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Theorem dveflem 25152

Description: Derivative of the exponential function at 0. The key step in the proof is eftlub 15827, to show that abs(exp(𝑥) − 1 − 𝑥) ≤ abs(𝑥)↑2 · (3 / 4). (Contributed by Mario Carneiro, 9-Aug-2014.) (Revised by Mario Carneiro, 28-Dec-2016.)

**Assertion**
Ref	Expression
dveflem	⊢ 0(ℂ D exp)1

Proof of Theorem dveflem Dummy variables 𝑘 𝑛 𝑤 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		0cn 10976	. . 3 ⊢ 0 ∈ ℂ
2		eqid 2739	. . . . 5 ⊢ (TopOpen‘ℂ_fld) = (TopOpen‘ℂ_fld)
3	2	cnfldtop 23956	. . . 4 ⊢ (TopOpen‘ℂ_fld) ∈ Top
4		unicntop 23958	. . . . 5 ⊢ ℂ = ∪ (TopOpen‘ℂ_fld)
5	4	ntrtop 22230	. . . 4 ⊢ ((TopOpen‘ℂ_fld) ∈ Top → ((int‘(TopOpen‘ℂ_fld))‘ℂ) = ℂ)
6	3, 5	ax-mp 5	. . 3 ⊢ ((int‘(TopOpen‘ℂ_fld))‘ℂ) = ℂ
7	1, 6	eleqtrri 2839	. 2 ⊢ 0 ∈ ((int‘(TopOpen‘ℂ_fld))‘ℂ)
8		ax-1cn 10938	. . 3 ⊢ 1 ∈ ℂ
9		1rp 12743	. . . . . 6 ⊢ 1 ∈ ℝ⁺
10		ifcl 4505	. . . . . 6 ⊢ ((𝑥 ∈ ℝ⁺ ∧ 1 ∈ ℝ⁺) → if(𝑥 ≤ 1, 𝑥, 1) ∈ ℝ⁺)
11	9, 10	mpan2 688	. . . . 5 ⊢ (𝑥 ∈ ℝ⁺ → if(𝑥 ≤ 1, 𝑥, 1) ∈ ℝ⁺)
12		eldifsn 4721	. . . . . . 7 ⊢ (𝑤 ∈ (ℂ ∖ {0}) ↔ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0))
13		simprl 768	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → 𝑤 ∈ ℂ)
14	13	subid1d 11330	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → (𝑤 − 0) = 𝑤)
15	14	fveq2d 6787	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → (abs‘(𝑤 − 0)) = (abs‘𝑤))
16	15	breq1d 5085	. . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → ((abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1) ↔ (abs‘𝑤) < if(𝑥 ≤ 1, 𝑥, 1)))
17	13	abscld 15157	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → (abs‘𝑤) ∈ ℝ)
18		rpre 12747	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ ℝ⁺ → 𝑥 ∈ ℝ)
19	18	adantr 481	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → 𝑥 ∈ ℝ)
20		1red 10985	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → 1 ∈ ℝ)
21		ltmin 12937	. . . . . . . . . . 11 ⊢ (((abs‘𝑤) ∈ ℝ ∧ 𝑥 ∈ ℝ ∧ 1 ∈ ℝ) → ((abs‘𝑤) < if(𝑥 ≤ 1, 𝑥, 1) ↔ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)))
22	17, 19, 20, 21	syl3anc 1370	. . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → ((abs‘𝑤) < if(𝑥 ≤ 1, 𝑥, 1) ↔ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)))
23	16, 22	bitrd 278	. . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → ((abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1) ↔ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)))
24		simplr 766	. . . . . . . . . . . . . 14 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0))
25	24, 12	sylibr 233	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑤 ∈ (ℂ ∖ {0}))
26		fveq2 6783	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 = 𝑤 → (exp‘𝑧) = (exp‘𝑤))
27	26	oveq1d 7299	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = 𝑤 → ((exp‘𝑧) − 1) = ((exp‘𝑤) − 1))
28		id 22	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = 𝑤 → 𝑧 = 𝑤)
29	27, 28	oveq12d 7302	. . . . . . . . . . . . . 14 ⊢ (𝑧 = 𝑤 → (((exp‘𝑧) − 1) / 𝑧) = (((exp‘𝑤) − 1) / 𝑤))
30		eqid 2739	. . . . . . . . . . . . . 14 ⊢ (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) = (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))
31		ovex 7317	. . . . . . . . . . . . . 14 ⊢ (((exp‘𝑤) − 1) / 𝑤) ∈ V
32	29, 30, 31	fvmpt 6884	. . . . . . . . . . . . 13 ⊢ (𝑤 ∈ (ℂ ∖ {0}) → ((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) = (((exp‘𝑤) − 1) / 𝑤))
33	25, 32	syl 17	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → ((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) = (((exp‘𝑤) − 1) / 𝑤))
