Theorem taylfval 23917

Description: Define the Taylor polynomial of a function. The constant Tayl is a function of five arguments: 𝑆 is the base set with respect to evaluate the derivatives (generally ℝ or ℂ), 𝐹 is the function we are approximating, at point 𝐵, to order 𝑁. The result is a polynomial function of 𝑥.

This "extended" version of taylpfval 23923 additionally handles the case 𝑁 = +∞, in which case this is not a polynomial but an infinite series, the Taylor series 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 D𝑛 𝐹)‘𝑘))
taylfval.t	⊢ 𝑇 = (𝑁(𝑆 Tayl 𝐹)𝐵)

Assertion

Ref	Expression
taylfval	⊢ (𝜑 → 𝑇 = ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))))

Distinct variable groups:   𝑥,𝑘,𝐵   𝑘,𝐹,𝑥   𝜑,𝑘,𝑥   𝑘,𝑁,𝑥   𝑆,𝑘,𝑥   𝑥,𝑇

Allowed substitution hints:   𝐴(𝑥,𝑘)   𝑇(𝑘)

Proof of Theorem taylfval

Dummy variables 𝑎 𝑛 𝑓 𝑠 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		taylfval.t	. 2 ⊢ 𝑇 = (𝑁(𝑆 Tayl 𝐹)𝐵)
2		df-tayl 23913	. . . . 5 ⊢ Tayl = (𝑠 ∈ {ℝ, ℂ}, 𝑓 ∈ (ℂ ↑pm 𝑠) ↦ (𝑛 ∈ (ℕ0 ∪ {+∞}), 𝑎 ∈ ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑠 D𝑛 𝑓)‘𝑘) ↦ ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑠 D𝑛 𝑓)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)))))))
3	2	a1i 11	. . . 4 ⊢ (𝜑 → Tayl = (𝑠 ∈ {ℝ, ℂ}, 𝑓 ∈ (ℂ ↑pm 𝑠) ↦ (𝑛 ∈ (ℕ0 ∪ {+∞}), 𝑎 ∈ ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑠 D𝑛 𝑓)‘𝑘) ↦ ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑠 D𝑛 𝑓)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘))))))))
4		eqidd 2611	. . . . 5 ⊢ ((𝜑 ∧ (𝑠 = 𝑆 ∧ 𝑓 = 𝐹)) → (ℕ0 ∪ {+∞}) = (ℕ0 ∪ {+∞}))
5		oveq12 6558	. . . . . . . . 9 ⊢ ((𝑠 = 𝑆 ∧ 𝑓 = 𝐹) → (𝑠 D𝑛 𝑓) = (𝑆 D𝑛 𝐹))
6	5	ad2antlr 759	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑠 = 𝑆 ∧ 𝑓 = 𝐹)) ∧ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)) → (𝑠 D𝑛 𝑓) = (𝑆 D𝑛 𝐹))
7	6	fveq1d 6105	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑠 = 𝑆 ∧ 𝑓 = 𝐹)) ∧ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)) → ((𝑠 D𝑛 𝑓)‘𝑘) = ((𝑆 D𝑛 𝐹)‘𝑘))
8	7	dmeqd 5248	. . . . . 6 ⊢ (((𝜑 ∧ (𝑠 = 𝑆 ∧ 𝑓 = 𝐹)) ∧ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)) → dom ((𝑠 D𝑛 𝑓)‘𝑘) = dom ((𝑆 D𝑛 𝐹)‘𝑘))
9	8	iineq2dv 4479	. . . . 5 ⊢ ((𝜑 ∧ (𝑠 = 𝑆 ∧ 𝑓 = 𝐹)) → ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑠 D𝑛 𝑓)‘𝑘) = ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘))
10	7	fveq1d 6105	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑠 = 𝑆 ∧ 𝑓 = 𝐹)) ∧ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)) → (((𝑠 D𝑛 𝑓)‘𝑘)‘𝑎) = (((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎))
11	10	oveq1d 6564	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑠 = 𝑆 ∧ 𝑓 = 𝐹)) ∧ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)) → ((((𝑠 D𝑛 𝑓)‘𝑘)‘𝑎) / (!‘𝑘)) = ((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)))
