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Theorem dveflem 14872

Description: Derivative of the exponential function at 0. The key step in the proof is eftlub 11833, 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 𝑢 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		0cn 8011	. . 3 ⊢ 0 ∈ ℂ
2		eqid 2193	. . . . 5 ⊢ (MetOpen‘(abs ∘ − )) = (MetOpen‘(abs ∘ − ))
3	2	cntoptop 14701	. . . 4 ⊢ (MetOpen‘(abs ∘ − )) ∈ Top
4		unicntopcntop 14704	. . . . 5 ⊢ ℂ = ∪ (MetOpen‘(abs ∘ − ))
5	4	ntrtop 14296	. . . 4 ⊢ ((MetOpen‘(abs ∘ − )) ∈ Top → ((int‘(MetOpen‘(abs ∘ − )))‘ℂ) = ℂ)
6	3, 5	ax-mp 5	. . 3 ⊢ ((int‘(MetOpen‘(abs ∘ − )))‘ℂ) = ℂ
7	1, 6	eleqtrri 2269	. 2 ⊢ 0 ∈ ((int‘(MetOpen‘(abs ∘ − )))‘ℂ)
8		ax-1cn 7965	. . 3 ⊢ 1 ∈ ℂ
9		1rp 9723	. . . . . 6 ⊢ 1 ∈ ℝ⁺
10		rpmincl 11381	. . . . . 6 ⊢ ((𝑥 ∈ ℝ⁺ ∧ 1 ∈ ℝ⁺) → inf({𝑥, 1}, ℝ, < ) ∈ ℝ⁺)
11	9, 10	mpan2 425	. . . . 5 ⊢ (𝑥 ∈ ℝ⁺ → inf({𝑥, 1}, ℝ, < ) ∈ ℝ⁺)
12		breq1 4032	. . . . . . . 8 ⊢ (𝑢 = 𝑤 → (𝑢 # 0 ↔ 𝑤 # 0))
13	12	elrab 2916	. . . . . . 7 ⊢ (𝑤 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↔ (𝑤 ∈ ℂ ∧ 𝑤 # 0))
14		simprl 529	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → 𝑤 ∈ ℂ)
15	14	subid1d 8319	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → (𝑤 − 0) = 𝑤)
16	15	fveq2d 5558	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → (abs‘(𝑤 − 0)) = (abs‘𝑤))
17	16	breq1d 4039	. . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → ((abs‘(𝑤 − 0)) < inf({𝑥, 1}, ℝ, < ) ↔ (abs‘𝑤) < inf({𝑥, 1}, ℝ, < )))
18	14	abscld 11325	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → (abs‘𝑤) ∈ ℝ)
19		rpre 9726	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ ℝ⁺ → 𝑥 ∈ ℝ)
20	19	adantr 276	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → 𝑥 ∈ ℝ)
21		1red 8034	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → 1 ∈ ℝ)
22		ltmininf 11378	. . . . . . . . . . 11 ⊢ (((abs‘𝑤) ∈ ℝ ∧ 𝑥 ∈ ℝ ∧ 1 ∈ ℝ) → ((abs‘𝑤) < inf({𝑥, 1}, ℝ, < ) ↔ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)))
23	18, 20, 21, 22	syl3anc 1249	. . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → ((abs‘𝑤) < inf({𝑥, 1}, ℝ, < ) ↔ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)))
24	17, 23	bitrd 188	. . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → ((abs‘(𝑤 − 0)) < inf({𝑥, 1}, ℝ, < ) ↔ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)))
25		eqid 2193	. . . . . . . . . . . . 13 ⊢ (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧)) = (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))
26		fveq2 5554	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = 𝑤 → (exp‘𝑧) = (exp‘𝑤))
27	26	oveq1d 5933	. . . . . . . . . . . . . 14 ⊢ (𝑧 = 𝑤 → ((exp‘𝑧) − 1) = ((exp‘𝑤) − 1))
28		id 19	. . . . . . . . . . . . . 14 ⊢ (𝑧 = 𝑤 → 𝑧 = 𝑤)
29	27, 28	oveq12d 5936	. . . . . . . . . . . . 13 ⊢ (𝑧 = 𝑤 → (((exp‘𝑧) − 1) / 𝑧) = (((exp‘𝑤) − 1) / 𝑤))
30		simplr 528	. . . . . . . . . . . . . 14 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (𝑤 ∈ ℂ ∧ 𝑤 # 0))
31	30, 13	sylibr 134	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑤 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0})
