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Theorem dveflem 23546

Description: Derivative of the exponential function at 0. The key step in the proof is eftlub 14678, 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 9911	. . 3 ⊢ 0 ∈ ℂ
2		eqid 2610	. . . . 5 ⊢ (TopOpen‘ℂ_fld) = (TopOpen‘ℂ_fld)
3	2	cnfldtop 22397	. . . 4 ⊢ (TopOpen‘ℂ_fld) ∈ Top
4	2	cnfldtopon 22396	. . . . . 6 ⊢ (TopOpen‘ℂ_fld) ∈ (TopOn‘ℂ)
5	4	toponunii 20547	. . . . 5 ⊢ ℂ = ∪ (TopOpen‘ℂ_fld)
6	5	ntrtop 20684	. . . 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 2687	. 2 ⊢ 0 ∈ ((int‘(TopOpen‘ℂ_fld))‘ℂ)
9		ax-1cn 9873	. . 3 ⊢ 1 ∈ ℂ
10		1rp 11712	. . . . . 6 ⊢ 1 ∈ ℝ⁺
11		ifcl 4080	. . . . . 6 ⊢ ((𝑥 ∈ ℝ⁺ ∧ 1 ∈ ℝ⁺) → if(𝑥 ≤ 1, 𝑥, 1) ∈ ℝ⁺)
12	10, 11	mpan2 703	. . . . 5 ⊢ (𝑥 ∈ ℝ⁺ → if(𝑥 ≤ 1, 𝑥, 1) ∈ ℝ⁺)
13		eldifsn 4260	. . . . . . 7 ⊢ (𝑤 ∈ (ℂ ∖ {0}) ↔ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0))
14		simprl 790	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → 𝑤 ∈ ℂ)
15	14	subid1d 10260	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → (𝑤 − 0) = 𝑤)
16	15	fveq2d 6107	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → (abs‘(𝑤 − 0)) = (abs‘𝑤))
17	16	breq1d 4593	. . . . . . . . . 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 14023	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → (abs‘𝑤) ∈ ℝ)
19		rpre 11715	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ ℝ⁺ → 𝑥 ∈ ℝ)
20	19	adantr 480	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → 𝑥 ∈ ℝ)
21		1red 9934	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → 1 ∈ ℝ)
22		ltmin 11899	. . . . . . . . . . 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 1318	. . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → ((abs‘𝑤) < if(𝑥 ≤ 1, 𝑥, 1) ↔ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)))
24	17, 23	bitrd 267	. . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) → ((abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1) ↔ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)))
25		simplr 788	. . . . . . . . . . . . . . 15 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0))
26	25, 13	sylibr 223	. . . . . . . . . . . . . 14 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑤 ∈ (ℂ ∖ {0}))
27		fveq2 6103	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 = 𝑤 → (exp‘𝑧) = (exp‘𝑤))
28	27	oveq1d 6564	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 = 𝑤 → ((exp‘𝑧) − 1) = ((exp‘𝑤) − 1))
29		id 22	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 = 𝑤 → 𝑧 = 𝑤)
30	28, 29	oveq12d 6567	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = 𝑤 → (((exp‘𝑧) − 1) / 𝑧) = (((exp‘𝑤) − 1) / 𝑤))
31		eqid 2610	. . . . . . . . . . . . . . 15 ⊢ (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) = (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧))
32		ovex 6577	. . . . . . . . . . . . . . 15 ⊢ (((exp‘𝑤) − 1) / 𝑤) ∈ V
33	30, 31, 32	fvmpt 6191	. . . . . . . . . . . . . 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 6564	. . . . . . . . . . . 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 6107	. . . . . . . . . . 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 796	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑤 ∈ ℂ)
38		efcl 14652	. . . . . . . . . . . . . . . . 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 9935	. . . . . . . . . . . . . . . 16 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 1 ∈ ℂ)
41	39, 40	subcld 10271	. . . . . . . . . . . . . . 15 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → ((exp‘𝑤) − 1) ∈ ℂ)
42		simplrr 797	. . . . . . . . . . . . . . 15 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑤 ≠ 0)
43	41, 37, 42	divcld 10680	. . . . . . . . . . . . . 14 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (((exp‘𝑤) − 1) / 𝑤) ∈ ℂ)
44	43, 40	subcld 10271	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → ((((exp‘𝑤) − 1) / 𝑤) − 1) ∈ ℂ)
45	44	abscld 14023	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ∈ ℝ)
46	37	abscld 14023	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘𝑤) ∈ ℝ)
47		simpll 786	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑥 ∈ ℝ⁺)