12	11	oveq1d 6564	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑠 = 𝑆 ∧ 𝑓 = 𝐹)) ∧ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)) → (((((𝑠 D𝑛 𝑓)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)) = (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)))
13	12	mpteq2dva 4672	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑠 = 𝑆 ∧ 𝑓 = 𝐹)) → (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑠 D𝑛 𝑓)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘))) = (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘))))
14	13	oveq2d 6565	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑠 = 𝑆 ∧ 𝑓 = 𝐹)) → (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑠 D𝑛 𝑓)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)))) = (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)))))
15	14	xpeq2d 5063	. . . . . 6 ⊢ ((𝜑 ∧ (𝑠 = 𝑆 ∧ 𝑓 = 𝐹)) → ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑠 D𝑛 𝑓)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘))))) = ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘))))))
16	15	iuneq2d 4483	. . . . 5 ⊢ ((𝜑 ∧ (𝑠 = 𝑆 ∧ 𝑓 = 𝐹)) → ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑠 D𝑛 𝑓)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘))))) = ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘))))))
17	4, 9, 16	mpt2eq123dv 6615	. . . 4 ⊢ ((𝜑 ∧ (𝑠 = 𝑆 ∧ 𝑓 = 𝐹)) → (𝑛 ∈ (ℕ0 ∪ {+∞}), 𝑎 ∈ ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑠 D𝑛 𝑓)‘𝑘) ↦ ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑠 D𝑛 𝑓)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)))))) = (𝑛 ∈ (ℕ0 ∪ {+∞}), 𝑎 ∈ ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ↦ ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)))))))
18		simpr 476	. . . . 5 ⊢ ((𝜑 ∧ 𝑠 = 𝑆) → 𝑠 = 𝑆)
19	18	oveq2d 6565	. . . 4 ⊢ ((𝜑 ∧ 𝑠 = 𝑆) → (ℂ ↑pm 𝑠) = (ℂ ↑pm 𝑆))
20		taylfval.s	. . . 4 ⊢ (𝜑 → 𝑆 ∈ {ℝ, ℂ})
21		cnex 9896	. . . . . 6 ⊢ ℂ ∈ V
22	21	a1i 11	. . . . 5 ⊢ (𝜑 → ℂ ∈ V)
23		taylfval.f	. . . . 5 ⊢ (𝜑 → 𝐹:𝐴⟶ℂ)
24		taylfval.a	. . . . 5 ⊢ (𝜑 → 𝐴 ⊆ 𝑆)
25		elpm2r 7761	. . . . 5 ⊢ (((ℂ ∈ V ∧ 𝑆 ∈ {ℝ, ℂ}) ∧ (𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆)) → 𝐹 ∈ (ℂ ↑pm 𝑆))
26	22, 20, 23, 24, 25	syl22anc 1319	. . . 4 ⊢ (𝜑 → 𝐹 ∈ (ℂ ↑pm 𝑆))
27		nn0ex 11175	. . . . . . 7 ⊢ ℕ0 ∈ V
28		snex 4835	. . . . . . 7 ⊢ {+∞} ∈ V
29	27, 28	unex 6854	. . . . . 6 ⊢ (ℕ0 ∪ {+∞}) ∈ V
30		0xr 9965	. . . . . . . . . . 11 ⊢ 0 ∈ ℝ*
31	30	a1i 11	. . . . . . . . . 10 ⊢ (𝑛 ∈ (ℕ0 ∪ {+∞}) → 0 ∈ ℝ*)
32		nn0ssre 11173	. . . . . . . . . . . . 13 ⊢ ℕ0 ⊆ ℝ
33		ressxr 9962	. . . . . . . . . . . . 13 ⊢ ℝ ⊆ ℝ*
34	32, 33	sstri 3577	. . . . . . . . . . . 12 ⊢ ℕ0 ⊆ ℝ*
35		pnfxr 9971	. . . . . . . . . . . . 13 ⊢ +∞ ∈ ℝ*
36		snssi 4280	. . . . . . . . . . . . 13 ⊢ (+∞ ∈ ℝ* → {+∞} ⊆ ℝ*)
37	35, 36	ax-mp 5	. . . . . . . . . . . 12 ⊢ {+∞} ⊆ ℝ*
38	34, 37	unssi 3750	. . . . . . . . . . 11 ⊢ (ℕ0 ∪ {+∞}) ⊆ ℝ*