32		efcl 11807	. . . . . . . . . . . . . . . 16 ⊢ (𝑤 ∈ ℂ → (exp‘𝑤) ∈ ℂ)
33		peano2cnm 8285	. . . . . . . . . . . . . . . 16 ⊢ ((exp‘𝑤) ∈ ℂ → ((exp‘𝑤) − 1) ∈ ℂ)
34	14, 32, 33	3syl 17	. . . . . . . . . . . . . . 15 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → ((exp‘𝑤) − 1) ∈ ℂ)
35		simprr 531	. . . . . . . . . . . . . . 15 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → 𝑤 # 0)
36	34, 14, 35	divclapd 8809	. . . . . . . . . . . . . 14 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → (((exp‘𝑤) − 1) / 𝑤) ∈ ℂ)
37	36	adantr 276	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (((exp‘𝑤) − 1) / 𝑤) ∈ ℂ)
38	25, 29, 31, 37	fvmptd3 5651	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → ((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) = (((exp‘𝑤) − 1) / 𝑤))
39	38	fvoveq1d 5940	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘(((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) = (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)))
40		1cnd 8035	. . . . . . . . . . . . . 14 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 1 ∈ ℂ)
41	37, 40	subcld 8330	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → ((((exp‘𝑤) − 1) / 𝑤) − 1) ∈ ℂ)
42	41	abscld 11325	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ∈ ℝ)
43		simplrl 535	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑤 ∈ ℂ)
44	43	abscld 11325	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘𝑤) ∈ ℝ)
45		simpll 527	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑥 ∈ ℝ⁺)
46	45	rpred 9762	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → 𝑥 ∈ ℝ)
47		abscl 11195	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑤 ∈ ℂ → (abs‘𝑤) ∈ ℝ)
48	47	ad2antrr 488	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ∈ ℝ)
49	32	ad2antrr 488	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) ∈ ℂ)
50		subcl 8218	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((exp‘𝑤) ∈ ℂ ∧ 1 ∈ ℂ) → ((exp‘𝑤) − 1) ∈ ℂ)
51	49, 8, 50	sylancl 413	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((exp‘𝑤) − 1) ∈ ℂ)
52		simpll 527	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → 𝑤 ∈ ℂ)
53		simplr 528	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → 𝑤 # 0)
54	51, 52, 53	divclapd 8809	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) / 𝑤) ∈ ℂ)
55		1cnd 8035	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → 1 ∈ ℂ)
56	54, 55	subcld 8330	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) / 𝑤) − 1) ∈ ℂ)
57	56	abscld 11325	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ∈ ℝ)
58	48, 57	remulcld 8050	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ∈ ℝ)
59	48	resqcld 10770	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤)↑2) ∈ ℝ)
60		3re 9056	. . . . . . . . . . . . . . . . . 18 ⊢ 3 ∈ ℝ
61		4nn 9145	. . . . . . . . . . . . . . . . . 18 ⊢ 4 ∈ ℕ
62		nndivre 9018	. . . . . . . . . . . . . . . . . 18 ⊢ ((3 ∈ ℝ ∧ 4 ∈ ℕ) → (3 / 4) ∈ ℝ)
63	60, 61, 62	mp2an 426	. . . . . . . . . . . . . . . . 17 ⊢ (3 / 4) ∈ ℝ
64		remulcl 8000	. . . . . . . . . . . . . . . . 17 ⊢ ((((abs‘𝑤)↑2) ∈ ℝ ∧ (3 / 4) ∈ ℝ) → (((abs‘𝑤)↑2) · (3 / 4)) ∈ ℝ)