48	47	rpred 11748	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑥 ∈ ℝ)
49		abscl 13866	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑤 ∈ ℂ → (abs‘𝑤) ∈ ℝ)
50	49	ad2antrr 758	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ∈ ℝ)
51	38	ad2antrr 758	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) ∈ ℂ)
52		subcl 10159	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((exp‘𝑤) ∈ ℂ ∧ 1 ∈ ℂ) → ((exp‘𝑤) − 1) ∈ ℂ)
53	51, 9, 52	sylancl 693	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((exp‘𝑤) − 1) ∈ ℂ)
54		simpll 786	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 𝑤 ∈ ℂ)
55		simplr 788	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 𝑤 ≠ 0)
56	53, 54, 55	divcld 10680	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) / 𝑤) ∈ ℂ)
57		1cnd 9935	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 1 ∈ ℂ)
58	56, 57	subcld 10271	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) / 𝑤) − 1) ∈ ℂ)
59	58	abscld 14023	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ∈ ℝ)
60	50, 59	remulcld 9949	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ∈ ℝ)
61	50	resqcld 12897	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤)↑2) ∈ ℝ)
62		3re 10971	. . . . . . . . . . . . . . . . . 18 ⊢ 3 ∈ ℝ
63		4nn 11064	. . . . . . . . . . . . . . . . . 18 ⊢ 4 ∈ ℕ
64		nndivre 10933	. . . . . . . . . . . . . . . . . 18 ⊢ ((3 ∈ ℝ ∧ 4 ∈ ℕ) → (3 / 4) ∈ ℝ)
65	62, 63, 64	mp2an 704	. . . . . . . . . . . . . . . . 17 ⊢ (3 / 4) ∈ ℝ
66		remulcl 9900	. . . . . . . . . . . . . . . . 17 ⊢ ((((abs‘𝑤)↑2) ∈ ℝ ∧ (3 / 4) ∈ ℝ) → (((abs‘𝑤)↑2) · (3 / 4)) ∈ ℝ)
67	61, 65, 66	sylancl 693	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · (3 / 4)) ∈ ℝ)
68	53, 54	subcld 10271	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) − 𝑤) ∈ ℂ)
69	68, 54, 55	divcan2d 10682	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 · ((((exp‘𝑤) − 1) − 𝑤) / 𝑤)) = (((exp‘𝑤) − 1) − 𝑤))
70	53, 54, 54, 55	divsubdird 10719	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) − 𝑤) / 𝑤) = ((((exp‘𝑤) − 1) / 𝑤) − (𝑤 / 𝑤)))
71	54, 55	dividd 10678	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 / 𝑤) = 1)
72	71	oveq2d 6565	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) / 𝑤) − (𝑤 / 𝑤)) = ((((exp‘𝑤) − 1) / 𝑤) − 1))
73	70, 72	eqtrd 2644	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) − 𝑤) / 𝑤) = ((((exp‘𝑤) − 1) / 𝑤) − 1))
74	73	oveq2d 6565	. . . . . . . . . . . . . . . . . . . . 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 10302	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) − 𝑤) = ((exp‘𝑤) − (1 + 𝑤)))
76		eqid 2610	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛))) = (𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))
77		df-2 10956	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ 2 = (1 + 1)
78		1nn0 11185	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ 1 ∈ ℕ₀
79		1e0p1 11428	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ 1 = (0 + 1)
80		0nn0 11184	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ 0 ∈ ℕ₀
81		0cnd 9912	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 0 ∈ ℂ)
82	76	efval2 14653	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ (𝑤 ∈ ℂ → (exp‘𝑤) = Σ𝑘 ∈ ℕ₀ ((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
83	82	ad2antrr 758	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = Σ𝑘 ∈ ℕ₀ ((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
84		nn0uz 11598	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ ℕ₀ = (ℤ_≥‘0)
85	84	sumeq1i 14276	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ Σ𝑘 ∈ ℕ₀ ((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) = Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)
86	83, 85	syl6req 2661	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) = (exp‘𝑤))
87	86	oveq2d 6565	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (0 + Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)) = (0 + (exp‘𝑤)))
88	51	addid2d 10116	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (0 + (exp‘𝑤)) = (exp‘𝑤))
89	87, 88	eqtr2d 2645	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = (0 + Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)))