34	33	fvoveq1d 7306	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) = (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)))
35		simplrl 774	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑤 ∈ ℂ)
36		efcl 15801	. . . . . . . . . . . . . . . . 17 ⊢ (𝑤 ∈ ℂ → (exp‘𝑤) ∈ ℂ)
37	35, 36	syl 17	. . . . . . . . . . . . . . . 16 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (exp‘𝑤) ∈ ℂ)
38		1cnd 10979	. . . . . . . . . . . . . . . 16 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 1 ∈ ℂ)
39	37, 38	subcld 11341	. . . . . . . . . . . . . . 15 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → ((exp‘𝑤) − 1) ∈ ℂ)
40		simplrr 775	. . . . . . . . . . . . . . 15 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑤 ≠ 0)
41	39, 35, 40	divcld 11760	. . . . . . . . . . . . . 14 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (((exp‘𝑤) − 1) / 𝑤) ∈ ℂ)
42	41, 38	subcld 11341	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → ((((exp‘𝑤) − 1) / 𝑤) − 1) ∈ ℂ)
43	42	abscld 15157	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ∈ ℝ)
44	35	abscld 15157	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘𝑤) ∈ ℝ)
45		simpll 764	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑥 ∈ ℝ⁺)
46	45	rpred 12781	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑥 ∈ ℝ)
47		abscl 14999	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑤 ∈ ℂ → (abs‘𝑤) ∈ ℝ)
48	47	ad2antrr 723	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ∈ ℝ)
49	36	ad2antrr 723	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) ∈ ℂ)
50		subcl 11229	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((exp‘𝑤) ∈ ℂ ∧ 1 ∈ ℂ) → ((exp‘𝑤) − 1) ∈ ℂ)
51	49, 8, 50	sylancl 586	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((exp‘𝑤) − 1) ∈ ℂ)
52		simpll 764	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 𝑤 ∈ ℂ)
53		simplr 766	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 𝑤 ≠ 0)
54	51, 52, 53	divcld 11760	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) / 𝑤) ∈ ℂ)
55		1cnd 10979	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 1 ∈ ℂ)
56	54, 55	subcld 11341	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) / 𝑤) − 1) ∈ ℂ)
57	56	abscld 15157	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ∈ ℝ)
58	48, 57	remulcld 11014	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ∈ ℝ)
59	48	resqcld 13974	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤)↑2) ∈ ℝ)
60		3re 12062	. . . . . . . . . . . . . . . . . 18 ⊢ 3 ∈ ℝ
61		4nn 12065	. . . . . . . . . . . . . . . . . 18 ⊢ 4 ∈ ℕ
62		nndivre 12023	. . . . . . . . . . . . . . . . . 18 ⊢ ((3 ∈ ℝ ∧ 4 ∈ ℕ) → (3 / 4) ∈ ℝ)
63	60, 61, 62	mp2an 689	. . . . . . . . . . . . . . . . 17 ⊢ (3 / 4) ∈ ℝ
64		remulcl 10965	. . . . . . . . . . . . . . . . 17 ⊢ ((((abs‘𝑤)↑2) ∈ ℝ ∧ (3 / 4) ∈ ℝ) → (((abs‘𝑤)↑2) · (3 / 4)) ∈ ℝ)
65	59, 63, 64	sylancl 586	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · (3 / 4)) ∈ ℝ)
66	51, 52	subcld 11341	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) − 𝑤) ∈ ℂ)
67	66, 52, 53	divcan2d 11762	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 · ((((exp‘𝑤) − 1) − 𝑤) / 𝑤)) = (((exp‘𝑤) − 1) − 𝑤))
68	51, 52, 52, 53	divsubdird 11799	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) − 𝑤) / 𝑤) = ((((exp‘𝑤) − 1) / 𝑤) − (𝑤 / 𝑤)))
69	52, 53	dividd 11758	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 / 𝑤) = 1)
70	69	oveq2d 7300	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) / 𝑤) − (𝑤 / 𝑤)) = ((((exp‘𝑤) − 1) / 𝑤) − 1))
71	68, 70	eqtrd 2779	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) − 𝑤) / 𝑤) = ((((exp‘𝑤) − 1) / 𝑤) − 1))