65	59, 63, 64	sylancl 413	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · (3 / 4)) ∈ ℝ)
66	51, 52	subcld 8330	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) − 𝑤) ∈ ℂ)
67	66, 52, 53	divcanap2d 8811	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (𝑤 · ((((exp‘𝑤) − 1) − 𝑤) / 𝑤)) = (((exp‘𝑤) − 1) − 𝑤))
68	51, 52, 52, 53	divsubdirapd 8849	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) − 𝑤) / 𝑤) = ((((exp‘𝑤) − 1) / 𝑤) − (𝑤 / 𝑤)))
69	52, 53	dividapd 8805	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (𝑤 / 𝑤) = 1)
70	69	oveq2d 5934	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) / 𝑤) − (𝑤 / 𝑤)) = ((((exp‘𝑤) − 1) / 𝑤) − 1))
71	68, 70	eqtrd 2226	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((((exp‘𝑤) − 1) − 𝑤) / 𝑤) = ((((exp‘𝑤) − 1) / 𝑤) − 1))
72	71	oveq2d 5934	. . . . . . . . . . . . . . . . . . . . 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 8361	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (((exp‘𝑤) − 1) − 𝑤) = ((exp‘𝑤) − (1 + 𝑤)))
74		addcl 7997	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((1 ∈ ℂ ∧ 𝑤 ∈ ℂ) → (1 + 𝑤) ∈ ℂ)
75	8, 52, 74	sylancr 414	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (1 + 𝑤) ∈ ℂ)
76		2nn0 9257	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ 2 ∈ ℕ₀
77		eqid 2193	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛))) = (𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))
78	77	eftlcl 11831	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝑤 ∈ ℂ ∧ 2 ∈ ℕ₀) → Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) ∈ ℂ)
79	52, 76, 78	sylancl 413	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → Σ𝑘 ∈ (ℤ_≥‘2)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) ∈ ℂ)
80		df-2 9041	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ 2 = (1 + 1)
81		1nn0 9256	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ 1 ∈ ℕ₀
82		1e0p1 9489	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ 1 = (0 + 1)
83		0nn0 9255	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ 0 ∈ ℕ₀
84		0cnd 8012	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → 0 ∈ ℂ)
85	77	efval2 11808	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (𝑤 ∈ ℂ → (exp‘𝑤) = Σ𝑘 ∈ ℕ₀ ((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
86	85	ad2antrr 488	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = Σ𝑘 ∈ ℕ₀ ((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘))
87		nn0uz 9627	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ ℕ₀ = (ℤ_≥‘0)
88	87	sumeq1i 11506	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ Σ𝑘 ∈ ℕ₀ ((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) = Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)
89	86, 88	eqtr2di 2243	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘) = (exp‘𝑤))
90	89	oveq2d 5934	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (0 + Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)) = (0 + (exp‘𝑤)))
91	49	addlidd 8169	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (0 + (exp‘𝑤)) = (exp‘𝑤))
92	90, 91	eqtr2d 2227	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = (0 + Σ𝑘 ∈ (ℤ_≥‘0)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)))
