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Theorem tayl0 25865

Description: The Taylor series is always defined at the basepoint, with value equal to the value of the function. (Contributed by Mario Carneiro, 30-Dec-2016.)

**Hypotheses**
Ref	Expression
taylfval.s	⊢ (𝜑 → 𝑆 ∈ {ℝ, ℂ})
taylfval.f	⊢ (𝜑 → 𝐹:𝐴⟶ℂ)
taylfval.a	⊢ (𝜑 → 𝐴 ⊆ 𝑆)
taylfval.n	⊢ (𝜑 → (𝑁 ∈ ℕ₀ ∨ 𝑁 = +∞))
taylfval.b	⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → 𝐵 ∈ dom ((𝑆 D^𝑛 𝐹)‘𝑘))
taylfval.t	⊢ 𝑇 = (𝑁(𝑆 Tayl 𝐹)𝐵)

**Assertion**
Ref	Expression
tayl0	⊢ (𝜑 → (𝐵 ∈ dom 𝑇 ∧ (𝑇‘𝐵) = (𝐹‘𝐵)))

Distinct variable groups: 𝐵,𝑘 𝑘,𝐹 𝜑,𝑘 𝑘,𝑁 𝑆,𝑘 Allowed substitution hints: 𝐴(𝑘) 𝑇(𝑘)

**Proof of Theorem tayl0**
Step	Hyp	Ref	Expression
1		taylfval.a	. . . . 5 ⊢ (𝜑 → 𝐴 ⊆ 𝑆)
2		taylfval.s	. . . . . 6 ⊢ (𝜑 → 𝑆 ∈ {ℝ, ℂ})
3		recnprss 25412	. . . . . 6 ⊢ (𝑆 ∈ {ℝ, ℂ} → 𝑆 ⊆ ℂ)
4	2, 3	syl 17	. . . . 5 ⊢ (𝜑 → 𝑆 ⊆ ℂ)
5	1, 4	sstrd 3991	. . . 4 ⊢ (𝜑 → 𝐴 ⊆ ℂ)
6		fveq2 6888	. . . . . . . 8 ⊢ (𝑘 = 0 → ((𝑆 D^𝑛 𝐹)‘𝑘) = ((𝑆 D^𝑛 𝐹)‘0))
7	6	dmeqd 5903	. . . . . . 7 ⊢ (𝑘 = 0 → dom ((𝑆 D^𝑛 𝐹)‘𝑘) = dom ((𝑆 D^𝑛 𝐹)‘0))
8	7	eleq2d 2819	. . . . . 6 ⊢ (𝑘 = 0 → (𝐵 ∈ dom ((𝑆 D^𝑛 𝐹)‘𝑘) ↔ 𝐵 ∈ dom ((𝑆 D^𝑛 𝐹)‘0)))
9		taylfval.b	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → 𝐵 ∈ dom ((𝑆 D^𝑛 𝐹)‘𝑘))
10	9	ralrimiva 3146	. . . . . 6 ⊢ (𝜑 → ∀𝑘 ∈ ((0[,]𝑁) ∩ ℤ)𝐵 ∈ dom ((𝑆 D^𝑛 𝐹)‘𝑘))
11		taylfval.n	. . . . . . . 8 ⊢ (𝜑 → (𝑁 ∈ ℕ₀ ∨ 𝑁 = +∞))
12		elxnn0 12542	. . . . . . . . 9 ⊢ (𝑁 ∈ ℕ₀^* ↔ (𝑁 ∈ ℕ₀ ∨ 𝑁 = +∞))
13		0xr 11257	. . . . . . . . . . 11 ⊢ 0 ∈ ℝ^*
14	13	a1i 11	. . . . . . . . . 10 ⊢ (𝑁 ∈ ℕ₀^* → 0 ∈ ℝ^*)
15		xnn0xr 12545	. . . . . . . . . 10 ⊢ (𝑁 ∈ ℕ₀^* → 𝑁 ∈ ℝ^*)
16		xnn0ge0 13109	. . . . . . . . . 10 ⊢ (𝑁 ∈ ℕ₀^* → 0 ≤ 𝑁)
17		lbicc2 13437	. . . . . . . . . 10 ⊢ ((0 ∈ ℝ^* ∧ 𝑁 ∈ ℝ^* ∧ 0 ≤ 𝑁) → 0 ∈ (0[,]𝑁))
18	14, 15, 16, 17	syl3anc 1371	. . . . . . . . 9 ⊢ (𝑁 ∈ ℕ₀^* → 0 ∈ (0[,]𝑁))
19	12, 18	sylbir 234	. . . . . . . 8 ⊢ ((𝑁 ∈ ℕ₀ ∨ 𝑁 = +∞) → 0 ∈ (0[,]𝑁))
20	11, 19	syl 17	. . . . . . 7 ⊢ (𝜑 → 0 ∈ (0[,]𝑁))
21		0zd 12566	. . . . . . 7 ⊢ (𝜑 → 0 ∈ ℤ)
22	20, 21	elind 4193	. . . . . 6 ⊢ (𝜑 → 0 ∈ ((0[,]𝑁) ∩ ℤ))
23	8, 10, 22	rspcdva 3613	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ dom ((𝑆 D^𝑛 𝐹)‘0))
24		cnex 11187	. . . . . . . . . 10 ⊢ ℂ ∈ V
25	24	a1i 11	. . . . . . . . 9 ⊢ (𝜑 → ℂ ∈ V)
26		taylfval.f	. . . . . . . . 9 ⊢ (𝜑 → 𝐹:𝐴⟶ℂ)
27		elpm2r 8835	. . . . . . . . 9 ⊢ (((ℂ ∈ V ∧ 𝑆 ∈ {ℝ, ℂ}) ∧ (𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆)) → 𝐹 ∈ (ℂ ↑_pm 𝑆))
28	25, 2, 26, 1, 27	syl22anc 837	. . . . . . . 8 ⊢ (𝜑 → 𝐹 ∈ (ℂ ↑_pm 𝑆))
29		dvn0 25432	. . . . . . . 8 ⊢ ((𝑆 ⊆ ℂ ∧ 𝐹 ∈ (ℂ ↑_pm 𝑆)) → ((𝑆 D^𝑛 𝐹)‘0) = 𝐹)