72	71	oveq2d 7300	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 · ((((exp‘𝑤) − 1) − 𝑤) / 𝑤)) = (𝑤 · ((((exp‘𝑤) − 1) / 𝑤) − 1)))
73	49, 55, 52	subsub4d 11372	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) − 𝑤) = ((exp‘𝑤) − (1 + 𝑤)))
74		addcl 10962	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((1 ∈ ℂ ∧ 𝑤 ∈ ℂ) → (1 + 𝑤) ∈ ℂ)
75	8, 52, 74	sylancr 587	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (1 + 𝑤) ∈ ℂ)
76		2nn0 12259	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ 2 ∈ ℕ₀
77		eqid 2739	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛))) = (𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))
78	77	eftlcl 15825	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝑤 ∈ ℂ ∧ 2 ∈ ℕ₀) → Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) ∈ ℂ)
79	52, 76, 78	sylancl 586	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) ∈ ℂ)
80		df-2 12045	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ 2 = (1 + 1)
81		1nn0 12258	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ 1 ∈ ℕ₀
82		1e0p1 12488	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ 1 = (0 + 1)
83		0nn0 12257	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ 0 ∈ ℕ₀
84		0cnd 10977	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 0 ∈ ℂ)
85	77	efval2 15802	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (𝑤 ∈ ℂ → (exp‘𝑤) = Σ𝑘 ∈ ℕ₀ ((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
86	85	ad2antrr 723	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = Σ𝑘 ∈ ℕ₀ ((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
87		nn0uz 12629	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ ℕ₀ = (ℤ_≥‘0)
88	87	sumeq1i 15419	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ Σ𝑘 ∈ ℕ₀ ((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) = Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)
89	86, 88	eqtr2di 2796	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) = (exp‘𝑤))
90	89	oveq2d 7300	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (0 + Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)) = (0 + (exp‘𝑤)))
91	49	addid2d 11185	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (0 + (exp‘𝑤)) = (exp‘𝑤))
92	90, 91	eqtr2d 2780	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = (0 + Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)))
93		eft0val 15830	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (𝑤 ∈ ℂ → ((𝑤↑0) / (!‘0)) = 1)
94	93	ad2antrr 723	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑0) / (!‘0)) = 1)
95	94	oveq2d 7300	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (0 + ((𝑤↑0) / (!‘0))) = (0 + 1))
96	95, 82	eqtr4di 2797	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (0 + ((𝑤↑0) / (!‘0))) = 1)
97	77, 82, 83, 52, 84, 92, 96	efsep 15828	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = (1 + Σ𝑘 ∈ (ℤ_≥‘1)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)))
98		exp1 13797	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (𝑤 ∈ ℂ → (𝑤↑1) = 𝑤)
99	98	ad2antrr 723	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤↑1) = 𝑤)
100	99	oveq1d 7299	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑1) / (!‘1)) = (𝑤 / (!‘1)))
101		fac1 14000	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (!‘1) = 1
102	101	oveq2i 7295	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (𝑤 / (!‘1)) = (𝑤 / 1)
103	100, 102	eqtrdi 2795	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑1) / (!‘1)) = (𝑤 / 1))
104		div1 11673	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (𝑤 ∈ ℂ → (𝑤 / 1) = 𝑤)