93		eft0val 11836	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (𝑤 ∈ ℂ → ((𝑤↑0) / (!‘0)) = 1)
94	93	ad2antrr 488	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑0) / (!‘0)) = 1)
95	94	oveq2d 5934	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (0 + ((𝑤↑0) / (!‘0))) = (0 + 1))
96	95, 82	eqtr4di 2244	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (0 + ((𝑤↑0) / (!‘0))) = 1)
97	77, 82, 83, 52, 84, 92, 96	efsep 11834	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (exp‘𝑤) = (1 + Σ𝑘 ∈ (ℤ_≥‘1)((𝑛 ∈ ℕ₀ ↦ ((𝑤↑𝑛) / (!‘𝑛)))‘𝑘)))
98		exp1 10616	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (𝑤 ∈ ℂ → (𝑤↑1) = 𝑤)
99	98	ad2antrr 488	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (𝑤↑1) = 𝑤)
100	99	oveq1d 5933	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑1) / (!‘1)) = (𝑤 / (!‘1)))
101		fac1 10800	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (!‘1) = 1
102	101	oveq2i 5929	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (𝑤 / (!‘1)) = (𝑤 / 1)
103	100, 102	eqtrdi 2242	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑1) / (!‘1)) = (𝑤 / 1))
104		div1 8722	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (𝑤 ∈ ℂ → (𝑤 / 1) = 𝑤)
105	104	ad2antrr 488	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (𝑤 / 1) = 𝑤)
106	103, 105	eqtrd 2226	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((𝑤↑1) / (!‘1)) = 𝑤)
107	106	oveq2d 5934	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (1 + ((𝑤↑1) / (!‘1))) = (1 + 𝑤))
108	77, 80, 81, 52, 55, 97, 107	efsep 11834	. . . . . . . . . . . . . . . . . . . . . . 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 8386	. . . . . . . . . . . . . . . . . . . . . 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 2226	. . . . . . . . . . . . . . . . . . . . 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 2234	. . . . . . . . . . . . . . . . . . . 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 5558	. . . . . . . . . . . . . . . . . . 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 11338	. . . . . . . . . . . . . . . . . . 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 2228	. . . . . . . . . . . . . . . . . 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 2193	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑛 ∈ ℕ₀ ↦ (((abs‘𝑤)↑𝑛) / (!‘𝑛))) = (𝑛 ∈ ℕ₀ ↦ (((abs‘𝑤)↑𝑛) / (!‘𝑛)))
116		eqid 2193	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑛 ∈ ℕ₀ ↦ ((((abs‘𝑤)↑2) / (!‘2)) · ((1 / (2 + 1))↑𝑛))) = (𝑛 ∈ ℕ₀ ↦ ((((abs‘𝑤)↑2) / (!‘2)) · ((1 / (2 + 1))↑𝑛)))
117		2nn 9143	. . . . . . . . . . . . . . . . . . . 20 ⊢ 2 ∈ ℕ
118	117	a1i 9	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → 2 ∈ ℕ)
119		1red 8034	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → 1 ∈ ℝ)
120		simpr 110	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) < 1)
121	48, 119, 120	ltled 8138	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ≤ 1)
122	77, 115, 116, 118, 52, 121	eftlub 11833	. . . . . . . . . . . . . . . . . 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 4053	. . . . . . . . . . . . . . . . 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 9042	. . . . . . . . . . . . . . . . . . 19 ⊢ 3 = (2 + 1)