39	38	sseli 3564	. . . . . . . . . 10 ⊢ (𝑛 ∈ (ℕ0 ∪ {+∞}) → 𝑛 ∈ ℝ*)
40		elun 3715	. . . . . . . . . . 11 ⊢ (𝑛 ∈ (ℕ0 ∪ {+∞}) ↔ (𝑛 ∈ ℕ0 ∨ 𝑛 ∈ {+∞}))
41		nn0ge0 11195	. . . . . . . . . . . 12 ⊢ (𝑛 ∈ ℕ0 → 0 ≤ 𝑛)
42		0lepnf 11842	. . . . . . . . . . . . 13 ⊢ 0 ≤ +∞
43		elsni 4142	. . . . . . . . . . . . 13 ⊢ (𝑛 ∈ {+∞} → 𝑛 = +∞)
44	42, 43	syl5breqr 4621	. . . . . . . . . . . 12 ⊢ (𝑛 ∈ {+∞} → 0 ≤ 𝑛)
45	41, 44	jaoi 393	. . . . . . . . . . 11 ⊢ ((𝑛 ∈ ℕ0 ∨ 𝑛 ∈ {+∞}) → 0 ≤ 𝑛)
46	40, 45	sylbi 206	. . . . . . . . . 10 ⊢ (𝑛 ∈ (ℕ0 ∪ {+∞}) → 0 ≤ 𝑛)
47		lbicc2 12159	. . . . . . . . . 10 ⊢ ((0 ∈ ℝ* ∧ 𝑛 ∈ ℝ* ∧ 0 ≤ 𝑛) → 0 ∈ (0[,]𝑛))
48	31, 39, 46, 47	syl3anc 1318	. . . . . . . . 9 ⊢ (𝑛 ∈ (ℕ0 ∪ {+∞}) → 0 ∈ (0[,]𝑛))
49		0z 11265	. . . . . . . . 9 ⊢ 0 ∈ ℤ
50		inelcm 3984	. . . . . . . . 9 ⊢ ((0 ∈ (0[,]𝑛) ∧ 0 ∈ ℤ) → ((0[,]𝑛) ∩ ℤ) ≠ ∅)
51	48, 49, 50	sylancl 693	. . . . . . . 8 ⊢ (𝑛 ∈ (ℕ0 ∪ {+∞}) → ((0[,]𝑛) ∩ ℤ) ≠ ∅)
52		fvex 6113	. . . . . . . . . 10 ⊢ ((𝑆 D𝑛 𝐹)‘𝑘) ∈ V
53	52	dmex 6991	. . . . . . . . 9 ⊢ dom ((𝑆 D𝑛 𝐹)‘𝑘) ∈ V
54	53	rgenw 2908	. . . . . . . 8 ⊢ ∀𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ∈ V
55		iinexg 4751	. . . . . . . 8 ⊢ ((((0[,]𝑛) ∩ ℤ) ≠ ∅ ∧ ∀𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ∈ V) → ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ∈ V)
56	51, 54, 55	sylancl 693	. . . . . . 7 ⊢ (𝑛 ∈ (ℕ0 ∪ {+∞}) → ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ∈ V)
57	56	rgen 2906	. . . . . 6 ⊢ ∀𝑛 ∈ (ℕ0 ∪ {+∞})∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ∈ V
58		eqid 2610	. . . . . . 7 ⊢ (𝑛 ∈ (ℕ0 ∪ {+∞}), 𝑎 ∈ ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ↦ ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)))))) = (𝑛 ∈ (ℕ0 ∪ {+∞}), 𝑎 ∈ ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ↦ ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘))))))
59	58	mpt2exxg 7133	. . . . . 6 ⊢ (((ℕ0 ∪ {+∞}) ∈ V ∧ ∀𝑛 ∈ (ℕ0 ∪ {+∞})∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ∈ V) → (𝑛 ∈ (ℕ0 ∪ {+∞}), 𝑎 ∈ ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ↦ ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)))))) ∈ V)
60	29, 57, 59	mp2an 704	. . . . 5 ⊢ (𝑛 ∈ (ℕ0 ∪ {+∞}), 𝑎 ∈ ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ↦ ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)))))) ∈ V
61	60	a1i 11	. . . 4 ⊢ (𝜑 → (𝑛 ∈ (ℕ0 ∪ {+∞}), 𝑎 ∈ ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ↦ ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)))))) ∈ V)
62	3, 17, 19, 20, 26, 61	ovmpt2dx 6685	. . 3 ⊢ (𝜑 → (𝑆 Tayl 𝐹) = (𝑛 ∈ (ℕ0 ∪ {+∞}), 𝑎 ∈ ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ↦ ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)))))))
63		simprl 790	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑛 = 𝑁 ∧ 𝑎 = 𝐵)) → 𝑛 = 𝑁)
64	63	oveq2d 6565	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑛 = 𝑁 ∧ 𝑎 = 𝐵)) → (0[,]𝑛) = (0[,]𝑁))
