dveflem - Metamath Proof Explorer

	Metamath Proof Explorer		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > dveflem		Structured version Visualization version GIF version

Theorem dveflem 23742

Description: Derivative of the exponential function at 0. The key step in the proof is eftlub 14839, 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 10032	. . 3 ⊢ 0 ∈ ℂ
2		eqid 2622	. . . . 5 ⊢ (TopOpen‘ℂ_fld) = (TopOpen‘ℂ_fld)
3	2	cnfldtop 22587	. . . 4 ⊢ (TopOpen‘ℂ_fld) ∈ Top
4	2	cnfldtopon 22586	. . . . . 6 ⊢ (TopOpen‘ℂ_fld) ∈ (TopOn‘ℂ)
5	4	toponunii 20721	. . . . 5 ⊢ ℂ = ∪ (TopOpen‘ℂ_fld)
6	5	ntrtop 20874	. . . 4 ⊢ ((TopOpen‘ℂ_fld) ∈ Top → ((int‘(TopOpen‘ℂ_fld))‘ℂ) = ℂ)
7	3, 6	ax-mp 5	. . 3 ⊢ ((int‘(TopOpen‘ℂ_fld))‘ℂ) = ℂ
8	1, 7	eleqtrri 2700	. 2 ⊢ 0 ∈ ((int‘(TopOpen‘ℂ_fld))‘ℂ)
9		ax-1cn 9994	. . 3 ⊢ 1 ∈ ℂ
10		1rp 11836	. . . . . 6 ⊢ 1 ∈ ℝ⁺
11		ifcl 4130	. . . . . 6 ⊢ ((𝑥 ∈ ℝ⁺ ∧ 1 ∈ ℝ⁺) → if(𝑥 ≤ 1, 𝑥, 1) ∈ ℝ⁺)
12	10, 11	mpan2 707	. . . . 5 ⊢ (𝑥 ∈ ℝ⁺ → if(𝑥 ≤ 1, 𝑥, 1) ∈ ℝ⁺)
13		eldifsn 4317	. . . . . . 7 ⊢ (𝑤 ∈ (ℂ ∖ {0}) ↔ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0))
14		simprl 794	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → 𝑤 ∈ ℂ)
15	14	subid1d 10381	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → (𝑤 − 0) = 𝑤)
16	15	fveq2d 6195	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → (abs‘(𝑤 − 0)) = (abs‘𝑤))
17	16	breq1d 4663	. . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → ((abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1) ↔ (abs‘𝑤) < if(𝑥 ≤ 1, 𝑥, 1)))
18	14	abscld 14175	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → (abs‘𝑤) ∈ ℝ)
19		rpre 11839	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ ℝ⁺ → 𝑥 ∈ ℝ)
20	19	adantr 481	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → 𝑥 ∈ ℝ)
21		1red 10055	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → 1 ∈ ℝ)
22		ltmin 12025	. . . . . . . . . . 11 ⊢ (((abs‘𝑤) ∈ ℝ ∧ 𝑥 ∈ ℝ ∧ 1 ∈ ℝ) → ((abs‘𝑤) < if(𝑥 ≤ 1, 𝑥, 1) ↔ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)))
23	18, 20, 21, 22	syl3anc 1326	. . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → ((abs‘𝑤) < if(𝑥 ≤ 1, 𝑥, 1) ↔ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)))
24	17, 23	bitrd 268	. . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → ((abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1) ↔ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)))
25		simplr 792	. . . . . . . . . . . . . . 15 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0))
26	25, 13	sylibr 224	. . . . . . . . . . . . . 14 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑤 ∈ (ℂ ∖ {0}))
27		fveq2 6191	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 = 𝑤 → (exp‘𝑧) = (exp‘𝑤))
28	27	oveq1d 6665	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 = 𝑤 → ((exp‘𝑧) − 1) = ((exp‘𝑤) − 1))
29		id 22	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 = 𝑤 → 𝑧 = 𝑤)
30	28, 29	oveq12d 6668	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = 𝑤 → (((exp‘𝑧) − 1) / 𝑧) = (((exp‘𝑤) − 1) / 𝑤))
31		eqid 2622	. . . . . . . . . . . . . . 15 ⊢ (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) = (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))
32		ovex 6678	. . . . . . . . . . . . . . 15 ⊢ (((exp‘𝑤) − 1) / 𝑤) ∈ V
33	30, 31, 32	fvmpt 6282	. . . . . . . . . . . . . 14 ⊢ (𝑤 ∈ (ℂ ∖ {0}) → ((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) = (((exp‘𝑤) − 1) / 𝑤))
34	26, 33	syl 17	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → ((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) = (((exp‘𝑤) − 1) / 𝑤))