30	4, 28, 29	syl2anc 584	. . . . . . 7 ⊢ (𝜑 → ((𝑆 D^𝑛 𝐹)‘0) = 𝐹)
31	30	dmeqd 5903	. . . . . 6 ⊢ (𝜑 → dom ((𝑆 D^𝑛 𝐹)‘0) = dom 𝐹)
32	26	fdmd 6725	. . . . . 6 ⊢ (𝜑 → dom 𝐹 = 𝐴)
33	31, 32	eqtrd 2772	. . . . 5 ⊢ (𝜑 → dom ((𝑆 D^𝑛 𝐹)‘0) = 𝐴)
34	23, 33	eleqtrd 2835	. . . 4 ⊢ (𝜑 → 𝐵 ∈ 𝐴)
35	5, 34	sseldd 3982	. . 3 ⊢ (𝜑 → 𝐵 ∈ ℂ)
36		cnfldbas 20940	. . . . . . 7 ⊢ ℂ = (Base‘ℂ_fld)
37		cnfld0 20961	. . . . . . 7 ⊢ 0 = (0_g‘ℂ_fld)
38		cnring 20959	. . . . . . . 8 ⊢ ℂ_fld ∈ Ring
39		ringmnd 20059	. . . . . . . 8 ⊢ (ℂ_fld ∈ Ring → ℂ_fld ∈ Mnd)
40	38, 39	mp1i 13	. . . . . . 7 ⊢ (𝜑 → ℂ_fld ∈ Mnd)
41		ovex 7438	. . . . . . . . 9 ⊢ (0[,]𝑁) ∈ V
42	41	inex1 5316	. . . . . . . 8 ⊢ ((0[,]𝑁) ∩ ℤ) ∈ V
43	42	a1i 11	. . . . . . 7 ⊢ (𝜑 → ((0[,]𝑁) ∩ ℤ) ∈ V)
44	2	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → 𝑆 ∈ {ℝ, ℂ})
45	28	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → 𝐹 ∈ (ℂ ↑_pm 𝑆))
46		simpr 485	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → 𝑘 ∈ ((0[,]𝑁) ∩ ℤ))
47	46	elin2d 4198	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → 𝑘 ∈ ℤ)
48	46	elin1d 4197	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → 𝑘 ∈ (0[,]𝑁))
49		nn0re 12477	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑁 ∈ ℕ₀ → 𝑁 ∈ ℝ)
50	49	rexrd 11260	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑁 ∈ ℕ₀ → 𝑁 ∈ ℝ^*)
51		id 22	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑁 = +∞ → 𝑁 = +∞)
52		pnfxr 11264	. . . . . . . . . . . . . . . . . . . 20 ⊢ +∞ ∈ ℝ^*
53	51, 52	eqeltrdi 2841	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑁 = +∞ → 𝑁 ∈ ℝ^*)
54	50, 53	jaoi 855	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑁 ∈ ℕ₀ ∨ 𝑁 = +∞) → 𝑁 ∈ ℝ^*)
55	11, 54	syl 17	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → 𝑁 ∈ ℝ^*)
56	55	adantr 481	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → 𝑁 ∈ ℝ^*)
57		elicc1 13364	. . . . . . . . . . . . . . . 16 ⊢ ((0 ∈ ℝ^* ∧ 𝑁 ∈ ℝ^) → (𝑘 ∈ (0[,]𝑁) ↔ (𝑘 ∈ ℝ^ ∧ 0 ≤ 𝑘 ∧ 𝑘 ≤ 𝑁)))
58	13, 56, 57	sylancr 587	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → (𝑘 ∈ (0[,]𝑁) ↔ (𝑘 ∈ ℝ^* ∧ 0 ≤ 𝑘 ∧ 𝑘 ≤ 𝑁)))
59	48, 58	mpbid 231	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → (𝑘 ∈ ℝ^* ∧ 0 ≤ 𝑘 ∧ 𝑘 ≤ 𝑁))
60	59	simp2d 1143	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → 0 ≤ 𝑘)
61		elnn0z 12567	. . . . . . . . . . . . 13 ⊢ (𝑘 ∈ ℕ₀ ↔ (𝑘 ∈ ℤ ∧ 0 ≤ 𝑘))
62	47, 60, 61	sylanbrc 583	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → 𝑘 ∈ ℕ₀)
63		dvnf 25435	. . . . . . . . . . . 12 ⊢ ((𝑆 ∈ {ℝ, ℂ} ∧ 𝐹 ∈ (ℂ ↑_pm 𝑆) ∧ 𝑘 ∈ ℕ₀) → ((𝑆 D^𝑛 𝐹)‘𝑘):dom ((𝑆 D^𝑛 𝐹)‘𝑘)⟶ℂ)
