smfliminflem - Mathbox for Glauco Siliprandi

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Theorem smfliminflem 43194

Description: The inferior limit of a countable set of sigma-measurable functions is sigma-measurable. Proposition 121F (e) of [Fremlin1] p. 39 . (Contributed by Glauco Siliprandi, 2-Jan-2022.)

**Hypotheses**
Ref	Expression
smfliminflem.m	⊢ (𝜑 → 𝑀 ∈ ℤ)
smfliminflem.z	⊢ 𝑍 = (ℤ_≥‘𝑀)
smfliminflem.s	⊢ (𝜑 → 𝑆 ∈ SAlg)
smfliminflem.f	⊢ (𝜑 → 𝐹:𝑍⟶(SMblFn‘𝑆))
smfliminflem.d	⊢ 𝐷 = {𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∣ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ}
smfliminflem.g	⊢ 𝐺 = (𝑥 ∈ 𝐷 ↦ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))))

**Assertion**
Ref	Expression
smfliminflem	⊢ (𝜑 → 𝐺 ∈ (SMblFn‘𝑆))

Distinct variable groups: 𝑥,𝐷 𝑛,𝐹,𝑥 𝑚,𝑀 𝑆,𝑚 𝑚,𝑍,𝑛,𝑥 𝜑,𝑚,𝑛,𝑥 Allowed substitution hints: 𝐷(𝑚,𝑛) 𝑆(𝑥,𝑛) 𝐹(𝑚) 𝐺(𝑥,𝑚,𝑛) 𝑀(𝑥,𝑛)