35	34	oveq1d 6665	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1) = ((((exp‘𝑤) − 1) / 𝑤) − 1))
36	35	fveq2d 6195	. . . . . . . . . . 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)))
37		simplrl 800	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑤 ∈ ℂ)
38		efcl 14813	. . . . . . . . . . . . . . . . 17 ⊢ (𝑤 ∈ ℂ → (exp‘𝑤) ∈ ℂ)
39	37, 38	syl 17	. . . . . . . . . . . . . . . 16 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (exp‘𝑤) ∈ ℂ)
40		1cnd 10056	. . . . . . . . . . . . . . . 16 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 1 ∈ ℂ)
41	39, 40	subcld 10392	. . . . . . . . . . . . . . 15 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → ((exp‘𝑤) − 1) ∈ ℂ)
42		simplrr 801	. . . . . . . . . . . . . . 15 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑤 ≠ 0)
43	41, 37, 42	divcld 10801	. . . . . . . . . . . . . 14 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (((exp‘𝑤) − 1) / 𝑤) ∈ ℂ)
44	43, 40	subcld 10392	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → ((((exp‘𝑤) − 1) / 𝑤) − 1) ∈ ℂ)
45	44	abscld 14175	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ∈ ℝ)
46	37	abscld 14175	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘𝑤) ∈ ℝ)
47		simpll 790	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑥 ∈ ℝ⁺)
48	47	rpred 11872	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑥 ∈ ℝ)
49		abscl 14018	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑤 ∈ ℂ → (abs‘𝑤) ∈ ℝ)
50	49	ad2antrr 762	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ∈ ℝ)
51	38	ad2antrr 762	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) ∈ ℂ)
52		subcl 10280	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((exp‘𝑤) ∈ ℂ ∧ 1 ∈ ℂ) → ((exp‘𝑤) − 1) ∈ ℂ)
53	51, 9, 52	sylancl 694	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((exp‘𝑤) − 1) ∈ ℂ)
54		simpll 790	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 𝑤 ∈ ℂ)
55		simplr 792	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 𝑤 ≠ 0)
56	53, 54, 55	divcld 10801	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) / 𝑤) ∈ ℂ)
57		1cnd 10056	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 1 ∈ ℂ)
58	56, 57	subcld 10392	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) / 𝑤) − 1) ∈ ℂ)
59	58	abscld 14175	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ∈ ℝ)
60	50, 59	remulcld 10070	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ∈ ℝ)
61	50	resqcld 13035	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤)↑2) ∈ ℝ)
62		3re 11094	. . . . . . . . . . . . . . . . . 18 ⊢ 3 ∈ ℝ
63		4nn 11187	. . . . . . . . . . . . . . . . . 18 ⊢ 4 ∈ ℕ
64		nndivre 11056	. . . . . . . . . . . . . . . . . 18 ⊢ ((3 ∈ ℝ ∧ 4 ∈ ℕ) → (3 / 4) ∈ ℝ)
65	62, 63, 64	mp2an 708	. . . . . . . . . . . . . . . . 17 ⊢ (3 / 4) ∈ ℝ
66		remulcl 10021	. . . . . . . . . . . . . . . . 17 ⊢ ((((abs‘𝑤)↑2) ∈ ℝ ∧ (3 / 4) ∈ ℝ) → (((abs‘𝑤)↑2) · (3 / 4)) ∈ ℝ)
67	61, 65, 66	sylancl 694	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · (3 / 4)) ∈ ℝ)
68	53, 54	subcld 10392	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) − 𝑤) ∈ ℂ)
69	68, 54, 55	divcan2d 10803	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 · ((((exp‘𝑤) − 1) − 𝑤) / 𝑤)) = (((exp‘𝑤) − 1) − 𝑤))
70	53, 54, 54, 55	divsubdird 10840	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) − 𝑤) / 𝑤) = ((((exp‘𝑤) − 1) / 𝑤) − (𝑤 / 𝑤)))
71	54, 55	dividd 10799	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 / 𝑤) = 1)
72	71	oveq2d 6666	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) / 𝑤) − (𝑤 / 𝑤)) = ((((exp‘𝑤) − 1) / 𝑤) − 1))
