝑦 < ((𝐹 ∘_f + 𝐺)‘𝑥)))
49	22	rexrd 11260	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → 𝑟 ∈ ℝ^*)
50		elioopnf 13416	. . . . . . . . . . . . 13 ⊢ (𝑟 ∈ ℝ^* → ((𝐹‘𝑥) ∈ (𝑟(,)+∞) ↔ ((𝐹‘𝑥) ∈ ℝ ∧ 𝑟 < (𝐹‘𝑥))))
51	49, 50	syl 17	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → ((𝐹‘𝑥) ∈ (𝑟(,)+∞) ↔ ((𝐹‘𝑥) ∈ ℝ ∧ 𝑟 < (𝐹‘𝑥))))
52	30, 51	mpbirand 705	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → ((𝐹‘𝑥) ∈ (𝑟(,)+∞) ↔ 𝑟 < (𝐹‘𝑥)))
53	20, 22	resubcld 11638	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → (𝑦 − 𝑟) ∈ ℝ)
54	53	rexrd 11260	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → (𝑦 − 𝑟) ∈ ℝ^*)
55		elioopnf 13416	. . . . . . . . . . . . 13 ⊢ ((𝑦 − 𝑟) ∈ ℝ^* → ((𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞) ↔ ((𝐺‘𝑥) ∈ ℝ ∧ (𝑦 − 𝑟) < (𝐺‘𝑥))))
56	54, 55	syl 17	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → ((𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞) ↔ ((𝐺‘𝑥) ∈ ℝ ∧ (𝑦 − 𝑟) < (𝐺‘𝑥))))
57	23, 56	mpbirand 705	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → ((𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞) ↔ (𝑦 − 𝑟) < (𝐺‘𝑥)))
58	52, 57	anbi12d 631	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) ∧ 𝑟 ∈ ℚ) → (((𝐹‘𝑥) ∈ (𝑟(,)+∞) ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞)) ↔ (𝑟 < (𝐹‘𝑥) ∧ (𝑦 − 𝑟) < (𝐺‘𝑥))))
59	58	rexbidva 3176	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (∃𝑟 ∈ ℚ ((𝐹‘𝑥) ∈ (𝑟(,)+∞) ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞)) ↔ ∃𝑟 ∈ ℚ (𝑟 < (𝐹‘𝑥) ∧ (𝑦 − 𝑟) < (𝐺‘𝑥))))
60	11	adantr 481	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (𝐹 ∘_f + 𝐺):𝐴⟶ℝ)
61	60	ffvelcdmda 7083	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → ((𝐹 ∘_f + 𝐺)‘𝑥) ∈ ℝ)
62	14	rexrd 11260	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → 𝑦 ∈ ℝ^*)
63		elioopnf 13416	. . . . . . . . . . 11 ⊢ (𝑦 ∈ ℝ^* → (((𝐹 ∘_f + 𝐺)‘𝑥) ∈ (𝑦(,)+∞) ↔ (((𝐹 ∘_f + 𝐺)‘𝑥) ∈ ℝ ∧ 𝑦 < ((𝐹 ∘_f + 𝐺)‘𝑥))))
64	62, 63	syl 17	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (((𝐹 ∘_f + 𝐺)‘𝑥) ∈ (𝑦(,)+∞) ↔ (((𝐹 ∘_f + 𝐺)‘𝑥) ∈ ℝ ∧ 𝑦 < ((𝐹 ∘_f + 𝐺)‘𝑥))))
65	61, 64	mpbirand 705	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (((𝐹 ∘_f + 𝐺)‘𝑥) ∈ (𝑦(,)+∞) ↔ 𝑦 < ((𝐹 ∘_f + 𝐺)‘𝑥)))
66	48, 59, 65	3bitr4d 310	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑥 ∈ 𝐴) → (∃𝑟 ∈ ℚ ((𝐹‘𝑥) ∈ (𝑟(,)+∞) ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞)) ↔ ((𝐹 ∘_f + 𝐺)‘𝑥) ∈ (𝑦(,)+∞)))
67	66	pm5.32da 579	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → ((𝑥 ∈ 𝐴 ∧ ∃𝑟 ∈ ℚ ((𝐹‘𝑥) ∈ (𝑟(,)+∞) ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞))) ↔ (𝑥 ∈ 𝐴 ∧ ((𝐹 ∘_f + 𝐺)‘𝑥) ∈ (𝑦(,)+∞))))
68	13, 67	bitrid 282	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (∃𝑟 ∈ ℚ (𝑥 ∈ 𝐴 ∧ ((𝐹‘𝑥) ∈ (𝑟(,)+∞) ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞))) ↔ (𝑥 ∈ 𝐴 ∧ ((𝐹 ∘_f + 𝐺)‘𝑥) ∈ (𝑦(,)+∞))))