90		eft0val 14681	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (𝑤 ∈ ℂ → ((𝑤↑0) / (!‘0)) = 1)
91	90	ad2antrr 758	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑0) / (!‘0)) = 1)
92	91	oveq2d 6565	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (0 + ((𝑤↑0) / (!‘0))) = (0 + 1))
93	92, 79	syl6eqr 2662	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (0 + ((𝑤↑0) / (!‘0))) = 1)
94	76, 79, 80, 54, 81, 89, 93	efsep 14679	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = (1 + Σ𝑘 ∈ (ℤ_≥‘1)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)))
95		exp1 12728	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ (𝑤 ∈ ℂ → (𝑤↑1) = 𝑤)
96	95	ad2antrr 758	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤↑1) = 𝑤)
97	96	oveq1d 6564	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑1) / (!‘1)) = (𝑤 / (!‘1)))
98		fac1 12926	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (!‘1) = 1
99	98	oveq2i 6560	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (𝑤 / (!‘1)) = (𝑤 / 1)
100	97, 99	syl6eq 2660	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑1) / (!‘1)) = (𝑤 / 1))
101		div1 10595	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (𝑤 ∈ ℂ → (𝑤 / 1) = 𝑤)
102	101	ad2antrr 758	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 / 1) = 𝑤)
103	100, 102	eqtrd 2644	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑1) / (!‘1)) = 𝑤)
104	103	oveq2d 6565	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (1 + ((𝑤↑1) / (!‘1))) = (1 + 𝑤))
105	76, 77, 78, 54, 57, 94, 104	efsep 14679	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = ((1 + 𝑤) + Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)))
106	105	eqcomd 2616	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((1 + 𝑤) + Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)) = (exp‘𝑤))
107		addcl 9897	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((1 ∈ ℂ ∧ 𝑤 ∈ ℂ) → (1 + 𝑤) ∈ ℂ)
108	9, 54, 107	sylancr 694	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (1 + 𝑤) ∈ ℂ)
109		2nn0 11186	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ 2 ∈ ℕ₀
110	76	eftlcl 14676	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((𝑤 ∈ ℂ ∧ 2 ∈ ℕ₀) → Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) ∈ ℂ)
111	54, 109, 110	sylancl 693	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) ∈ ℂ)
112	51, 108, 111	subaddd 10289	. . . . . . . . . . . . . . . . . . . . . . 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 246	. . . . . . . . . . . . . . . . . . . . . 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 2644	. . . . . . . . . . . . . . . . . . . . 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 2652	. . . . . . . . . . . . . . . . . . . 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 6107	. . . . . . . . . . . . . . . . . . 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 14041	. . . . . . . . . . . . . . . . . . 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 2646	. . . . . . . . . . . . . . . . . 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 2610	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑛 ∈ ℕ₀ ↦ (((abs‘𝑤)↑𝑛) / (!‘𝑛))) = (𝑛 ∈ ℕ₀ ↦ (((abs‘𝑤)↑𝑛) / (!‘𝑛)))
120		eqid 2610	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑛 ∈ ℕ₀ ↦ ((((abs‘𝑤)↑2) / (!‘2)) · ((1 / (2 + 1))↑𝑛))) = (𝑛 ∈ ℕ₀ ↦ ((((abs‘𝑤)↑2) / (!‘2)) · ((1 / (2 + 1))↑𝑛)))
121		2nn 11062	. . . . . . . . . . . . . . . . . . . 20 ⊢ 2 ∈ ℕ
122	121	a1i 11	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 2 ∈ ℕ)
123		1red 9934	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 1 ∈ ℝ)
124		simpr 476	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) < 1)
125	50, 123, 124	ltled 10064	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ≤ 1)
126	76, 119, 120, 122, 54, 125	eftlub 14678	. . . . . . . . . . . . . . . . . 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 4607	. . . . . . . . . . . . . . . . 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 10957	. . . . . . . . . . . . . . . . . . 19 ⊢ 3 = (2 + 1)
129		fac2 12928	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (!‘2) = 2
130	129	oveq1i 6559	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((!‘2) · 2) = (2 · 2)