73	70, 72	eqtrd 2656	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) − 𝑤) / 𝑤) = ((((exp‘𝑤) − 1) / 𝑤) − 1))
74	73	oveq2d 6666	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 · ((((exp‘𝑤) − 1) − 𝑤) / 𝑤)) = (𝑤 · ((((exp‘𝑤) − 1) / 𝑤) − 1)))
75	51, 57, 54	subsub4d 10423	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) − 𝑤) = ((exp‘𝑤) − (1 + 𝑤)))
76		eqid 2622	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛))) = (𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))
77		df-2 11079	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ 2 = (1 + 1)
78		1nn0 11308	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ 1 ∈ ℕ₀
79		1e0p1 11552	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ 1 = (0 + 1)
80		0nn0 11307	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ 0 ∈ ℕ₀
81		0cnd 10033	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 0 ∈ ℂ)
82	76	efval2 14814	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ (𝑤 ∈ ℂ → (exp‘𝑤) = Σ𝑘 ∈ ℕ₀ ((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
83	82	ad2antrr 762	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = Σ𝑘 ∈ ℕ₀ ((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
84		nn0uz 11722	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ ℕ₀ = (ℤ_≥‘0)
85	84	sumeq1i 14428	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ Σ𝑘 ∈ ℕ₀ ((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) = Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)
86	83, 85	syl6req 2673	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) = (exp‘𝑤))
87	86	oveq2d 6666	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (0 + Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)) = (0 + (exp‘𝑤)))
88	51	addid2d 10237	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (0 + (exp‘𝑤)) = (exp‘𝑤))
89	87, 88	eqtr2d 2657	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = (0 + Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)))
90		eft0val 14842	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (𝑤 ∈ ℂ → ((𝑤↑0) / (!‘0)) = 1)
91	90	ad2antrr 762	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑0) / (!‘0)) = 1)
92	91	oveq2d 6666	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (0 + ((𝑤↑0) / (!‘0))) = (0 + 1))
93	92, 79	syl6eqr 2674	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (0 + ((𝑤↑0) / (!‘0))) = 1)
94	76, 79, 80, 54, 81, 89, 93	efsep 14840	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = (1 + Σ𝑘 ∈ (ℤ_≥‘1)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)))
95		exp1 12866	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ (𝑤 ∈ ℂ → (𝑤↑1) = 𝑤)
96	95	ad2antrr 762	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤↑1) = 𝑤)
97	96	oveq1d 6665	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑1) / (!‘1)) = (𝑤 / (!‘1)))
98		fac1 13064	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (!‘1) = 1
99	98	oveq2i 6661	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (𝑤 / (!‘1)) = (𝑤 / 1)
100	97, 99	syl6eq 2672	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑1) / (!‘1)) = (𝑤 / 1))
101		div1 10716	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (𝑤 ∈ ℂ → (𝑤 / 1) = 𝑤)
102	101	ad2antrr 762	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 / 1) = 𝑤)
103	100, 102	eqtrd 2656	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑1) / (!‘1)) = 𝑤)
104	103	oveq2d 6666	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (1 + ((𝑤↑1) / (!‘1))) = (1 + 𝑤))
105	76, 77, 78, 54, 57, 94, 104	efsep 14840	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = ((1 + 𝑤) + Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)))