65	64	ineq1d 3775	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑛 = 𝑁 ∧ 𝑎 = 𝐵)) → ((0[,]𝑛) ∩ ℤ) = ((0[,]𝑁) ∩ ℤ))
66		simprr 792	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑛 = 𝑁 ∧ 𝑎 = 𝐵)) → 𝑎 = 𝐵)
67	66	fveq2d 6107	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑛 = 𝑁 ∧ 𝑎 = 𝐵)) → (((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) = (((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵))
68	67	oveq1d 6564	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑛 = 𝑁 ∧ 𝑎 = 𝐵)) → ((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) = ((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)))
69	66	oveq2d 6565	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑛 = 𝑁 ∧ 𝑎 = 𝐵)) → (𝑥 − 𝑎) = (𝑥 − 𝐵))
70	69	oveq1d 6564	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑛 = 𝑁 ∧ 𝑎 = 𝐵)) → ((𝑥 − 𝑎)↑𝑘) = ((𝑥 − 𝐵)↑𝑘))
71	68, 70	oveq12d 6567	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑛 = 𝑁 ∧ 𝑎 = 𝐵)) → (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)) = (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘)))
72	65, 71	mpteq12dv 4663	. . . . . 6 ⊢ ((𝜑 ∧ (𝑛 = 𝑁 ∧ 𝑎 = 𝐵)) → (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘))) = (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))
73	72	oveq2d 6565	. . . . 5 ⊢ ((𝜑 ∧ (𝑛 = 𝑁 ∧ 𝑎 = 𝐵)) → (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘)))) = (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘)))))
74	73	xpeq2d 5063	. . . 4 ⊢ ((𝜑 ∧ (𝑛 = 𝑁 ∧ 𝑎 = 𝐵)) → ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘))))) = ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))))
75	74	iuneq2d 4483	. . 3 ⊢ ((𝜑 ∧ (𝑛 = 𝑁 ∧ 𝑎 = 𝐵)) → ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑛) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝑎) / (!‘𝑘)) · ((𝑥 − 𝑎)↑𝑘))))) = ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))))
76		simpr 476	. . . . . 6 ⊢ ((𝜑 ∧ 𝑛 = 𝑁) → 𝑛 = 𝑁)
77	76	oveq2d 6565	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 = 𝑁) → (0[,]𝑛) = (0[,]𝑁))
78	77	ineq1d 3775	. . . 4 ⊢ ((𝜑 ∧ 𝑛 = 𝑁) → ((0[,]𝑛) ∩ ℤ) = ((0[,]𝑁) ∩ ℤ))
79		iineq1 4471	. . . 4 ⊢ (((0[,]𝑛) ∩ ℤ) = ((0[,]𝑁) ∩ ℤ) → ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) = ∩ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘))
80	78, 79	syl 17	. . 3 ⊢ ((𝜑 ∧ 𝑛 = 𝑁) → ∩ 𝑘 ∈ ((0[,]𝑛) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) = ∩ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘))
81		taylfval.n	. . . . 5 ⊢ (𝜑 → (𝑁 ∈ ℕ0 ∨ 𝑁 = +∞))
82		pnfex 9972	. . . . . . 7 ⊢ +∞ ∈ V
83	82	elsn2 4158	. . . . . 6 ⊢ (𝑁 ∈ {+∞} ↔ 𝑁 = +∞)
84	83	orbi2i 540	. . . . 5 ⊢ ((𝑁 ∈ ℕ0 ∨ 𝑁 ∈ {+∞}) ↔ (𝑁 ∈ ℕ0 ∨ 𝑁 = +∞))
85	81, 84	sylibr 223	. . . 4 ⊢ (𝜑 → (𝑁 ∈ ℕ0 ∨ 𝑁 ∈ {+∞}))
86		elun 3715	. . . 4 ⊢ (𝑁 ∈ (ℕ0 ∪ {+∞}) ↔ (𝑁 ∈ ℕ0 ∨ 𝑁 ∈ {+∞}))
87	85, 86	sylibr 223	. . 3 ⊢ (𝜑 → 𝑁 ∈ (ℕ0 ∪ {+∞}))