69		elpreima 7056	. . . . . . . . . 10 ⊢ (𝐹 Fn 𝐴 → (𝑥 ∈ (^◡𝐹 “ (𝑟(,)+∞)) ↔ (𝑥 ∈ 𝐴 ∧ (𝐹‘𝑥) ∈ (𝑟(,)+∞))))
70	40, 69	syl 17	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (𝑥 ∈ (^◡𝐹 “ (𝑟(,)+∞)) ↔ (𝑥 ∈ 𝐴 ∧ (𝐹‘𝑥) ∈ (𝑟(,)+∞))))
71		elpreima 7056	. . . . . . . . . 10 ⊢ (𝐺 Fn 𝐴 → (𝑥 ∈ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞)) ↔ (𝑥 ∈ 𝐴 ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞))))
72	42, 71	syl 17	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (𝑥 ∈ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞)) ↔ (𝑥 ∈ 𝐴 ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞))))
73	70, 72	anbi12d 631	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → ((𝑥 ∈ (^◡𝐹 “ (𝑟(,)+∞)) ∧ 𝑥 ∈ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ↔ ((𝑥 ∈ 𝐴 ∧ (𝐹‘𝑥) ∈ (𝑟(,)+∞)) ∧ (𝑥 ∈ 𝐴 ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞)))))
74		elin 3963	. . . . . . . 8 ⊢ (𝑥 ∈ ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ↔ (𝑥 ∈ (^◡𝐹 “ (𝑟(,)+∞)) ∧ 𝑥 ∈ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))))
75		anandi 674	. . . . . . . 8 ⊢ ((𝑥 ∈ 𝐴 ∧ ((𝐹‘𝑥) ∈ (𝑟(,)+∞) ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞))) ↔ ((𝑥 ∈ 𝐴 ∧ (𝐹‘𝑥) ∈ (𝑟(,)+∞)) ∧ (𝑥 ∈ 𝐴 ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞))))
76	73, 74, 75	3bitr4g 313	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (𝑥 ∈ ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ↔ (𝑥 ∈ 𝐴 ∧ ((𝐹‘𝑥) ∈ (𝑟(,)+∞) ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞)))))
77	76	rexbidv 3178	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (∃𝑟 ∈ ℚ 𝑥 ∈ ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ↔ ∃𝑟 ∈ ℚ (𝑥 ∈ 𝐴 ∧ ((𝐹‘𝑥) ∈ (𝑟(,)+∞) ∧ (𝐺‘𝑥) ∈ ((𝑦 − 𝑟)(,)+∞)))))
78	11	ffnd 6715	. . . . . . . 8 ⊢ (𝜑 → (𝐹 ∘_f + 𝐺) Fn 𝐴)
79	78	adantr 481	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (𝐹 ∘_f + 𝐺) Fn 𝐴)
80		elpreima 7056	. . . . . . 7 ⊢ ((𝐹 ∘_f + 𝐺) Fn 𝐴 → (𝑥 ∈ (^◡(𝐹 ∘_f + 𝐺) “ (𝑦(,)+∞)) ↔ (𝑥 ∈ 𝐴 ∧ ((𝐹 ∘_f + 𝐺)‘𝑥) ∈ (𝑦(,)+∞))))
81	79, 80	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (𝑥 ∈ (^◡(𝐹 ∘_f + 𝐺) “ (𝑦(,)+∞)) ↔ (𝑥 ∈ 𝐴 ∧ ((𝐹 ∘_f + 𝐺)‘𝑥) ∈ (𝑦(,)+∞))))
82	68, 77, 81	3bitr4d 310	. . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (∃𝑟 ∈ ℚ 𝑥 ∈ ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ↔ 𝑥 ∈ (^◡(𝐹 ∘_f + 𝐺) “ (𝑦(,)+∞))))
83	12, 82	bitrid 282	. . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (𝑥 ∈ ∪ 𝑟 ∈ ℚ ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ↔ 𝑥 ∈ (^◡(𝐹 ∘_f + 𝐺) “ (𝑦(,)+∞))))
84	83	eqrdv 2730	. . 3 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → ∪ 𝑟 ∈ ℚ ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) = (^◡(𝐹 ∘_f + 𝐺) “ (𝑦(,)+∞)))
85		qnnen 16152	. . . . 5 ⊢ ℚ ≈ ℕ
86		endom 8971	. . . . 5 ⊢ (ℚ ≈ ℕ → ℚ ≼ ℕ)
87	85, 86	ax-mp 5	. . . 4 ⊢ ℚ ≼ ℕ