106	105	eqcomd 2628	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((1 + 𝑤) + Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)) = (exp‘𝑤))
107		addcl 10018	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((1 ∈ ℂ ∧ 𝑤 ∈ ℂ) → (1 + 𝑤) ∈ ℂ)
108	9, 54, 107	sylancr 695	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (1 + 𝑤) ∈ ℂ)
109		2nn0 11309	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ 2 ∈ ℕ₀
110	76	eftlcl 14837	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((𝑤 ∈ ℂ ∧ 2 ∈ ℕ₀) → Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) ∈ ℂ)
111	54, 109, 110	sylancl 694	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) ∈ ℂ)
112	51, 108, 111	subaddd 10410	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − (1 + 𝑤)) = Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) ↔ ((1 + 𝑤) + Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)) = (exp‘𝑤)))
113	106, 112	mpbird 247	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((exp‘𝑤) − (1 + 𝑤)) = Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
114	75, 113	eqtrd 2656	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) − 𝑤) = Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
115	69, 74, 114	3eqtr3d 2664	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 · ((((exp‘𝑤) − 1) / 𝑤) − 1)) = Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
116	115	fveq2d 6195	. . . . . . . . . . . . . . . . . . 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)))
117	54, 58	absmuld 14193	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘(𝑤 · ((((exp‘𝑤) − 1) / 𝑤) − 1))) = ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))))
118	116, 117	eqtr3d 2658	. . . . . . . . . . . . . . . . . 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))))
119		eqid 2622	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑛 ∈ ℕ₀ ↦ (((abs‘𝑤)↑𝑛) / (!‘𝑛))) = (𝑛 ∈ ℕ₀ ↦ (((abs‘𝑤)↑𝑛) / (!‘𝑛)))
120		eqid 2622	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑛 ∈ ℕ₀ ↦ ((((abs‘𝑤)↑2) / (!‘2)) · ((1 / (2 + 1))↑𝑛))) = (𝑛 ∈ ℕ₀ ↦ ((((abs‘𝑤)↑2) / (!‘2)) · ((1 / (2 + 1))↑𝑛)))
121		2nn 11185	. . . . . . . . . . . . . . . . . . . 20 ⊢ 2 ∈ ℕ
122	121	a1i 11	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 2 ∈ ℕ)
123		1red 10055	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 1 ∈ ℝ)
124		simpr 477	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) < 1)
125	50, 123, 124	ltled 10185	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ≤ 1)
126	76, 119, 120, 122, 54, 125	eftlub 14839	. . . . . . . . . . . . . . . . . 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))))
127	118, 126	eqbrtrrd 4677	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ (((abs‘𝑤)↑2) · ((2 + 1) / ((!‘2) · 2))))
128		df-3 11080	. . . . . . . . . . . . . . . . . . 19 ⊢ 3 = (2 + 1)
129		fac2 13066	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (!‘2) = 2
130	129	oveq1i 6660	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((!‘2) · 2) = (2 · 2)
131		2t2e4 11177	. . . . . . . . . . . . . . . . . . . 20 ⊢ (2 · 2) = 4
132	130, 131	eqtr2i 2645	. . . . . . . . . . . . . . . . . . 19 ⊢ 4 = ((!‘2) · 2)
133	128, 132	oveq12i 6662	. . . . . . . . . . . . . . . . . 18 ⊢ (3 / 4) = ((2 + 1) / ((!‘2) · 2))
134	133	oveq2i 6661	. . . . . . . . . . . . . . . . 17 ⊢ (((abs‘𝑤)↑2) · (3 / 4)) = (((abs‘𝑤)↑2) · ((2 + 1) / ((!‘2) · 2)))
135	127, 134	syl6breqr 4695	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ (((abs‘𝑤)↑2) · (3 / 4)))