**Proof of Theorem smfliminflem**
Step	Hyp	Ref	Expression
1		smfliminflem.g	. . . 4 ⊢ 𝐺 = (𝑥 ∈ 𝐷 ↦ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))))
2	1	a1i 11	. . 3 ⊢ (𝜑 → 𝐺 = (𝑥 ∈ 𝐷 ↦ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥)))))
3		smfliminflem.d	. . . . . . . . . 10 ⊢ 𝐷 = {𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∣ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ}
4		ssrab2 4044	. . . . . . . . . 10 ⊢ {𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∣ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ} ⊆ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚)
5	3, 4	eqsstri 3989	. . . . . . . . 9 ⊢ 𝐷 ⊆ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚)
6		id 22	. . . . . . . . 9 ⊢ (𝑥 ∈ 𝐷 → 𝑥 ∈ 𝐷)
7	5, 6	sseldi 3953	. . . . . . . 8 ⊢ (𝑥 ∈ 𝐷 → 𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚))
8		smfliminflem.z	. . . . . . . . 9 ⊢ 𝑍 = (ℤ_≥‘𝑀)
9		eqid 2821	. . . . . . . . 9 ⊢ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) = ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚)
10	8, 9	allbutfi 41755	. . . . . . . 8 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ↔ ∃𝑛 ∈ 𝑍 ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚))
11	7, 10	sylib 220	. . . . . . 7 ⊢ (𝑥 ∈ 𝐷 → ∃𝑛 ∈ 𝑍 ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚))
12	11	adantl 484	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → ∃𝑛 ∈ 𝑍 ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚))
13		nfv 1915	. . . . . . . . . 10 ⊢ Ⅎ𝑚(𝜑 ∧ 𝑛 ∈ 𝑍)
14		nfra1 3219	. . . . . . . . . 10 ⊢ Ⅎ𝑚∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚)
15	13, 14	nfan 1900	. . . . . . . . 9 ⊢ Ⅎ𝑚((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚))
16	8	fvexi 6670	. . . . . . . . . 10 ⊢ 𝑍 ∈ V
17	16	a1i 11	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚)) → 𝑍 ∈ V)
18	8	eluzelz2 41766	. . . . . . . . . . 11 ⊢ (𝑛 ∈ 𝑍 → 𝑛 ∈ ℤ)
19	18	zred 12074	. . . . . . . . . 10 ⊢ (𝑛 ∈ 𝑍 → 𝑛 ∈ ℝ)
20	19	ad2antlr 725	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚)) → 𝑛 ∈ ℝ)
21		simpll 765	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚)) → 𝜑)
22		elinel1 4160	. . . . . . . . . . 11 ⊢ (𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞)) → 𝑚 ∈ 𝑍)
23		smfliminflem.s	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑆 ∈ SAlg)
24	23	adantr 483	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑚 ∈ 𝑍) → 𝑆 ∈ SAlg)
25		smfliminflem.f	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐹:𝑍⟶(SMblFn‘𝑆))
26	25	ffvelrnda 6837	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑚 ∈ 𝑍) → (𝐹‘𝑚) ∈ (SMblFn‘𝑆))
27		eqid 2821	. . . . . . . . . . . 12 ⊢ dom (𝐹‘𝑚) = dom (𝐹‘𝑚)
28	24, 26, 27	smff 43099	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑚 ∈ 𝑍) → (𝐹‘𝑚):dom (𝐹‘𝑚)⟶ℝ)
29	21, 22, 28	syl2an 597	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚)) ∧ 𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞))) → (𝐹‘𝑚):dom (𝐹‘𝑚)⟶ℝ)
30		simplr 767	. . . . . . . . . . . 12 ⊢ (((𝑛 ∈ 𝑍 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚)) ∧ 𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞))) → ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚))
31		eqid 2821	. . . . . . . . . . . . . 14 ⊢ (ℤ_≥‘𝑛) = (ℤ_≥‘𝑛)
32	18	adantr 483	. . . . . . . . . . . . . 14 ⊢ ((𝑛 ∈ 𝑍 ∧ 𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞))) → 𝑛 ∈ ℤ)
33	8, 22	eluzelz2d 41777	. . . . . . . . . . . . . . 15 ⊢ (𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞)) → 𝑚 ∈ ℤ)
34	33	adantl 484	. . . . . . . . . . . . . 14 ⊢ ((𝑛 ∈ 𝑍 ∧ 𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞))) → 𝑚 ∈ ℤ)
35	19	rexrd 10677	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 ∈ 𝑍 → 𝑛 ∈ ℝ^*)
36	35	adantr 483	. . . . . . . . . . . . . . 15 ⊢ ((𝑛 ∈ 𝑍 ∧ 𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞))) → 𝑛 ∈ ℝ^*)
37		pnfxr 10681	. . . . . . . . . . . . . . . 16 ⊢ +∞ ∈ ℝ^*
38	37	a1i 11	. . . . . . . . . . . . . . 15 ⊢ ((𝑛 ∈ 𝑍 ∧ 𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞))) → +∞ ∈ ℝ^*)
39		elinel2 4161	. . . . . . . . . . . . . . . 16 ⊢ (𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞)) → 𝑚 ∈ (𝑛[,)+∞))
40	39	adantl 484	. . . . . . . . . . . . . . 15 ⊢ ((𝑛 ∈ 𝑍 ∧ 𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞))) → 𝑚 ∈ (𝑛[,)+∞))
41	36, 38, 40	icogelbd 41924	. . . . . . . . . . . . . 14 ⊢ ((𝑛 ∈ 𝑍 ∧ 𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞))) → 𝑛 ≤ 𝑚)
42	31, 32, 34, 41	eluzd 41772	. . . . . . . . . . . . 13 ⊢ ((𝑛 ∈ 𝑍 ∧ 𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞))) → 𝑚 ∈ (ℤ_≥‘𝑛))
43	42	adantlr 713	. . . . . . . . . . . 12 ⊢ (((𝑛 ∈ 𝑍 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚)) ∧ 𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞))) → 𝑚 ∈ (ℤ_≥‘𝑛))
44		rspa 3206	. . . . . . . . . . . 12 ⊢ ((∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚) ∧ 𝑚 ∈ (ℤ_≥‘𝑛)) → 𝑥 ∈ dom (𝐹‘𝑚))
45	30, 43, 44	syl2anc 586	. . . . . . . . . . 11 ⊢ (((𝑛 ∈ 𝑍 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚)) ∧ 𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞))) → 𝑥 ∈ dom (𝐹‘𝑚))
46	45	adantlll 716	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚)) ∧ 𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞))) → 𝑥 ∈ dom (𝐹‘𝑚))