88		mbfima 25138	. . . . . . . 8 ⊢ ((𝐹 ∈ MblFn ∧ 𝐹:𝐴⟶ℝ) → (^◡𝐹 “ (𝑟(,)+∞)) ∈ dom vol)
89	6, 3, 88	syl2anc 584	. . . . . . 7 ⊢ (𝜑 → (^◡𝐹 “ (𝑟(,)+∞)) ∈ dom vol)
90		mbfadd.2	. . . . . . . 8 ⊢ (𝜑 → 𝐺 ∈ MblFn)
91		mbfima 25138	. . . . . . . 8 ⊢ ((𝐺 ∈ MblFn ∧ 𝐺:𝐴⟶ℝ) → (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞)) ∈ dom vol)
92	90, 4, 91	syl2anc 584	. . . . . . 7 ⊢ (𝜑 → (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞)) ∈ dom vol)
93		inmbl 25050	. . . . . . 7 ⊢ (((^◡𝐹 “ (𝑟(,)+∞)) ∈ dom vol ∧ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞)) ∈ dom vol) → ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ∈ dom vol)
94	89, 92, 93	syl2anc 584	. . . . . 6 ⊢ (𝜑 → ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ∈ dom vol)
95	94	ad2antrr 724	. . . . 5 ⊢ (((𝜑 ∧ 𝑦 ∈ ℝ) ∧ 𝑟 ∈ ℚ) → ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ∈ dom vol)
96	95	ralrimiva 3146	. . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → ∀𝑟 ∈ ℚ ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ∈ dom vol)
97		iunmbl2 25065	. . . 4 ⊢ ((ℚ ≼ ℕ ∧ ∀𝑟 ∈ ℚ ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ∈ dom vol) → ∪ 𝑟 ∈ ℚ ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ∈ dom vol)
98	87, 96, 97	sylancr 587	. . 3 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → ∪ 𝑟 ∈ ℚ ((^◡𝐹 “ (𝑟(,)+∞)) ∩ (^◡𝐺 “ ((𝑦 − 𝑟)(,)+∞))) ∈ dom vol)
99	84, 98	eqeltrrd 2834	. 2 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (^◡(𝐹 ∘_f + 𝐺) “ (𝑦(,)+∞)) ∈ dom vol)
100	11, 99	ismbf3d 25162	1 ⊢ (𝜑 → (𝐹 ∘_f + 𝐺) ∈ MblFn)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∈ wcel 2106 ∀wral 3061 ∃wrex 3070 ∩ cin 3946 ∪ ciun 4996 class class class wbr 5147 ^◡ccnv 5674 dom cdm 5675 “ cima 5678 Fn wfn 6535 ⟶wf 6536 ‘cfv 6540 (class class class)co 7405 ∘_f cof 7664 ≈ cen 8932 ≼ cdom 8933 ℝcr 11105 + caddc 11109 +∞cpnf 11241 ℝ^*cxr 11243 < clt 11244 − cmin 11440 ℕcn 12208 ℚcq 12928 (,)cioo 13320 volcvol 24971 MblFncmbf 25122

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-cc 10426 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

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-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-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-oadd 8466 df-omul 8467 df-er 8699 df-map 8818 df-pm 8819 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-sup 9433 df-inf 9434 df-oi 9501 df-dju 9892 df-card 9930 df-acn 9933 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-n0 12469 df-z 12555 df-uz 12819 df-q 12929 df-rp 12971 df-xadd 13089 df-ioo 13324 df-ioc 13325 df-ico 13326 df-icc 13327 df-fz 13481 df-fzo 13624 df-fl 13753 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-xmet 20929 df-met 20930 df-ovol 24972 df-vol 24973 df-mbf 25127

This theorem is referenced by: mbfadd 25169

W3C validator