125		fac2 10802	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (!‘2) = 2
126	125	oveq1i 5928	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((!‘2) · 2) = (2 · 2)
127		2t2e4 9136	. . . . . . . . . . . . . . . . . . . 20 ⊢ (2 · 2) = 4
128	126, 127	eqtr2i 2215	. . . . . . . . . . . . . . . . . . 19 ⊢ 4 = ((!‘2) · 2)
129	124, 128	oveq12i 5930	. . . . . . . . . . . . . . . . . 18 ⊢ (3 / 4) = ((2 + 1) / ((!‘2) · 2))
130	129	oveq2i 5929	. . . . . . . . . . . . . . . . 17 ⊢ (((abs‘𝑤)↑2) · (3 / 4)) = (((abs‘𝑤)↑2) · ((2 + 1) / ((!‘2) · 2)))
131	123, 130	breqtrrdi 4071	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ (((abs‘𝑤)↑2) · (3 / 4)))
132	63	a1i 9	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (3 / 4) ∈ ℝ)
133	48	sqge0d 10771	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → 0 ≤ ((abs‘𝑤)↑2))
134		1re 8018	. . . . . . . . . . . . . . . . . . . 20 ⊢ 1 ∈ ℝ
135		3lt4 9154	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ 3 < 4
136		4cn 9060	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ 4 ∈ ℂ
137	136	mulid1i 8021	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (4 · 1) = 4
138	135, 137	breqtrri 4056	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 3 < (4 · 1)
139		4re 9059	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ 4 ∈ ℝ
140		4pos 9079	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ 0 < 4
141	139, 140	pm3.2i 272	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (4 ∈ ℝ ∧ 0 < 4)
142		ltdivmul 8895	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((3 ∈ ℝ ∧ 1 ∈ ℝ ∧ (4 ∈ ℝ ∧ 0 < 4)) → ((3 / 4) < 1 ↔ 3 < (4 · 1)))
143	60, 134, 141, 142	mp3an 1348	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((3 / 4) < 1 ↔ 3 < (4 · 1))
144	138, 143	mpbir 146	. . . . . . . . . . . . . . . . . . . 20 ⊢ (3 / 4) < 1
145	63, 134, 144	ltleii 8122	. . . . . . . . . . . . . . . . . . 19 ⊢ (3 / 4) ≤ 1
146	145	a1i 9	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (3 / 4) ≤ 1)
147	132, 119, 59, 133, 146	lemul2ad 8959	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · (3 / 4)) ≤ (((abs‘𝑤)↑2) · 1))
148	48	recnd 8048	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ∈ ℂ)
149	148	sqcld 10742	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤)↑2) ∈ ℂ)
150	149	mulridd 8036	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · 1) = ((abs‘𝑤)↑2))
151	147, 150	breqtrd 4055	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (((abs‘𝑤)↑2) · (3 / 4)) ≤ ((abs‘𝑤)↑2))
152	58, 65, 59, 131, 151	letrd 8143	. . . . . . . . . . . . . . 15 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ ((abs‘𝑤)↑2))
153	148	sqvald 10741	. . . . . . . . . . . . . . 15 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤)↑2) = ((abs‘𝑤) · (abs‘𝑤)))
154	152, 153	breqtrd 4055	. . . . . . . . . . . . . 14 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → ((abs‘𝑤) · (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1))) ≤ ((abs‘𝑤) · (abs‘𝑤)))
155		absgt0ap 11243	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑤 ∈ ℂ → (𝑤 # 0 ↔ 0 < (abs‘𝑤)))