88		taylfval.b	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)) → 𝐵 ∈ dom ((𝑆 D𝑛 𝐹)‘𝑘))
89	88	ralrimiva 2949	. . . 4 ⊢ (𝜑 → ∀𝑘 ∈ ((0[,]𝑁) ∩ ℤ)𝐵 ∈ dom ((𝑆 D𝑛 𝐹)‘𝑘))
90		oveq2 6557	. . . . . . . . . 10 ⊢ (𝑛 = 𝑁 → (0[,]𝑛) = (0[,]𝑁))
91	90	ineq1d 3775	. . . . . . . . 9 ⊢ (𝑛 = 𝑁 → ((0[,]𝑛) ∩ ℤ) = ((0[,]𝑁) ∩ ℤ))
92	91	neeq1d 2841	. . . . . . . 8 ⊢ (𝑛 = 𝑁 → (((0[,]𝑛) ∩ ℤ) ≠ ∅ ↔ ((0[,]𝑁) ∩ ℤ) ≠ ∅))
93	92, 51	vtoclga 3245	. . . . . . 7 ⊢ (𝑁 ∈ (ℕ0 ∪ {+∞}) → ((0[,]𝑁) ∩ ℤ) ≠ ∅)
94	87, 93	syl 17	. . . . . 6 ⊢ (𝜑 → ((0[,]𝑁) ∩ ℤ) ≠ ∅)
95		r19.2z 4012	. . . . . 6 ⊢ ((((0[,]𝑁) ∩ ℤ) ≠ ∅ ∧ ∀𝑘 ∈ ((0[,]𝑁) ∩ ℤ)𝐵 ∈ dom ((𝑆 D𝑛 𝐹)‘𝑘)) → ∃𝑘 ∈ ((0[,]𝑁) ∩ ℤ)𝐵 ∈ dom ((𝑆 D𝑛 𝐹)‘𝑘))
96	94, 89, 95	syl2anc 691	. . . . 5 ⊢ (𝜑 → ∃𝑘 ∈ ((0[,]𝑁) ∩ ℤ)𝐵 ∈ dom ((𝑆 D𝑛 𝐹)‘𝑘))
97		elex 3185	. . . . . 6 ⊢ (𝐵 ∈ dom ((𝑆 D𝑛 𝐹)‘𝑘) → 𝐵 ∈ V)
98	97	rexlimivw 3011	. . . . 5 ⊢ (∃𝑘 ∈ ((0[,]𝑁) ∩ ℤ)𝐵 ∈ dom ((𝑆 D𝑛 𝐹)‘𝑘) → 𝐵 ∈ V)
99		eliin 4461	. . . . 5 ⊢ (𝐵 ∈ V → (𝐵 ∈ ∩ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ↔ ∀𝑘 ∈ ((0[,]𝑁) ∩ ℤ)𝐵 ∈ dom ((𝑆 D𝑛 𝐹)‘𝑘)))
100	96, 98, 99	3syl 18	. . . 4 ⊢ (𝜑 → (𝐵 ∈ ∩ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘) ↔ ∀𝑘 ∈ ((0[,]𝑁) ∩ ℤ)𝐵 ∈ dom ((𝑆 D𝑛 𝐹)‘𝑘)))
101	89, 100	mpbird 246	. . 3 ⊢ (𝜑 → 𝐵 ∈ ∩ 𝑘 ∈ ((0[,]𝑁) ∩ ℤ)dom ((𝑆 D𝑛 𝐹)‘𝑘))
102		snssi 4280	. . . . . . . 8 ⊢ (𝑥 ∈ ℂ → {𝑥} ⊆ ℂ)
103	102	adantl 481	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ ℂ) → {𝑥} ⊆ ℂ)
104	20, 23, 24, 81, 88	taylfvallem 23916	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ ℂ) → (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘)))) ⊆ ℂ)
105		xpss12 5148	. . . . . . 7 ⊢ (({𝑥} ⊆ ℂ ∧ (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘)))) ⊆ ℂ) → ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))) ⊆ (ℂ × ℂ))
106	103, 104, 105	syl2anc 691	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ ℂ) → ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))) ⊆ (ℂ × ℂ))
107	106	ralrimiva 2949	. . . . 5 ⊢ (𝜑 → ∀𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))) ⊆ (ℂ × ℂ))
108		iunss 4497	. . . . 5 ⊢ (∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))) ⊆ (ℂ × ℂ) ↔ ∀𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))) ⊆ (ℂ × ℂ))
109	107, 108	sylibr 223	. . . 4 ⊢ (𝜑 → ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))) ⊆ (ℂ × ℂ))
110	21, 21	xpex 6860	. . . . 5 ⊢ (ℂ × ℂ) ∈ V
111	110	ssex 4730	. . . 4 ⊢ (∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))) ⊆ (ℂ × ℂ) → ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))) ∈ V)
112	109, 111	syl 17	. . 3 ⊢ (𝜑 → ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))) ∈ V)
113	62, 75, 80, 87, 101, 112	ovmpt2dx 6685	. 2 ⊢ (𝜑 → (𝑁(𝑆 Tayl 𝐹)𝐵) = ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))))
114	1, 113	syl5eq 2656	1 ⊢ (𝜑 → 𝑇 = ∪ 𝑥 ∈ ℂ ({𝑥} × (ℂfld tsums (𝑘 ∈ ((0[,]𝑁) ∩ ℤ) ↦ (((((𝑆 D𝑛 𝐹)‘𝑘)‘𝐵) / (!‘𝑘)) · ((𝑥 − 𝐵)↑𝑘))))))