131		2t2e4 11054	. . . . . . . . . . . . . . . . . . . 20 ⊢ (2 · 2) = 4
132	130, 131	eqtr2i 2633	. . . . . . . . . . . . . . . . . . 19 ⊢ 4 = ((!‘2) · 2)
133	128, 132	oveq12i 6561	. . . . . . . . . . . . . . . . . 18 ⊢ (3 / 4) = ((2 + 1) / ((!‘2) · 2))
134	133	oveq2i 6560	. . . . . . . . . . . . . . . . 17 ⊢ (((abs‘𝑤)↑2) · (3 / 4)) = (((abs‘𝑤)↑2) · ((2 + 1) / ((!‘2) · 2)))
135	127, 134	syl6breqr 4625	. . . . . . . . . . . . . . . 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 12898	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 0 ≤ ((abs‘𝑤)↑2))
138		1re 9918	. . . . . . . . . . . . . . . . . . . 20 ⊢ 1 ∈ ℝ
139		3lt4 11074	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ 3 < 4
140		4cn 10975	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ 4 ∈ ℂ
141	140	mulid1i 9921	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (4 · 1) = 4
142	139, 141	breqtrri 4610	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 3 < (4 · 1)
143		4re 10974	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ 4 ∈ ℝ
144		4pos 10993	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ 0 < 4
145	143, 144	pm3.2i 470	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (4 ∈ ℝ ∧ 0 < 4)
146		ltdivmul 10777	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((3 ∈ ℝ ∧ 1 ∈ ℝ ∧ (4 ∈ ℝ ∧ 0 < 4)) → ((3 / 4) < 1 ↔ 3 < (4 · 1)))
147	62, 138, 145, 146	mp3an 1416	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((3 / 4) < 1 ↔ 3 < (4 · 1))
148	142, 147	mpbir 220	. . . . . . . . . . . . . . . . . . . 20 ⊢ (3 / 4) < 1
149	65, 138, 148	ltleii 10039	. . . . . . . . . . . . . . . . . . 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 10843	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · (3 / 4)) ≤ (((abs‘𝑤)↑2) · 1))
152	50	recnd 9947	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ∈ ℂ)
153	152	sqcld 12868	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤)↑2) ∈ ℂ)
154	153	mulid1d 9936	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · 1) = ((abs‘𝑤)↑2))
155	151, 154	breqtrd 4609	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · (3 / 4)) ≤ ((abs‘𝑤)↑2))
156	60, 67, 61, 135, 155	letrd 10073	. . . . . . . . . . . . . . 15 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ ((abs‘𝑤)↑2))
157	152	sqvald 12867	. . . . . . . . . . . . . . 15 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤)↑2) = ((abs‘𝑤) · (abs‘𝑤)))
158	156, 157	breqtrd 4609	. . . . . . . . . . . . . 14 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ ((abs‘𝑤) · (abs‘𝑤)))
159		absgt0 13912	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑤 ∈ ℂ → (𝑤 ≠ 0 ↔ 0 < (abs‘𝑤)))
160	159	ad2antrr 758	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (𝑤 ≠ 0 ↔ 0 < (abs‘𝑤)))
161	55, 160	mpbid 221	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → 0 < (abs‘𝑤))
162	50, 161	elrpd 11745	. . . . . . . . . . . . . . 15 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ∈ ℝ⁺)
163	59, 50, 162	lemul2d 11792	. . . . . . . . . . . . . 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 246	. . . . . . . . . . . . 13 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 ≠ 0) ∧ (abs‘𝑤) < 1) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ≤ (abs‘𝑤))
165	164	ad2ant2l 778	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ≤ (abs‘𝑤))
166		simprl 790	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘𝑤) < 𝑥)
167	45, 46, 48, 165, 166	lelttrd 10074	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 ≠ 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) < 𝑥)
168	36, 167	eqbrtrd 4605	. . . . . . . . . 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 449	. . . . . . . . 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 229	. . . . . . . 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 482	. . . . . . 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 491	. . . . . 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 2949	. . . . 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 4587	. . . . . . . . 9 ⊢ (𝑦 = if(𝑥 ≤ 1, 𝑥, 1) → ((abs‘(𝑤 − 0)) < 𝑦 ↔ (abs‘(𝑤 − 0)) < if(𝑥 ≤ 1, 𝑥, 1)))