156	155	ad2antrr 488	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (𝑤 # 0 ↔ 0 < (abs‘𝑤)))
157	53, 156	mpbid 147	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → 0 < (abs‘𝑤))
158	48, 157	elrpd 9759	. . . . . . . . . . . . . . 15 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (abs‘𝑤) ∈ ℝ⁺)
159	57, 48, 158	lemul2d 9807	. . . . . . . . . . . . . 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 167	. . . . . . . . . . . . 13 ⊢ (((𝑤 ∈ ℂ ∧ 𝑤 # 0) ∧ (abs‘𝑤) < 1) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ≤ (abs‘𝑤))
161	160	ad2ant2l 508	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) ≤ (abs‘𝑤))
162		simprl 529	. . . . . . . . . . . 12 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘𝑤) < 𝑥)
163	42, 44, 46, 161, 162	lelttrd 8144	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘((((exp‘𝑤) − 1) / 𝑤) − 1)) < 𝑥)
164	39, 163	eqbrtrd 4051	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) ∧ ((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1)) → (abs‘(((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥)
165	164	ex 115	. . . . . . . . 9 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → (((abs‘𝑤) < 𝑥 ∧ (abs‘𝑤) < 1) → (abs‘(((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
166	24, 165	sylbid 150	. . . . . . . 8 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → ((abs‘(𝑤 − 0)) < inf({𝑥, 1}, ℝ, < ) → (abs‘(((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
167	166	adantld 278	. . . . . . 7 ⊢ ((𝑥 ∈ ℝ⁺ ∧ (𝑤 ∈ ℂ ∧ 𝑤 # 0)) → ((𝑤 # 0 ∧ (abs‘(𝑤 − 0)) < inf({𝑥, 1}, ℝ, < )) → (abs‘(((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
168	13, 167	sylan2b 287	. . . . . 6 ⊢ ((𝑥 ∈ ℝ⁺ ∧ 𝑤 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0}) → ((𝑤 # 0 ∧ (abs‘(𝑤 − 0)) < inf({𝑥, 1}, ℝ, < )) → (abs‘(((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
169	168	ralrimiva 2567	. . . . 5 ⊢ (𝑥 ∈ ℝ⁺ → ∀𝑤 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ((𝑤 # 0 ∧ (abs‘(𝑤 − 0)) < inf({𝑥, 1}, ℝ, < )) → (abs‘(((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
170		brimralrspcev 4088	. . . . 5 ⊢ ((inf({𝑥, 1}, ℝ, < ) ∈ ℝ⁺ ∧ ∀𝑤 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ((𝑤 # 0 ∧ (abs‘(𝑤 − 0)) < inf({𝑥, 1}, ℝ, < )) → (abs‘(((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥)) → ∃𝑦 ∈ ℝ⁺ ∀𝑤 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ((𝑤 # 0 ∧ (abs‘(𝑤 − 0)) < 𝑦) → (abs‘(((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
171	11, 169, 170	syl2anc 411	. . . 4 ⊢ (𝑥 ∈ ℝ⁺ → ∃𝑦 ∈ ℝ⁺ ∀𝑤 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ((𝑤 # 0 ∧ (abs‘(𝑤 − 0)) < 𝑦) → (abs‘(((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))
172	171	rgen 2547	. . 3 ⊢ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ ℝ⁺ ∀𝑤 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ((𝑤 # 0 ∧ (abs‘(𝑤 − 0)) < 𝑦) → (abs‘(((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥)
173		elrabi 2913	. . . . . . . . . 10 ⊢ (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} → 𝑧 ∈ ℂ)
174		efcl 11807	. . . . . . . . . 10 ⊢ (𝑧 ∈ ℂ → (exp‘𝑧) ∈ ℂ)