105	104	ad2antrr 723	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 / 1) = 𝑤)
106	103, 105	eqtrd 2779	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑1) / (!‘1)) = 𝑤)
107	106	oveq2d 7300	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (1 + ((𝑤↑1) / (!‘1))) = (1 + 𝑤))
108	77, 80, 81, 52, 55, 97, 107	efsep 15828	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = ((1 + 𝑤) + Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)))
109	75, 79, 108	mvrladdd 11397	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((exp‘𝑤) − (1 + 𝑤)) = Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
110	73, 109	eqtrd 2779	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) − 𝑤) = Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
111	67, 72, 110	3eqtr3d 2787	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 · ((((exp‘𝑤) − 1) / 𝑤) − 1)) = Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
112	111	fveq2d 6787	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘(𝑤 · ((((exp‘𝑤) − 1) / 𝑤) − 1))) = (abs‘Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)))
113	52, 56	absmuld 15175	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘(𝑤 · ((((exp‘𝑤) − 1) / 𝑤) − 1))) = ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))))
114	112, 113	eqtr3d 2781	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)) = ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))))
115		eqid 2739	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑛 ∈ ℕ₀ ↦ (((abs‘𝑤)↑𝑛) / (!‘𝑛))) = (𝑛 ∈ ℕ₀ ↦ (((abs‘𝑤)↑𝑛) / (!‘𝑛)))
116		eqid 2739	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑛 ∈ ℕ₀ ↦ ((((abs‘𝑤)↑2) / (!‘2)) · ((1 / (2 + 1))↑𝑛))) = (𝑛 ∈ ℕ₀ ↦ ((((abs‘𝑤)↑2) / (!‘2)) · ((1 / (2 + 1))↑𝑛)))
117		2nn 12055	. . . . . . . . . . . . . . . . . . . 20 ⊢ 2 ∈ ℕ
118	117	a1i 11	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 2 ∈ ℕ)
119		1red 10985	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 1 ∈ ℝ)
120		simpr 485	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) < 1)
121	48, 119, 120	ltled 11132	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ≤ 1)
122	77, 115, 116, 118, 52, 121	eftlub 15827	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)) ≤ (((abs‘𝑤)↑2) · ((2 + 1) / ((!‘2) · 2))))
123	114, 122	eqbrtrrd 5099	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ (((abs‘𝑤)↑2) · ((2 + 1) / ((!‘2) · 2))))
124		df-3 12046	. . . . . . . . . . . . . . . . . . 19 ⊢ 3 = (2 + 1)
125		fac2 14002	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (!‘2) = 2
126	125	oveq1i 7294	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((!‘2) · 2) = (2 · 2)
127		2t2e4 12146	. . . . . . . . . . . . . . . . . . . 20 ⊢ (2 · 2) = 4
128	126, 127	eqtr2i 2768	. . . . . . . . . . . . . . . . . . 19 ⊢ 4 = ((!‘2) · 2)
129	124, 128	oveq12i 7296	. . . . . . . . . . . . . . . . . 18 ⊢ (3 / 4) = ((2 + 1) / ((!‘2) · 2))
130	129	oveq2i 7295	. . . . . . . . . . . . . . . . 17 ⊢ (((abs‘𝑤)↑2) · (3 / 4)) = (((abs‘𝑤)↑2) · ((2 + 1) / ((!‘2) · 2)))
131	123, 130	breqtrrdi 5117	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ (((abs‘𝑤)↑2) · (3 / 4)))
132	63	a1i 11	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (3 / 4) ∈ ℝ)
133	48	sqge0d 13975	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 0 ≤ ((abs‘𝑤)↑2))
134		1re 10984	. . . . . . . . . . . . . . . . . . . 20 ⊢ 1 ∈ ℝ
135		3lt4 12156	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ 3 < 4
136		4cn 12067	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ 4 ∈ ℂ
137	136	mulid1i 10988	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (4 · 1) = 4