136	65	a1i 11	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (3 / 4) ∈ ℝ)
137	50	sqge0d 13036	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 0 ≤ ((abs‘𝑤)↑2))
138		1re 10039	. . . . . . . . . . . . . . . . . . . 20 ⊢ 1 ∈ ℝ
139		3lt4 11197	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ 3 < 4
140		4cn 11098	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ 4 ∈ ℂ
141	140	mulid1i 10042	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (4 · 1) = 4
142	139, 141	breqtrri 4680	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 3 < (4 · 1)
143		4re 11097	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ 4 ∈ ℝ
144		4pos 11116	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ 0 < 4
145	143, 144	pm3.2i 471	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (4 ∈ ℝ ∧ 0 < 4)
146		ltdivmul 10898	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((3 ∈ ℝ ∧ 1 ∈ ℝ ∧ (4 ∈ ℝ ∧ 0 < 4)) → ((3 / 4) < 1 ↔ 3 < (4 · 1)))
147	62, 138, 145, 146	mp3an 1424	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((3 / 4) < 1 ↔ 3 < (4 · 1))
148	142, 147	mpbir 221	. . . . . . . . . . . . . . . . . . . 20 ⊢ (3 / 4) < 1
149	65, 138, 148	ltleii 10160	. . . . . . . . . . . . . . . . . . 19 ⊢ (3 / 4) ≤ 1
150	149	a1i 11	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (3 / 4) ≤ 1)
151	136, 123, 61, 137, 150	lemul2ad 10964	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · (3 / 4)) ≤ (((abs‘𝑤)↑2) · 1))
152	50	recnd 10068	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ∈ ℂ)
153	152	sqcld 13006	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤)↑2) ∈ ℂ)
154	153	mulid1d 10057	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · 1) = ((abs‘𝑤)↑2))
155	151, 154	breqtrd 4679	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · (3 / 4)) ≤ ((abs‘𝑤)↑2))
156	60, 67, 61, 135, 155	letrd 10194	. . . . . . . . . . . . . . 15 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ ((abs‘𝑤)↑2))
157	152	sqvald 13005	. . . . . . . . . . . . . . 15 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤)↑2) = ((abs‘𝑤) · (abs‘𝑤)))
158	156, 157	breqtrd 4679	. . . . . . . . . . . . . 14 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ ((abs‘𝑤) · (abs‘𝑤)))
159		absgt0 14064	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑤 ∈ ℂ → (𝑤 ≠ 0 ↔ 0 < (abs‘𝑤)))
160	159	ad2antrr 762	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 ≠ 0 ↔ 0 < (abs‘𝑤)))
161	55, 160	mpbid 222	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 0 < (abs‘𝑤))
162	50, 161	elrpd 11869	. . . . . . . . . . . . . . 15 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ∈ ℝ⁺)
163	59, 50, 162	lemul2d 11916	. . . . . . . . . . . . . 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))))
164	158, 163	mpbird 247	. . . . . . . . . . . . 13 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ≤ (abs‘𝑤))
165	164	ad2ant2l 782	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ≤ (abs‘𝑤))
166		simprl 794	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘𝑤) < 𝑥)
167	45, 46, 48, 165, 166	lelttrd 10195	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) < 𝑥)
168	36, 167	eqbrtrd 4675	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥)
169	168	ex 450	. . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → (((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
170	24, 169	sylbid 230	. . . . . . . 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))
171	170	adantld 483	. . . . . . 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))
172	13, 171	sylan2b 492	. . . . . 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))