47	29, 46	ffvelrnd 6838	. . . . . . . . 9 ⊢ ((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚)) ∧ 𝑚 ∈ (𝑍 ∩ (𝑛[,)+∞))) → ((𝐹‘𝑚)‘𝑥) ∈ ℝ)
48	15, 17, 20, 47	liminfval4 42160	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚)) → (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))))
49	48	rexlimdva2 3287	. . . . . . 7 ⊢ (𝜑 → (∃𝑛 ∈ 𝑍 ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚) → (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥)))))
50	49	adantr 483	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → (∃𝑛 ∈ 𝑍 ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚) → (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥)))))
51	12, 50	mpd 15	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))))
52	51	xnegeqd 41801	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → -_𝑒(lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒-_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))))
53	16	mptex 6972	. . . . . . . . . . . 12 ⊢ (𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥)) ∈ V
54	53	limsupcli 42128	. . . . . . . . . . 11 ⊢ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ^*
55	54	xnegnegi 41803	. . . . . . . . . 10 ⊢ -_𝑒-_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) = (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥)))
56	55	a1i 11	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → -_𝑒-_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) = (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))))
57	52, 56	eqtr2d 2857	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))))
58	3	rabeq2i 3479	. . . . . . . . . . 11 ⊢ (𝑥 ∈ 𝐷 ↔ (𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∧ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ))
59	58	simprbi 499	. . . . . . . . . 10 ⊢ (𝑥 ∈ 𝐷 → (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ)
60	59	adantl 484	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ)
61	60	rexnegd 41502	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → -_𝑒(lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -(lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))))
62	57, 61	eqtr2d 2857	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → -(lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))))
63	60	renegcld 11053	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → -(lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ)
64	62, 63	eqeltrrd 2914	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ)
65	64	rexnegd 41502	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) = -(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))))
66	51, 65	eqtrd 2856	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))))
67	66	mpteq2dva 5147	. . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐷 ↦ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥)))) = (𝑥 ∈ 𝐷 ↦ -(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥)))))
68	2, 67	eqtrd 2856	. 2 ⊢ (𝜑 → 𝐺 = (𝑥 ∈ 𝐷 ↦ -(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥)))))
69		nfv 1915	. . 3 ⊢ Ⅎ𝑥𝜑
70	18, 31	uzn0d 41789	. . . . . . . 8 ⊢ (𝑛 ∈ 𝑍 → (ℤ_≥‘𝑛) ≠ ∅)
71		fvex 6669	. . . . . . . . . . 11 ⊢ (𝐹‘𝑚) ∈ V
72	71	dmex 7602	. . . . . . . . . 10 ⊢ dom (𝐹‘𝑚) ∈ V
73	72	rgenw 3150	. . . . . . . . 9 ⊢ ∀𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∈ V
74	73	a1i 11	. . . . . . . 8 ⊢ (𝑛 ∈ 𝑍 → ∀𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∈ V)
75		iinexg 5230	. . . . . . . 8 ⊢ (((ℤ_≥‘𝑛) ≠ ∅ ∧ ∀𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∈ V) → ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∈ V)
76	70, 74, 75	syl2anc 586	. . . . . . 7 ⊢ (𝑛 ∈ 𝑍 → ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∈ V)
77	76	rgen 3148	. . . . . 6 ⊢ ∀𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∈ V
78		iunexg 7650	. . . . . 6 ⊢ ((𝑍 ∈ V ∧ ∀𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∈ V) → ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∈ V)
79	16, 77, 78	mp2an 690	. . . . 5 ⊢ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∈ V
80	79, 5	ssexi 5212	. . . 4 ⊢ 𝐷 ∈ V
81	80	a1i 11	. . 3 ⊢ (𝜑 → 𝐷 ∈ V)
82	3	a1i 11	. . . . . 6 ⊢ (𝜑 → 𝐷 = {𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∣ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ})
83	10	biimpi 218	. . . . . . . . 9 ⊢ (𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) → ∃𝑛 ∈ 𝑍 ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚))
84	49	imp 409	. . . . . . . . 9 ⊢ ((𝜑 ∧ ∃𝑛 ∈ 𝑍 ∀𝑚 ∈ (ℤ_≥‘𝑛)𝑥 ∈ dom (𝐹‘𝑚)) → (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))))
85	83, 84	sylan2 594	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚)) → (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))))
86	54	a1i 11	. . . . . . . . . 10 ⊢ (((lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∧ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ) → (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ^*)
87		simpl 485	. . . . . . . . . . 11 ⊢ (((lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∧ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ) → (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))))