138	135, 137	breqtrri 5102	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 3 < (4 · 1)
139		4re 12066	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ 4 ∈ ℝ
140		4pos 12089	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ 0 < 4
141	139, 140	pm3.2i 471	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (4 ∈ ℝ ∧ 0 < 4)
142		ltdivmul 11859	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((3 ∈ ℝ ∧ 1 ∈ ℝ ∧ (4 ∈ ℝ ∧ 0 < 4)) → ((3 / 4) < 1 ↔ 3 < (4 · 1)))
143	60, 134, 141, 142	mp3an 1460	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((3 / 4) < 1 ↔ 3 < (4 · 1))
144	138, 143	mpbir 230	. . . . . . . . . . . . . . . . . . . 20 ⊢ (3 / 4) < 1
145	63, 134, 144	ltleii 11107	. . . . . . . . . . . . . . . . . . 19 ⊢ (3 / 4) ≤ 1
146	145	a1i 11	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (3 / 4) ≤ 1)
147	132, 119, 59, 133, 146	lemul2ad 11924	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · (3 / 4)) ≤ (((abs‘𝑤)↑2) · 1))
148	48	recnd 11012	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ∈ ℂ)
149	148	sqcld 13871	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤)↑2) ∈ ℂ)
150	149	mulid1d 11001	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · 1) = ((abs‘𝑤)↑2))
151	147, 150	breqtrd 5101	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · (3 / 4)) ≤ ((abs‘𝑤)↑2))
152	58, 65, 59, 131, 151	letrd 11141	. . . . . . . . . . . . . . 15 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ ((abs‘𝑤)↑2))
153	148	sqvald 13870	. . . . . . . . . . . . . . 15 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤)↑2) = ((abs‘𝑤) · (abs‘𝑤)))
154	152, 153	breqtrd 5101	. . . . . . . . . . . . . 14 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ ((abs‘𝑤) · (abs‘𝑤)))
155		absgt0 15045	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑤 ∈ ℂ → (𝑤 ≠ 0 ↔ 0 < (abs‘𝑤)))
156	155	ad2antrr 723	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 ≠ 0 ↔ 0 < (abs‘𝑤)))
157	53, 156	mpbid 231	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 0 < (abs‘𝑤))
158	48, 157	elrpd 12778	. . . . . . . . . . . . . . 15 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ∈ ℝ⁺)
159	57, 48, 158	lemul2d 12825	. . . . . . . . . . . . . 14 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ≤ (abs‘𝑤) ↔ ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ ((abs‘𝑤) · (abs‘𝑤))))
160	154, 159	mpbird 256	. . . . . . . . . . . . 13 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ≤ (abs‘𝑤))
161	160	ad2ant2l 743	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ≤ (abs‘𝑤))
162		simprl 768	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘𝑤) < 𝑥)
163	43, 44, 46, 161, 162	lelttrd 11142	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) < 𝑥)
164	34, 163	eqbrtrd 5097	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥)
165	164	ex 413	. . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → (((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
166	23, 165	sylbid 239	. . . . . . . 8 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → ((abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
167	166	adantld 491	. . . . . . 7 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → ((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1)) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
168	12, 167	sylan2b 594	. . . . . 6 ⊢ ((𝑥 ∈ ℝ⁺ ∧ 𝑤 ∈ (ℂ ∖ {0})) → ((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1)) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
169	168	ralrimiva 3104	. . . . 5 ⊢ (𝑥 ∈ ℝ⁺ → ∀𝑤 ∈ (ℂ ∖ {0})((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1)) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