64	44, 45, 62, 63	syl3anc 1371	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → ((𝑆 D^𝑛 𝐹)‘𝑘):dom ((𝑆 D^𝑛 𝐹)‘𝑘)⟶ℂ)
65	64, 9	ffvelcdmd 7084	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → (((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) ∈ ℂ)
66	62	faccld 14240	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → (!‘𝑘) ∈ ℕ)
67	66	nncnd 12224	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → (!‘𝑘) ∈ ℂ)
68	66	nnne0d 12258	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → (!‘𝑘) ≠ 0)
69	65, 67, 68	divcld 11986	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → ((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) ∈ ℂ)
70		0cnd 11203	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → 0 ∈ ℂ)
71	70, 62	expcld 14107	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → (0↑𝑘) ∈ ℂ)
72	69, 71	mulcld 11230	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)) ∈ ℂ)
73	72	fmpttd 7111	. . . . . . 7 ⊢ (𝜑 → (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘))):((0[,]𝑁) ∩ ℤ)⟶ℂ)
74		eldifi 4125	. . . . . . . . . . . . 13 ⊢ (𝑘 ∈ (((0[,]𝑁) ∩ ℤ) ∖ {0}) → 𝑘 ∈ ((0[,]𝑁) ∩ ℤ))
75	74, 62	sylan2 593	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑘 ∈ (((0[,]𝑁) ∩ ℤ) ∖ {0})) → 𝑘 ∈ ℕ₀)
76		eldifsni 4792	. . . . . . . . . . . . 13 ⊢ (𝑘 ∈ (((0[,]𝑁) ∩ ℤ) ∖ {0}) → 𝑘 ≠ 0)
77	76	adantl 482	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑘 ∈ (((0[,]𝑁) ∩ ℤ) ∖ {0})) → 𝑘 ≠ 0)
78		elnnne0 12482	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ ℕ ↔ (𝑘 ∈ ℕ₀ ∧ 𝑘 ≠ 0))
79	75, 77, 78	sylanbrc 583	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ (((0[,]𝑁) ∩ ℤ) ∖ {0})) → 𝑘 ∈ ℕ)
80	79	0expd 14100	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ (((0[,]𝑁) ∩ ℤ) ∖ {0})) → (0↑𝑘) = 0)
81	80	oveq2d 7421	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (((0[,]𝑁) ∩ ℤ) ∖ {0})) → (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)) = (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · 0))
82	69	mul01d 11409	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · 0) = 0)
83	74, 82	sylan2 593	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (((0[,]𝑁) ∩ ℤ) ∖ {0})) → (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · 0) = 0)
84	81, 83	eqtrd 2772	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (((0[,]𝑁) ∩ ℤ) ∖ {0})) → (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)) = 0)
85		zex 12563	. . . . . . . . . 10 ⊢ ℤ ∈ V
86	85	inex2 5317	. . . . . . . . 9 ⊢ ((0[,]𝑁) ∩ ℤ) ∈ V
87	86	a1i 11	. . . . . . . 8 ⊢ (𝜑 → ((0[,]𝑁) ∩ ℤ) ∈ V)
88	84, 87	suppss2 8181	. . . . . . 7 ⊢ (𝜑 → ((𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘))) supp 0) ⊆ {0})