88		simpr 487	. . . . . . . . . . 11 ⊢ (((lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∧ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ) → (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ)
89	87, 88	eqeltrrd 2914	. . . . . . . . . 10 ⊢ (((lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∧ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ) → -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ)
90		xnegrecl2 41826	. . . . . . . . . 10 ⊢ (((lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ^* ∧ -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ) → (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ)
91	86, 89, 90	syl2anc 586	. . . . . . . . 9 ⊢ (((lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∧ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ) → (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ)
92		simpl 485	. . . . . . . . . 10 ⊢ (((lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∧ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ) → (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))))
93		xnegrecl 41802	. . . . . . . . . . 11 ⊢ ((lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ → -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ)
94	93	adantl 484	. . . . . . . . . 10 ⊢ (((lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∧ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ) → -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ)
95	92, 94	eqeltrd 2913	. . . . . . . . 9 ⊢ (((lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∧ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ) → (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ)
96	91, 95	impbida 799	. . . . . . . 8 ⊢ ((lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) = -_𝑒(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) → ((lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ ↔ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ))
97	85, 96	syl 17	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚)) → ((lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ ↔ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ))
98	97	rabbidva 3470	. . . . . 6 ⊢ (𝜑 → {𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∣ (lim inf‘(𝑚 ∈ 𝑍 ↦ ((𝐹‘𝑚)‘𝑥))) ∈ ℝ} = {𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∣ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ})
99	82, 98	eqtrd 2856	. . . . 5 ⊢ (𝜑 → 𝐷 = {𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∣ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ})
100	69, 99	mpteq1df 41596	. . . 4 ⊢ (𝜑 → (𝑥 ∈ 𝐷 ↦ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥)))) = (𝑥 ∈ {𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∣ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ} ↦ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥)))))
101		nfv 1915	. . . . 5 ⊢ Ⅎ𝑚𝜑
102		nfv 1915	. . . . 5 ⊢ Ⅎ𝑛𝜑
103		smfliminflem.m	. . . . 5 ⊢ (𝜑 → 𝑀 ∈ ℤ)
104		negex 10870	. . . . . 6 ⊢ -((𝐹‘𝑚)‘𝑥) ∈ V
105	104	a1i 11	. . . . 5 ⊢ ((𝜑 ∧ 𝑚 ∈ 𝑍 ∧ 𝑥 ∈ dom (𝐹‘𝑚)) → -((𝐹‘𝑚)‘𝑥) ∈ V)
106		nfv 1915	. . . . . 6 ⊢ Ⅎ𝑥(𝜑 ∧ 𝑚 ∈ 𝑍)
107	72	a1i 11	. . . . . 6 ⊢ ((𝜑 ∧ 𝑚 ∈ 𝑍) → dom (𝐹‘𝑚) ∈ V)
108	28	ffvelrnda 6837	. . . . . 6 ⊢ (((𝜑 ∧ 𝑚 ∈ 𝑍) ∧ 𝑥 ∈ dom (𝐹‘𝑚)) → ((𝐹‘𝑚)‘𝑥) ∈ ℝ)
109	28	feqmptd 6719	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑚 ∈ 𝑍) → (𝐹‘𝑚) = (𝑥 ∈ dom (𝐹‘𝑚) ↦ ((𝐹‘𝑚)‘𝑥)))
110	109, 26	eqeltrrd 2914	. . . . . 6 ⊢ ((𝜑 ∧ 𝑚 ∈ 𝑍) → (𝑥 ∈ dom (𝐹‘𝑚) ↦ ((𝐹‘𝑚)‘𝑥)) ∈ (SMblFn‘𝑆))
111	106, 24, 107, 108, 110	smfneg 43168	. . . . 5 ⊢ ((𝜑 ∧ 𝑚 ∈ 𝑍) → (𝑥 ∈ dom (𝐹‘𝑚) ↦ -((𝐹‘𝑚)‘𝑥)) ∈ (SMblFn‘𝑆))
112		eqid 2821	. . . . 5 ⊢ {𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∣ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ} = {𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∣ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ}
113		eqid 2821	. . . . 5 ⊢ (𝑥 ∈ {𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∣ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ} ↦ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥)))) = (𝑥 ∈ {𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∣ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ} ↦ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))))
114	101, 69, 102, 103, 8, 23, 105, 111, 112, 113	smflimsupmpt 43193	. . . 4 ⊢ (𝜑 → (𝑥 ∈ {𝑥 ∈ ∪ 𝑛 ∈ 𝑍 ∩ 𝑚 ∈ (ℤ_≥‘𝑛)dom (𝐹‘𝑚) ∣ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥))) ∈ ℝ} ↦ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥)))) ∈ (SMblFn‘𝑆))
115	100, 114	eqeltrd 2913	. . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐷 ↦ (lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥)))) ∈ (SMblFn‘𝑆))
116	69, 23, 81, 64, 115	smfneg 43168	. 2 ⊢ (𝜑 → (𝑥 ∈ 𝐷 ↦ -(lim sup‘(𝑚 ∈ 𝑍 ↦ -((𝐹‘𝑚)‘𝑥)))) ∈ (SMblFn‘𝑆))
117	68, 116	eqeltrd 2913	1 ⊢ (𝜑 → 𝐺 ∈ (SMblFn‘𝑆))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∧ w3a 1083 = wceq 1537 ∈ wcel 2114 ≠ wne 3016 ∀wral 3138 ∃wrex 3139 {crab 3142 Vcvv 3486 ∩ cin 3923 ∅c0 4279 ∪ ciun 4905 ∩ ciin 4906 ↦ cmpt 5132 dom cdm 5541 ⟶wf 6337 ‘cfv 6341 (class class class)co 7142 ℝcr 10522 +∞cpnf 10658 ℝ^*cxr 10660 -cneg 10857 ℤcz 11968 ℤ_≥cuz 12230 -_𝑒cxne 12491 [,)cico 12727 lim supclsp 14812 lim infclsi 42122 SAlgcsalg 42683 SMblFncsmblfn 43067