170		brimralrspcev 5136	. . . . 5 ⊢ ((if(𝑥 ≤ 1, 𝑥, 1) ∈ ℝ⁺ ∧ ∀𝑤 ∈ (ℂ ∖ {0})((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1)) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥)) → ∃𝑦 ∈ ℝ⁺ ∀𝑤 ∈ (ℂ ∖ {0})((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < 𝑦) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
171	11, 169, 170	syl2anc 584	. . . 4 ⊢ (𝑥 ∈ ℝ⁺ → ∃𝑦 ∈ ℝ⁺ ∀𝑤 ∈ (ℂ ∖ {0})((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < 𝑦) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
172	171	rgen 3075	. . 3 ⊢ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ ℝ⁺ ∀𝑤 ∈ (ℂ ∖ {0})((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < 𝑦) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥)
173		eldifi 4062	. . . . . . . . . 10 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → 𝑧 ∈ ℂ)
174		efcl 15801	. . . . . . . . . 10 ⊢ (𝑧 ∈ ℂ → (exp‘𝑧) ∈ ℂ)
175	173, 174	syl 17	. . . . . . . . 9 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (exp‘𝑧) ∈ ℂ)
176		1cnd 10979	. . . . . . . . 9 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → 1 ∈ ℂ)
177	175, 176	subcld 11341	. . . . . . . 8 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → ((exp‘𝑧) − 1) ∈ ℂ)
178		eldifsni 4724	. . . . . . . 8 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → 𝑧 ≠ 0)
179	177, 173, 178	divcld 11760	. . . . . . 7 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (((exp‘𝑧) − 1) / 𝑧) ∈ ℂ)
180	30, 179	fmpti 6995	. . . . . 6 ⊢ (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)):(ℂ ∖ {0})⟶ℂ
181	180	a1i 11	. . . . 5 ⊢ (⊤ → (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)):(ℂ ∖ {0})⟶ℂ)
182		difssd 4068	. . . . 5 ⊢ (⊤ → (ℂ ∖ {0}) ⊆ ℂ)
183		0cnd 10977	. . . . 5 ⊢ (⊤ → 0 ∈ ℂ)
184	181, 182, 183	ellimc3 25052	. . . 4 ⊢ (⊤ → (1 ∈ ((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0) ↔ (1 ∈ ℂ ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ ℝ⁺ ∀𝑤 ∈ (ℂ ∖ {0})((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < 𝑦) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))))
185	184	mptru 1546	. . 3 ⊢ (1 ∈ ((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0) ↔ (1 ∈ ℂ ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ ℝ⁺ ∀𝑤 ∈ (ℂ ∖ {0})((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < 𝑦) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥)))
186	8, 172, 185	mpbir2an 708	. 2 ⊢ 1 ∈ ((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0)
187	2	cnfldtopon 23955	. . . . 5 ⊢ (TopOpen‘ℂ_fld) ∈ (TopOn‘ℂ)
188	187	toponrestid 22079	. . . 4 ⊢ (TopOpen‘ℂ_fld) = ((TopOpen‘ℂ_fld) ↾_t ℂ)
189	173	subid1d 11330	. . . . . . 7 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (𝑧 − 0) = 𝑧)
190	189	oveq2d 7300	. . . . . 6 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (((exp‘𝑧) − (exp‘0)) / (𝑧 − 0)) = (((exp‘𝑧) − (exp‘0)) / 𝑧))
191		ef0 15809	. . . . . . . 8 ⊢ (exp‘0) = 1
192	191	oveq2i 7295	. . . . . . 7 ⊢ ((exp‘𝑧) − (exp‘0)) = ((exp‘𝑧) − 1)
193	192	oveq1i 7294	. . . . . 6 ⊢ (((exp‘𝑧) − (exp‘0)) / 𝑧) = (((exp‘𝑧) − 1) / 𝑧)
194	190, 193	eqtr2di 2796	. . . . 5 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (((exp‘𝑧) − 1) / 𝑧) = (((exp‘𝑧) − (exp‘0)) / (𝑧 − 0)))
195	194	mpteq2ia 5178	. . . 4 ⊢ (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) = (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − (exp‘0)) / (𝑧 − 0)))
196		ssidd 3945	. . . 4 ⊢ (⊤ → ℂ ⊆ ℂ)
197		eff 15800	. . . . 5 ⊢ exp:ℂ⟶ℂ
198	197	a1i 11	. . . 4 ⊢ (⊤ → exp:ℂ⟶ℂ)