175	174	anbi2d 736	. . . . . . . 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 330	. . . . . . 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 2969	. . . . . 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 3282	. . . . 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 691	. . . 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 2906	. . 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 3694	. . . . . . . . . 10 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → 𝑧 ∈ ℂ)
182		efcl 14652	. . . . . . . . . 10 ⊢ (𝑧 ∈ ℂ → (exp‘𝑧) ∈ ℂ)
183	181, 182	syl 17	. . . . . . . . 9 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (exp‘𝑧) ∈ ℂ)
184		1cnd 9935	. . . . . . . . 9 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → 1 ∈ ℂ)
185	183, 184	subcld 10271	. . . . . . . 8 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → ((exp‘𝑧) − 1) ∈ ℂ)
186		eldifsni 4261	. . . . . . . 8 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → 𝑧 ≠ 0)
187	185, 181, 186	divcld 10680	. . . . . . 7 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (((exp‘𝑧) − 1) / 𝑧) ∈ ℂ)
188	31, 187	fmpti 6291	. . . . . 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 3700	. . . . 5 ⊢ (⊤ → (ℂ ∖ {0}) ⊆ ℂ)
191		0cnd 9912	. . . . 5 ⊢ (⊤ → 0 ∈ ℂ)
192	189, 190, 191	ellimc3 23449	. . . 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 1484	. . 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 957	. 2 ⊢ 1 ∈ ((𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0)
195	5	restid 15917	. . . . . 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 2619	. . . 4 ⊢ (TopOpen‘ℂ_fld) = ((TopOpen‘ℂ_fld) ↾_t ℂ)
198	181	subid1d 10260	. . . . . . 7 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (𝑧 − 0) = 𝑧)
199	198	oveq2d 6565	. . . . . 6 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (((exp‘𝑧) − (exp‘0)) / (𝑧 − 0)) = (((exp‘𝑧) − (exp‘0)) / 𝑧))
200		ef0 14660	. . . . . . . 8 ⊢ (exp‘0) = 1
201	200	oveq2i 6560	. . . . . . 7 ⊢ ((exp‘𝑧) − (exp‘0)) = ((exp‘𝑧) − 1)
202	201	oveq1i 6559	. . . . . 6 ⊢ (((exp‘𝑧) − (exp‘0)) / 𝑧) = (((exp‘𝑧) − 1) / 𝑧)
203	199, 202	syl6req 2661	. . . . 5 ⊢ (𝑧 ∈ (ℂ ∖ {0}) → (((exp‘𝑧) − 1) / 𝑧) = (((exp‘𝑧) − (exp‘0)) / (𝑧 − 0)))
204	203	mpteq2ia 4668	. . . 4 ⊢ (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − 1) / 𝑧)) = (𝑧 ∈ (ℂ ∖ {0}) ↦ (((exp‘𝑧) − (exp‘0)) / (𝑧 − 0)))
205		ssid 3587	. . . . 5 ⊢ ℂ ⊆ ℂ
206	205	a1i 11	. . . 4 ⊢ (⊤ → ℂ ⊆ ℂ)
207		eff 14651	. . . . 5 ⊢ exp:ℂ⟶ℂ
208	207	a1i 11	. . . 4 ⊢ (⊤ → exp:ℂ⟶ℂ)
209	197, 2, 204, 206, 208, 206	eldv 23468	. . 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 1484	. 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 957	1 ⊢ 0(ℂ D exp)1

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 195 ∧ wa 383 = wceq 1475 ⊤wtru 1476 ∈ wcel 1977 ≠ wne 2780 ∀wral 2896 ∃wrex 2897 ∖ cdif 3537 ⊆ wss 3540 ifcif 4036 {csn 4125 class class class wbr 4583 ↦ cmpt 4643 ⟶wf 5800 ‘cfv 5804 (class class class)co 6549 ℂcc 9813 ℝcr 9814 0cc0 9815 1c1 9816 + caddc 9818 · cmul 9820 < clt 9953 ≤ cle 9954 − cmin 10145 / cdiv 10563 ℕcn 10897 2c2 10947 3c3 10948 4c4 10949 ℕ₀cn0 11169 ℤ_≥cuz 11563 ℝ⁺crp 11708 ↑cexp 12722 !cfa 12922 abscabs 13822 Σcsu 14264 expce 14631 ↾_t crest 15904 TopOpenctopn 15905 ℂ_fldccnfld 19567 Topctop 20517 intcnt 20631 lim_ℂ climc 23432 D cdv 23433

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-fal 1481 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-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-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-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-ico 12052 df-fz 12198 df-fzo 12335 df-fl 12455 df-seq 12664 df-exp 12723 df-fac 12923 df-hash 12980 df-shft 13655 df-cj 13687 df-re 13688 df-im 13689 df-sqrt 13823 df-abs 13824 df-limsup 14050 df-clim 14067 df-rlim 14068 df-sum 14265 df-ef 14637 df-struct 15697 df-ndx 15698 df-slot 15699 df-base 15700 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-topgen 15927 df-psmet 19559 df-xmet 19560 df-met 19561 df-bl 19562 df-mopn 19563 df-cnfld 19568 df-top 20521 df-bases 20522 df-topon 20523 df-topsp 20524 df-ntr 20634 df-cnp 20842 df-xms 21935 df-ms 21936 df-limc 23436 df-dv 23437

This theorem is referenced by: dvef 23547

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