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-rep 5176 ax-sep 5189 ax-nul 5196 ax-pow 5252 ax-pr 5316 ax-un 7447 ax-inf2 9090 ax-cc 9843 ax-ac2 9871 ax-cnex 10579 ax-resscn 10580 ax-1cn 10581 ax-icn 10582 ax-addcl 10583 ax-addrcl 10584 ax-mulcl 10585 ax-mulrcl 10586 ax-mulcom 10587 ax-addass 10588 ax-mulass 10589 ax-distr 10590 ax-i2m1 10591 ax-1ne0 10592 ax-1rid 10593 ax-rnegex 10594 ax-rrecex 10595 ax-cnre 10596 ax-pre-lttri 10597 ax-pre-lttrn 10598 ax-pre-ltadd 10599 ax-pre-mulgt0 10600 ax-pre-sup 10601

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3488 df-sbc 3764 df-csb 3872 df-dif 3927 df-un 3929 df-in 3931 df-ss 3940 df-pss 3942 df-nul 4280 df-if 4454 df-pw 4527 df-sn 4554 df-pr 4556 df-tp 4558 df-op 4560 df-uni 4825 df-int 4863 df-iun 4907 df-iin 4908 df-br 5053 df-opab 5115 df-mpt 5133 df-tr 5159 df-id 5446 df-eprel 5451 df-po 5460 df-so 5461 df-fr 5500 df-se 5501 df-we 5502 df-xp 5547 df-rel 5548 df-cnv 5549 df-co 5550 df-dm 5551 df-rn 5552 df-res 5553 df-ima 5554 df-pred 6134 df-ord 6180 df-on 6181 df-lim 6182 df-suc 6183 df-iota 6300 df-fun 6343 df-fn 6344 df-f 6345 df-f1 6346 df-fo 6347 df-f1o 6348 df-fv 6349 df-isom 6350 df-riota 7100 df-ov 7145 df-oprab 7146 df-mpo 7147 df-om 7567 df-1st 7675 df-2nd 7676 df-wrecs 7933 df-recs 7994 df-rdg 8032 df-1o 8088 df-oadd 8092 df-omul 8093 df-er 8275 df-map 8394 df-pm 8395 df-en 8496 df-dom 8497 df-sdom 8498 df-fin 8499 df-sup 8892 df-inf 8893 df-oi 8960 df-card 9354 df-acn 9357 df-ac 9528 df-pnf 10663 df-mnf 10664 df-xr 10665 df-ltxr 10666 df-le 10667 df-sub 10858 df-neg 10859 df-div 11284 df-nn 11625 df-2 11687 df-3 11688 df-4 11689 df-n0 11885 df-z 11969 df-uz 12231 df-q 12336 df-rp 12377 df-xneg 12494 df-ioo 12729 df-ioc 12730 df-ico 12731 df-icc 12732 df-fz 12883 df-fzo 13024 df-fl 13152 df-ceil 13153 df-seq 13360 df-exp 13420 df-hash 13681 df-word 13852 df-concat 13908 df-s1 13935 df-s2 14195 df-s3 14196 df-s4 14197 df-cj 14443 df-re 14444 df-im 14445 df-sqrt 14579 df-abs 14580 df-limsup 14813 df-clim 14830 df-rlim 14831 df-rest 16679 df-topgen 16700 df-top 21485 df-bases 21537 df-liminf 42123 df-salg 42684 df-salgen 42688 df-smblfn 43068

This theorem is referenced by: smfliminf 43195

W3C validator