89	36, 37, 40, 43, 22, 73, 88	gsumpt 19824	. . . . . 6 ⊢ (𝜑 → (ℂ_fld Σ_g (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)))) = ((𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)))‘0))
90	6	fveq1d 6890	. . . . . . . . . 10 ⊢ (𝑘 = 0 → (((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) = (((𝑆 D^𝑛 𝐹)‘0)‘𝐵))
91		fveq2 6888	. . . . . . . . . . 11 ⊢ (𝑘 = 0 → (!‘𝑘) = (!‘0))
92		fac0 14232	. . . . . . . . . . 11 ⊢ (!‘0) = 1
93	91, 92	eqtrdi 2788	. . . . . . . . . 10 ⊢ (𝑘 = 0 → (!‘𝑘) = 1)
94	90, 93	oveq12d 7423	. . . . . . . . 9 ⊢ (𝑘 = 0 → ((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) = ((((𝑆 D^𝑛 𝐹)‘0)‘𝐵) / 1))
95		oveq2 7413	. . . . . . . . . 10 ⊢ (𝑘 = 0 → (0↑𝑘) = (0↑0))
96		0exp0e1 14028	. . . . . . . . . 10 ⊢ (0↑0) = 1
97	95, 96	eqtrdi 2788	. . . . . . . . 9 ⊢ (𝑘 = 0 → (0↑𝑘) = 1)
98	94, 97	oveq12d 7423	. . . . . . . 8 ⊢ (𝑘 = 0 → (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)) = (((((𝑆 D^𝑛 𝐹)‘0)‘𝐵) / 1) · 1))
99		eqid 2732	. . . . . . . 8 ⊢ (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘))) = (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)))
100		ovex 7438	. . . . . . . 8 ⊢ (((((𝑆 D^𝑛 𝐹)‘0)‘𝐵) / 1) · 1) ∈ V
101	98, 99, 100	fvmpt 6995	. . . . . . 7 ⊢ (0 ∈ ((0[,]𝑁) ∩ ℤ) → ((𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)))‘0) = (((((𝑆 D^𝑛 𝐹)‘0)‘𝐵) / 1) · 1))
102	22, 101	syl 17	. . . . . 6 ⊢ (𝜑 → ((𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)))‘0) = (((((𝑆 D^𝑛 𝐹)‘0)‘𝐵) / 1) · 1))
103	30	fveq1d 6890	. . . . . . . . . 10 ⊢ (𝜑 → (((𝑆 D^𝑛 𝐹)‘0)‘𝐵) = (𝐹‘𝐵))
104	103	oveq1d 7420	. . . . . . . . 9 ⊢ (𝜑 → ((((𝑆 D^𝑛 𝐹)‘0)‘𝐵) / 1) = ((𝐹‘𝐵) / 1))
105	26, 34	ffvelcdmd 7084	. . . . . . . . . 10 ⊢ (𝜑 → (𝐹‘𝐵) ∈ ℂ)
106	105	div1d 11978	. . . . . . . . 9 ⊢ (𝜑 → ((𝐹‘𝐵) / 1) = (𝐹‘𝐵))
107	104, 106	eqtrd 2772	. . . . . . . 8 ⊢ (𝜑 → ((((𝑆 D^𝑛 𝐹)‘0)‘𝐵) / 1) = (𝐹‘𝐵))
108	107	oveq1d 7420	. . . . . . 7 ⊢ (𝜑 → (((((𝑆 D^𝑛 𝐹)‘0)‘𝐵) / 1) · 1) = ((𝐹‘𝐵) · 1))
109	105	mulridd 11227	. . . . . . 7 ⊢ (𝜑 → ((𝐹‘𝐵) · 1) = (𝐹‘𝐵))
110	108, 109	eqtrd 2772	. . . . . 6 ⊢ (𝜑 → (((((𝑆 D^𝑛 𝐹)‘0)‘𝐵) / 1) · 1) = (𝐹‘𝐵))
111	89, 102, 110	3eqtrd 2776	. . . . 5 ⊢ (𝜑 → (ℂ_fld Σ_g (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)))) = (𝐹‘𝐵))
112		ringcmn 20092	. . . . . . 7 ⊢ (ℂ_fld ∈ Ring → ℂ_fld ∈ CMnd)
113	38, 112	mp1i 13	. . . . . 6 ⊢ (𝜑 → ℂ_fld ∈ CMnd)
114		cnfldtps 24285	. . . . . . 7 ⊢ ℂ_fld ∈ TopSp
115	114	a1i 11	. . . . . 6 ⊢ (𝜑 → ℂ_fld ∈ TopSp)
116		mptexg 7219	. . . . . . . 8 ⊢ (((0[,]𝑁) ∩ ℤ) ∈ V → (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘))) ∈ V)
117	86, 116	mp1i 13	. . . . . . 7 ⊢ (𝜑 → (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘))) ∈ V)