173	172	ralrimiva 2966	. . . . 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))
174		breq2 4657	. . . . . . . . 9 ⊢ (𝑦 = if(𝑥 ≤ 1, 𝑥, 1) → ((abs‘(𝑤 − 0)) < 𝑦 ↔ (abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1)))
175	174	anbi2d 740	. . . . . . . 8 ⊢ (𝑦 = if(𝑥 ≤ 1, 𝑥, 1) → ((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < 𝑦) ↔ (𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1))))
176	175	imbi1d 331	. . . . . . 7 ⊢ (𝑦 = if(𝑥 ≤ 1, 𝑥, 1) → (((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < 𝑦) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥) ↔ ((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1)) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥)))
177	176	ralbidv 2986	. . . . . 6 ⊢ (𝑦 = if(𝑥 ≤ 1, 𝑥, 1) → (∀𝑤 ∈ (ℂ ∖ {0})((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < 𝑦) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥) ↔ ∀𝑤 ∈ (ℂ ∖ {0})((𝑤 ≠ 0 ∧ (abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1)) → (abs‘(((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥)))
178	177	rspcev 3309	. . . . 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))
179	12, 173, 178	syl2anc 693	. . . 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))
180	179	rgen 2922	. . 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)
181		eldifi 3732	. . . . . . . . . 10 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → 𝑧 ∈ ℂ)
182		efcl 14813	. . . . . . . . . 10 ⊢ (𝑧 ∈ ℂ → (exp‘𝑧) ∈ ℂ)
183	181, 182	syl 17	. . . . . . . . 9 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (exp‘𝑧) ∈ ℂ)
184		1cnd 10056	. . . . . . . . 9 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → 1 ∈ ℂ)
185	183, 184	subcld 10392	. . . . . . . 8 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → ((exp‘𝑧) − 1) ∈ ℂ)
186		eldifsni 4320	. . . . . . . 8 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → 𝑧 ≠ 0)
187	185, 181, 186	divcld 10801	. . . . . . 7 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (((exp‘𝑧) − 1) / 𝑧) ∈ ℂ)
188	31, 187	fmpti 6383	. . . . . 6 ⊢ (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)):(ℂ ∖ {0})⟶ℂ
189	188	a1i 11	. . . . 5 ⊢ (⊤ → (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)):(ℂ ∖ {0})⟶ℂ)
190		difssd 3738	. . . . 5 ⊢ (⊤ → (ℂ ∖ {0}) ⊆ ℂ)
191		0cnd 10033	. . . . 5 ⊢ (⊤ → 0 ∈ ℂ)
192	189, 190, 191	ellimc3 23643	. . . 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))))
193	192	trud 1493	. . 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)))
194	9, 180, 193	mpbir2an 955	. 2 ⊢ 1 ∈ ((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0)
195	5	restid 16094	. . . . . 6 ⊢ ((TopOpen‘ℂ_fld) ∈ Top → ((TopOpen‘ℂ_fld) ↾_t ℂ) = (TopOpen‘ℂ_fld))
196	3, 195	ax-mp 5	. . . . 5 ⊢ ((TopOpen‘ℂ_fld) ↾_t ℂ) = (TopOpen‘ℂ_fld)
197	196	eqcomi 2631	. . . 4 ⊢ (TopOpen‘ℂ_fld) = ((TopOpen‘ℂ_fld) ↾_t ℂ)
198	181	subid1d 10381	. . . . . . 7 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (𝑧 − 0) = 𝑧)
199	198	oveq2d 6666	. . . . . 6 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (((exp‘𝑧) − (exp‘0)) / (𝑧 − 0)) = (((exp‘𝑧) − (exp‘0)) / 𝑧))
200		ef0 14821	. . . . . . . 8 ⊢ (exp‘0) = 1
201	200	oveq2i 6661	. . . . . . 7 ⊢ ((exp‘𝑧) − (exp‘0)) = ((exp‘𝑧) − 1)
202	201	oveq1i 6660	. . . . . 6 ⊢ (((exp‘𝑧) − (exp‘0)) / 𝑧) = (((exp‘𝑧) − 1) / 𝑧)
203	199, 202	syl6req 2673	. . . . 5 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (((exp‘𝑧) − 1) / 𝑧) = (((exp‘𝑧) − (exp‘0)) / (𝑧 − 0)))
204	203	mpteq2ia 4740	. . . 4 ⊢ (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) = (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − (exp‘0)) / (𝑧 − 0)))