175	173, 174	syl 14	. . . . . . . . 9 ⊢ (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} → (exp‘𝑧) ∈ ℂ)
176		1cnd 8035	. . . . . . . . 9 ⊢ (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} → 1 ∈ ℂ)
177	175, 176	subcld 8330	. . . . . . . 8 ⊢ (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} → ((exp‘𝑧) − 1) ∈ ℂ)
178		breq1 4032	. . . . . . . . . 10 ⊢ (𝑢 = 𝑧 → (𝑢 # 0 ↔ 𝑧 # 0))
179	178	elrab 2916	. . . . . . . . 9 ⊢ (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↔ (𝑧 ∈ ℂ ∧ 𝑧 # 0))
180	179	simprbi 275	. . . . . . . 8 ⊢ (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} → 𝑧 # 0)
181	177, 173, 180	divclapd 8809	. . . . . . 7 ⊢ (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} → (((exp‘𝑧) − 1) / 𝑧) ∈ ℂ)
182	25, 181	fmpti 5710	. . . . . 6 ⊢ (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧)):{𝑢 ∈ ℂ ∣ 𝑢 # 0}⟶ℂ
183	182	a1i 9	. . . . 5 ⊢ (⊤ → (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧)):{𝑢 ∈ ℂ ∣ 𝑢 # 0}⟶ℂ)
184		apsscn 8666	. . . . . 6 ⊢ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ⊆ ℂ
185	184	a1i 9	. . . . 5 ⊢ (⊤ → {𝑢 ∈ ℂ ∣ 𝑢 # 0} ⊆ ℂ)
186		0cnd 8012	. . . . 5 ⊢ (⊤ → 0 ∈ ℂ)
187	183, 185, 186	ellimc3ap 14815	. . . 4 ⊢ (⊤ → (1 ∈ ((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0) ↔ (1 ∈ ℂ ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ ℝ⁺ ∀𝑤 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ((𝑤 # 0 ∧ (abs‘(𝑤 − 0)) < 𝑦) → (abs‘(((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥))))
188	187	mptru 1373	. . 3 ⊢ (1 ∈ ((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0) ↔ (1 ∈ ℂ ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑦 ∈ ℝ⁺ ∀𝑤 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ((𝑤 # 0 ∧ (abs‘(𝑤 − 0)) < 𝑦) → (abs‘(((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧))‘𝑤) − 1)) < 𝑥)))
189	8, 172, 188	mpbir2an 944	. 2 ⊢ 1 ∈ ((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0)
190	2	cntoptopon 14700	. . . . 5 ⊢ (MetOpen‘(abs ∘ − )) ∈ (TopOn‘ℂ)
191	190	toponrestid 14189	. . . 4 ⊢ (MetOpen‘(abs ∘ − )) = ((MetOpen‘(abs ∘ − )) ↾_t ℂ)
192	173	subid1d 8319	. . . . . . 7 ⊢ (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} → (𝑧 − 0) = 𝑧)
193	192	oveq2d 5934	. . . . . 6 ⊢ (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} → (((exp‘𝑧) − (exp‘0)) / (𝑧 − 0)) = (((exp‘𝑧) − (exp‘0)) / 𝑧))
194		ef0 11815	. . . . . . . 8 ⊢ (exp‘0) = 1
195	194	oveq2i 5929	. . . . . . 7 ⊢ ((exp‘𝑧) − (exp‘0)) = ((exp‘𝑧) − 1)
196	195	oveq1i 5928	. . . . . 6 ⊢ (((exp‘𝑧) − (exp‘0)) / 𝑧) = (((exp‘𝑧) − 1) / 𝑧)
197	193, 196	eqtr2di 2243	. . . . 5 ⊢ (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} → (((exp‘𝑧) − 1) / 𝑧) = (((exp‘𝑧) − (exp‘0)) / (𝑧 − 0)))
198	197	mpteq2ia 4115	. . . 4 ⊢ (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧)) = (𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − (exp‘0)) / (𝑧 − 0)))
199		ssidd 3200	. . . 4 ⊢ (⊤ → ℂ ⊆ ℂ)
200		eff 11806	. . . . 5 ⊢ exp:ℂ⟶ℂ
201	200	a1i 9	. . . 4 ⊢ (⊤ → exp:ℂ⟶ℂ)
202	191, 2, 198, 199, 201, 199	eldvap 14836	. . 3 ⊢ (⊤ → (0(ℂ D exp)1 ↔ (0 ∈ ((int‘(MetOpen‘(abs ∘ − )))‘ℂ) ∧ 1 ∈ ((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0))))