Syntax hints:   → wi 4   ↔ wb 195   ∨ wo 382   ∧ wa 383   = wceq 1475   ∈ wcel 1977   ≠ wne 2780  ∀wral 2896  ∃wrex 2897  Vcvv 3173   ∪ cun 3538   ∩ cin 3539   ⊆ wss 3540  ∅c0 3874  {csn 4125  {cpr 4127  ∪ ciun 4455  ∩ ciin 4456   class class class wbr 4583   ↦ cmpt 4643   × cxp 5036  dom cdm 5038  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549   ↦ cmpt2 6551   ↑_pm cpm 7745  ℂcc 9813  ℝcr 9814  0cc0 9815   · cmul 9820  +∞cpnf 9950  ℝ^*cxr 9952   ≤ cle 9954   − cmin 10145   / cdiv 10563  ℕ₀cn0 11169  ℤcz 11254  [,]cicc 12049  ↑cexp 12722  !cfa 12922  ℂ_fldccnfld 19567   tsums ctsu 21739   D^𝑛 cdvn 23434   Tayl ctayl 23911

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-inf2 8421  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892  ax-pre-sup 9893  ax-addf 9894  ax-mulf 9895

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-iin 4458  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-se 4998  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-isom 5813  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-supp 7183  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-oadd 7451  df-er 7629  df-map 7746  df-pm 7747  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-fsupp 8159  df-fi 8200  df-sup 8231  df-inf 8232  df-oi 8298  df-card 8648  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-div 10564  df-nn 10898  df-2 10956  df-3 10957  df-4 10958  df-5 10959  df-6 10960  df-7 10961  df-8 10962  df-9 10963  df-n0 11170  df-z 11255  df-dec 11370  df-uz 11564  df-q 11665  df-rp 11709  df-xneg 11822  df-xadd 11823  df-xmul 11824  df-icc 12053  df-fz 12198  df-fzo 12335  df-seq 12664  df-exp 12723  df-fac 12923  df-hash 12980  df-cj 13687  df-re 13688  df-im 13689  df-sqrt 13823  df-abs 13824  df-struct 15697  df-ndx 15698  df-slot 15699  df-base 15700  df-sets 15701  df-plusg 15781  df-mulr 15782  df-starv 15783  df-tset 15787  df-ple 15788  df-ds 15791  df-unif 15792  df-rest 15906  df-topn 15907  df-0g 15925  df-gsum 15926  df-topgen 15927  df-mgm 17065  df-sgrp 17107  df-mnd 17118  df-grp 17248  df-minusg 17249  df-cntz 17573  df-cmn 18018  df-abl 18019  df-mgp 18313  df-ur 18325  df-ring 18372  df-cring 18373  df-psmet 19559  df-xmet 19560  df-met 19561  df-bl 19562  df-mopn 19563  df-fbas 19564  df-fg 19565  df-cnfld 19568  df-top 20521  df-bases 20522  df-topon 20523  df-topsp 20524  df-cld 20633  df-ntr 20634  df-cls 20635  df-nei 20712  df-lp 20750  df-perf 20751  df-cnp 20842  df-haus 20929  df-fil 21460  df-fm 21552  df-flim 21553  df-flf 21554  df-tsms 21740  df-xms 21935  df-ms 21936  df-limc 23436  df-dv 23437  df-dvn 23438  df-tayl 23913

This theorem is referenced by:  eltayl  23918  taylf  23919  taylpfval  23923