205		ssid 3624	. . . . 5 ⊢ ℂ ⊆ ℂ
206	205	a1i 11	. . . 4 ⊢ (⊤ → ℂ ⊆ ℂ)
207		eff 14812	. . . . 5 ⊢ exp:ℂ⟶ℂ
208	207	a1i 11	. . . 4 ⊢ (⊤ → exp:ℂ⟶ℂ)
209	197, 2, 204, 206, 208, 206	eldv 23662	. . 3 ⊢ (⊤ → (0(ℂ D exp)1 ↔ (0 ∈ ((int‘(TopOpen‘ℂ_fld))‘ℂ) ∧ 1 ∈ ((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0))))
210	209	trud 1493	. 2 ⊢ (0(ℂ D exp)1 ↔ (0 ∈ ((int‘(TopOpen‘ℂ_fld))‘ℂ) ∧ 1 ∈ ((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0)))
211	8, 194, 210	mpbir2an 955	1 ⊢ 0(ℂ D exp)1

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 196 ∧ wa 384 = wceq 1483 ⊤wtru 1484 ∈ wcel 1990 ≠ wne 2794 ∀wral 2912 ∃wrex 2913 ∖ cdif 3571 ⊆ wss 3574 ifcif 4086 {csn 4177 class class class wbr 4653 ↦ cmpt 4729 ⟶wf 5884 ‘cfv 5888 (class class class)co 6650 ℂcc 9934 ℝcr 9935 0cc0 9936 1c1 9937 + caddc 9939 · cmul 9941 < clt 10074 ≤ cle 10075 − cmin 10266 / cdiv 10684 ℕcn 11020 2c2 11070 3c3 11071 4c4 11072 ℕ₀cn0 11292 ℤ_≥cuz 11687 ℝ⁺crp 11832 ↑cexp 12860 !cfa 13060 abscabs 13974 Σcsu 14416 expce 14792 ↾_t crest 16081 TopOpenctopn 16082 ℂ_fldccnfld 19746 Topctop 20698 intcnt 20821 lim_ℂ climc 23626 D cdv 23627

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-rep 4771 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-inf2 8538 ax-cnex 9992 ax-resscn 9993 ax-1cn 9994 ax-icn 9995 ax-addcl 9996 ax-addrcl 9997 ax-mulcl 9998 ax-mulrcl 9999 ax-mulcom 10000 ax-addass 10001 ax-mulass 10002 ax-distr 10003 ax-i2m1 10004 ax-1ne0 10005 ax-1rid 10006 ax-rnegex 10007 ax-rrecex 10008 ax-cnre 10009 ax-pre-lttri 10010 ax-pre-lttrn 10011 ax-pre-ltadd 10012 ax-pre-mulgt0 10013 ax-pre-sup 10014 ax-addf 10015 ax-mulf 10016

This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-fal 1489 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-nel 2898 df-ral 2917 df-rex 2918 df-reu 2919 df-rmo 2920 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-tp 4182 df-op 4184 df-uni 4437 df-int 4476 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-se 5074 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 df-ord 5726 df-on 5727 df-lim 5728 df-suc 5729 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-isom 5897 df-riota 6611 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-om 7066 df-1st 7168 df-2nd 7169 df-wrecs 7407 df-recs 7468 df-rdg 7506 df-1o 7560 df-oadd 7564 df-er 7742 df-map 7859 df-pm 7860 df-en 7956 df-dom 7957 df-sdom 7958 df-fin 7959 df-fi 8317 df-sup 8348 df-inf 8349 df-oi 8415 df-card 8765 df-pnf 10076 df-mnf 10077 df-xr 10078 df-ltxr 10079 df-le 10080 df-sub 10268 df-neg 10269 df-div 10685 df-nn 11021 df-2 11079 df-3 11080 df-4 11081 df-5 11082 df-6 11083 df-7 11084 df-8 11085 df-9 11086 df-n0 11293 df-z 11378 df-dec 11494 df-uz 11688 df-q 11789 df-rp 11833 df-xneg 11946 df-xadd 11947 df-xmul 11948 df-ico 12181 df-fz 12327 df-fzo 12466 df-fl 12593 df-seq 12802 df-exp 12861 df-fac 13061 df-hash 13118 df-shft 13807 df-cj 13839 df-re 13840 df-im 13841 df-sqrt 13975 df-abs 13976 df-limsup 14202 df-clim 14219 df-rlim 14220 df-sum 14417 df-ef 14798 df-struct 15859 df-ndx 15860 df-slot 15861 df-base 15863 df-plusg 15954 df-mulr 15955 df-starv 15956 df-tset 15960 df-ple 15961 df-ds 15964 df-unif 15965 df-rest 16083 df-topn 16084 df-topgen 16104 df-psmet 19738 df-xmet 19739 df-met 19740 df-bl 19741 df-mopn 19742 df-cnfld 19747 df-top 20699 df-topon 20716 df-topsp 20737 df-bases 20750 df-ntr 20824 df-cnp 21032 df-xms 22125 df-ms 22126 df-limc 23630 df-dv 23631

This theorem is referenced by: dvef 23743

W3C validator