118		funmpt 6583	. . . . . . . 8 ⊢ Fun (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)))
119	118	a1i 11	. . . . . . 7 ⊢ (𝜑 → Fun (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘))))
120		c0ex 11204	. . . . . . . 8 ⊢ 0 ∈ V
121	120	a1i 11	. . . . . . 7 ⊢ (𝜑 → 0 ∈ V)
122		snfi 9040	. . . . . . . 8 ⊢ {0} ∈ Fin
123	122	a1i 11	. . . . . . 7 ⊢ (𝜑 → {0} ∈ Fin)
124		suppssfifsupp 9374	. . . . . . 7 ⊢ ((((𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘))) ∈ V ∧ Fun (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘))) ∧ 0 ∈ V) ∧ ({0} ∈ Fin ∧ ((𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘))) supp 0) ⊆ {0})) → (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘))) finSupp 0)
125	117, 119, 121, 123, 88, 124	syl32anc 1378	. . . . . 6 ⊢ (𝜑 → (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘))) finSupp 0)
126	36, 37, 113, 115, 43, 73, 125	tsmsid 23635	. . . . 5 ⊢ (𝜑 → (ℂ_fld Σ_g (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)))) ∈ (ℂ_fld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)))))
127	111, 126	eqeltrrd 2834	. . . 4 ⊢ (𝜑 → (𝐹‘𝐵) ∈ (ℂ_fld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)))))
128	35	subidd 11555	. . . . . . . 8 ⊢ (𝜑 → (𝐵 − 𝐵) = 0)
129	128	oveq1d 7420	. . . . . . 7 ⊢ (𝜑 → ((𝐵 − 𝐵)↑𝑘) = (0↑𝑘))
130	129	oveq2d 7421	. . . . . 6 ⊢ (𝜑 → (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝐵 − 𝐵)↑𝑘)) = (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)))
131	130	mpteq2dv 5249	. . . . 5 ⊢ (𝜑 → (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝐵 − 𝐵)↑𝑘))) = (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘))))
132	131	oveq2d 7421	. . . 4 ⊢ (𝜑 → (ℂ_fld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝐵 − 𝐵)↑𝑘)))) = (ℂ_fld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · (0↑𝑘)))))
133	127, 132	eleqtrrd 2836	. . 3 ⊢ (𝜑 → (𝐹‘𝐵) ∈ (ℂ_fld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝐵 − 𝐵)↑𝑘)))))
134		taylfval.t	. . . 4 ⊢ 𝑇 = (𝑁(𝑆 Tayl 𝐹)𝐵)
135	2, 26, 1, 11, 9, 134	eltayl 25863	. . 3 ⊢ (𝜑 → (𝐵𝑇(𝐹‘𝐵) ↔ (𝐵 ∈ ℂ ∧ (𝐹‘𝐵) ∈ (ℂ_fld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D^𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝐵 − 𝐵)↑𝑘)))))))
136	35, 133, 135	mpbir2and 711	. 2 ⊢ (𝜑 → 𝐵𝑇(𝐹‘𝐵))
137	2, 26, 1, 11, 9, 134	taylf 25864	. . 3 ⊢ (𝜑 → 𝑇:dom 𝑇⟶ℂ)
138		ffun 6717	. . 3 ⊢ (𝑇:dom 𝑇⟶ℂ → Fun 𝑇)
139		funbrfv2b 6946	. . 3 ⊢ (Fun 𝑇 → (𝐵𝑇(𝐹‘𝐵) ↔ (𝐵 ∈ dom 𝑇 ∧ (𝑇‘𝐵) = (𝐹‘𝐵))))
140	137, 138, 139	3syl 18	. 2 ⊢ (𝜑 → (𝐵𝑇(𝐹‘𝐵) ↔ (𝐵 ∈ dom 𝑇 ∧ (𝑇‘𝐵) = (𝐹‘𝐵))))