203	202	mptru 1373	. 2 ⊢ (0(ℂ D exp)1 ↔ (0 ∈ ((int‘(MetOpen‘(abs ∘ − )))‘ℂ) ∧ 1 ∈ ((𝑧 ∈ {𝑢 ∈ ℂ ∣ 𝑢 # 0} ↦ (((exp‘𝑧) − 1) / 𝑧)) lim_ℂ 0)))
204	7, 189, 203	mpbir2an 944	1 ⊢ 0(ℂ D exp)1

Colors of variables: wff set class

Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1364 ⊤wtru 1365 ∈ wcel 2164 ∀wral 2472 ∃wrex 2473 {crab 2476 ⊆ wss 3153 {cpr 3619 class class class wbr 4029 ↦ cmpt 4090 ∘ ccom 4663 ⟶wf 5250 ‘cfv 5254 (class class class)co 5918 infcinf 7042 ℂcc 7870 ℝcr 7871 0cc0 7872 1c1 7873 + caddc 7875 · cmul 7877 < clt 8054 ≤ cle 8055 − cmin 8190 # cap 8600 / cdiv 8691 ℕcn 8982 2c2 9033 3c3 9034 4c4 9035 ℕ₀cn0 9240 ℤ_≥cuz 9592 ℝ⁺crp 9719 ↑cexp 10609 !cfa 10796 abscabs 11141 Σcsu 11496 expce 11785 MetOpencmopn 14037 Topctop 14165 intcnt 14261 lim_ℂ climc 14808 D cdv 14809

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2166 ax-14 2167 ax-ext 2175 ax-coll 4144 ax-sep 4147 ax-nul 4155 ax-pow 4203 ax-pr 4238 ax-un 4464 ax-setind 4569 ax-iinf 4620 ax-cnex 7963 ax-resscn 7964 ax-1cn 7965 ax-1re 7966 ax-icn 7967 ax-addcl 7968 ax-addrcl 7969 ax-mulcl 7970 ax-mulrcl 7971 ax-addcom 7972 ax-mulcom 7973 ax-addass 7974 ax-mulass 7975 ax-distr 7976 ax-i2m1 7977 ax-0lt1 7978 ax-1rid 7979 ax-0id 7980 ax-rnegex 7981 ax-precex 7982 ax-cnre 7983 ax-pre-ltirr 7984 ax-pre-ltwlin 7985 ax-pre-lttrn 7986 ax-pre-apti 7987 ax-pre-ltadd 7988 ax-pre-mulgt0 7989 ax-pre-mulext 7990 ax-arch 7991 ax-caucvg 7992

This theorem depends on definitions: df-bi 117 df-stab 832 df-dc 836 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-eu 2045 df-mo 2046 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-ne 2365 df-nel 2460 df-ral 2477 df-rex 2478 df-reu 2479 df-rmo 2480 df-rab 2481 df-v 2762 df-sbc 2986 df-csb 3081 df-dif 3155 df-un 3157 df-in 3159 df-ss 3166 df-nul 3447 df-if 3558 df-pw 3603 df-sn 3624 df-pr 3625 df-op 3627 df-uni 3836 df-int 3871 df-iun 3914 df-br 4030 df-opab 4091 df-mpt 4092 df-tr 4128 df-id 4324 df-po 4327 df-iso 4328 df-iord 4397 df-on 4399 df-ilim 4400 df-suc 4402 df-iom 4623 df-xp 4665 df-rel 4666 df-cnv 4667 df-co 4668 df-dm 4669 df-rn 4670 df-res 4671 df-ima 4672 df-iota 5215 df-fun 5256 df-fn 5257 df-f 5258 df-f1 5259 df-fo 5260 df-f1o 5261 df-fv 5262 df-isom 5263 df-riota 5873 df-ov 5921 df-oprab 5922 df-mpo 5923 df-1st 6193 df-2nd 6194 df-recs 6358 df-irdg 6423 df-frec 6444 df-1o 6469 df-oadd 6473 df-er 6587 df-map 6704 df-pm 6705 df-en 6795 df-dom 6796 df-fin 6797 df-sup 7043 df-inf 7044 df-pnf 8056 df-mnf 8057 df-xr 8058 df-ltxr 8059 df-le 8060 df-sub 8192 df-neg 8193 df-reap 8594 df-ap 8601 df-div 8692 df-inn 8983 df-2 9041 df-3 9042 df-4 9043 df-n0 9241 df-z 9318 df-uz 9593 df-q 9685 df-rp 9720 df-xneg 9838 df-xadd 9839 df-ico 9960 df-fz 10075 df-fzo 10209 df-seqfrec 10519 df-exp 10610 df-fac 10797 df-ihash 10847 df-shft 10959 df-cj 10986 df-re 10987 df-im 10988 df-rsqrt 11142 df-abs 11143 df-clim 11422 df-sumdc 11497 df-ef 11791 df-rest 12852 df-topgen 12871 df-psmet 14039 df-xmet 14040 df-met 14041 df-bl 14042 df-mopn 14043 df-top 14166 df-topon 14179 df-bases 14211 df-ntr 14264 df-limced 14810 df-dvap 14811

This theorem is referenced by: dvef 14873

W3C validator