199	188, 2, 195, 196, 198, 196	eldv 25071	. . 3 ⊢ (⊤ → (0(ℂ D exp)1 ↔ (0 ∈ ((int‘(TopOpen‘ℂ_fld))‘ℂ) ∧ 1 ∈ ((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0))))
200	199	mptru 1546	. 2 ⊢ (0(ℂ D exp)1 ↔ (0 ∈ ((int‘(TopOpen‘ℂ_fld))‘ℂ) ∧ 1 ∈ ((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0)))
201	7, 186, 200	mpbir2an 708	1 ⊢ 0(ℂ D exp)1

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 = wceq 1539 ⊤wtru 1540 ∈ wcel 2107 ≠ wne 2944 ∀wral 3065 ∃wrex 3066 ∖ cdif 3885 ifcif 4460 {csn 4562 class class class wbr 5075 ↦ cmpt 5158 ⟶wf 6433 ‘cfv 6437 (class class class)co 7284 ℂcc 10878 ℝcr 10879 0cc0 10880 1c1 10881 + caddc 10883 · cmul 10885 < clt 11018 ≤ cle 11019 − cmin 11214 / cdiv 11641 ℕcn 11982 2c2 12037 3c3 12038 4c4 12039 ℕ₀cn0 12242 ℤ_≥cuz 12591 ℝ⁺crp 12739 ↑cexp 13791 !cfa 13996 abscabs 14954 Σcsu 15406 expce 15780 TopOpenctopn 17141 ℂ_fldccnfld 20606 Topctop 22051 intcnt 22177 lim_ℂ climc 25035 D cdv 25036

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2710 ax-rep 5210 ax-sep 5224 ax-nul 5231 ax-pow 5289 ax-pr 5353 ax-un 7597 ax-inf2 9408 ax-cnex 10936 ax-resscn 10937 ax-1cn 10938 ax-icn 10939 ax-addcl 10940 ax-addrcl 10941 ax-mulcl 10942 ax-mulrcl 10943 ax-mulcom 10944 ax-addass 10945 ax-mulass 10946 ax-distr 10947 ax-i2m1 10948 ax-1ne0 10949 ax-1rid 10950 ax-rnegex 10951 ax-rrecex 10952 ax-cnre 10953 ax-pre-lttri 10954 ax-pre-lttrn 10955 ax-pre-ltadd 10956 ax-pre-mulgt0 10957 ax-pre-sup 10958

This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2541 df-eu 2570 df-clab 2717 df-cleq 2731 df-clel 2817 df-nfc 2890 df-ne 2945 df-nel 3051 df-ral 3070 df-rex 3071 df-rmo 3072 df-reu 3073 df-rab 3074 df-v 3435 df-sbc 3718 df-csb 3834 df-dif 3891 df-un 3893 df-in 3895 df-ss 3905 df-pss 3907 df-nul 4258 df-if 4461 df-pw 4536 df-sn 4563 df-pr 4565 df-tp 4567 df-op 4569 df-uni 4841 df-int 4881 df-iun 4927 df-br 5076 df-opab 5138 df-mpt 5159 df-tr 5193 df-id 5490 df-eprel 5496 df-po 5504 df-so 5505 df-fr 5545 df-se 5546 df-we 5547 df-xp 5596 df-rel 5597 df-cnv 5598 df-co 5599 df-dm 5600 df-rn 5601 df-res 5602 df-ima 5603 df-pred 6206 df-ord 6273 df-on 6274 df-lim 6275 df-suc 6276 df-iota 6395 df-fun 6439 df-fn 6440 df-f 6441 df-f1 6442 df-fo 6443 df-f1o 6444 df-fv 6445 df-isom 6446 df-riota 7241 df-ov 7287 df-oprab 7288 df-mpo 7289 df-om 7722 df-1st 7840 df-2nd 7841 df-frecs 8106 df-wrecs 8137 df-recs 8211 df-rdg 8250 df-1o 8306 df-er 8507 df-map 8626 df-pm 8627 df-en 8743 df-dom 8744 df-sdom 8745 df-fin 8746 df-fi 9179 df-sup 9210 df-inf 9211 df-oi 9278 df-card 9706 df-pnf 11020 df-mnf 11021 df-xr 11022 df-ltxr 11023 df-le 11024 df-sub 11216 df-neg 11217 df-div 11642 df-nn 11983 df-2 12045 df-3 12046 df-4 12047 df-5 12048 df-6 12049 df-7 12050 df-8 12051 df-9 12052 df-n0 12243 df-z 12329 df-dec 12447 df-uz 12592 df-q 12698 df-rp 12740 df-xneg 12857 df-xadd 12858 df-xmul 12859 df-ico 13094 df-fz 13249 df-fzo 13392 df-fl 13521 df-seq 13731 df-exp 13792 df-fac 13997 df-hash 14054 df-shft 14787 df-cj 14819 df-re 14820 df-im 14821 df-sqrt 14955 df-abs 14956 df-limsup 15189 df-clim 15206 df-rlim 15207 df-sum 15407 df-ef 15786 df-struct 16857 df-slot 16892 df-ndx 16904 df-base 16922 df-plusg 16984 df-mulr 16985 df-starv 16986 df-tset 16990 df-ple 16991 df-ds 16993 df-unif 16994 df-rest 17142 df-topn 17143 df-topgen 17163 df-psmet 20598 df-xmet 20599 df-met 20600 df-bl 20601 df-mopn 20602 df-cnfld 20607 df-top 22052 df-topon 22069 df-topsp 22091 df-bases 22105 df-ntr 22180 df-cnp 22388 df-xms 23482 df-ms 23483 df-limc 25039 df-dv 25040

This theorem is referenced by: dvef 25153

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