141	136, 140	mpbid 231	1 ⊢ (𝜑 → (𝐵 ∈ dom 𝑇 ∧ (𝑇‘𝐵) = (𝐹‘𝐵)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∨ wo 845 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 Vcvv 3474 ∖ cdif 3944 ∩ cin 3946 ⊆ wss 3947 {csn 4627 {cpr 4629 class class class wbr 5147 ↦ cmpt 5230 dom cdm 5675 Fun wfun 6534 ⟶wf 6536 ‘cfv 6540 (class class class)co 7405 supp csupp 8142 ↑_pm cpm 8817 Fincfn 8935 finSupp cfsupp 9357 ℂcc 11104 ℝcr 11105 0cc0 11106 1c1 11107 · cmul 11111 +∞cpnf 11241 ℝ^*cxr 11243 ≤ cle 11245 − cmin 11440 / cdiv 11867 ℕcn 12208 ℕ₀cn0 12468 ℕ₀^*cxnn0 12540 ℤcz 12554 [,]cicc 13323 ↑cexp 14023 !cfa 14229 Σ_g cgsu 17382 Mndcmnd 18621 CMndccmn 19642 Ringcrg 20049 ℂ_fldccnfld 20936 TopSpctps 22425 tsums ctsu 23621 D^𝑛 cdvn 25372 Tayl ctayl 25856

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 ax-mulf 11186

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-tp 4632 df-op 4634 df-uni 4908 df-int 4950 df-iun 4998 df-iin 4999 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-om 7852 df-1st 7971 df-2nd 7972 df-supp 8143 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-er 8699 df-map 8818 df-pm 8819 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-fsupp 9358 df-fi 9402 df-sup 9433 df-inf 9434 df-oi 9501 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-5 12274 df-6 12275 df-7 12276 df-8 12277 df-9 12278 df-n0 12469 df-xnn0 12541 df-z 12555 df-dec 12674 df-uz 12819 df-q 12929 df-rp 12971 df-xneg 13088 df-xadd 13089 df-xmul 13090 df-icc 13327 df-fz 13481 df-fzo 13624 df-seq 13963 df-exp 14024 df-fac 14230 df-hash 14287 df-cj 15042 df-re 15043 df-im 15044 df-sqrt 15178 df-abs 15179 df-struct 17076 df-sets 17093 df-slot 17111 df-ndx 17123 df-base 17141 df-ress 17170 df-plusg 17206 df-mulr 17207 df-starv 17208 df-tset 17212 df-ple 17213 df-ds 17215 df-unif 17216 df-rest 17364 df-topn 17365 df-0g 17383 df-gsum 17384 df-topgen 17385 df-mre 17526 df-mrc 17527 df-acs 17529 df-mgm 18557 df-sgrp 18606 df-mnd 18622 df-submnd 18668 df-grp 18818 df-minusg 18819 df-mulg 18945 df-cntz 19175 df-cmn 19644 df-abl 19645 df-mgp 19982 df-ur 19999 df-ring 20051 df-cring 20052 df-psmet 20928 df-xmet 20929 df-met 20930 df-bl 20931 df-mopn 20932 df-fbas 20933 df-fg 20934 df-cnfld 20937 df-top 22387 df-topon 22404 df-topsp 22426 df-bases 22440 df-cld 22514 df-ntr 22515 df-cls 22516 df-nei 22593 df-lp 22631 df-perf 22632 df-cnp 22723 df-haus 22810 df-fil 23341 df-fm 23433 df-flim 23434 df-flf 23435 df-tsms 23622 df-xms 23817 df-ms 23818 df-limc 25374 df-dv 25375 df-dvn 25376 df-tayl 25858

This theorem is referenced by: dvntaylp0 25875

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