Theorem rlimdiv 14376

Description: Limit of the quotient of two converging functions. Proposition 12-2.1(a) of [Gleason] p. 168. (Contributed by Mario Carneiro, 22-Sep-2014.)

Hypotheses

Ref	Expression
rlimadd.3	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ 𝑉)
rlimadd.4	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ∈ 𝑉)
rlimadd.5	⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) ⇝𝑟 𝐷)
rlimadd.6	⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐶) ⇝𝑟 𝐸)
rlimdiv.7	⊢ (𝜑 → 𝐸 ≠ 0)
rlimdiv.8	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ≠ 0)

Assertion

Ref	Expression
rlimdiv	⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐵 / 𝐶)) ⇝𝑟 (𝐷 / 𝐸))

Distinct variable groups:   𝑥,𝐴   𝑥,𝐷   𝜑,𝑥   𝑥,𝐸

Allowed substitution hints:   𝐵(𝑥)   𝐶(𝑥)   𝑉(𝑥)

Proof of Theorem rlimdiv

Dummy variables 𝑤 𝑣 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		rlimadd.3	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ 𝑉)
2		rlimadd.5	. . . 4 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) ⇝𝑟 𝐷)
3	1, 2	rlimmptrcl 14338	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ)
4		rlimadd.4	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ∈ 𝑉)
5		rlimadd.6	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐶) ⇝𝑟 𝐸)
6	4, 5	rlimmptrcl 14338	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ∈ ℂ)
7		rlimdiv.8	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ≠ 0)
8	6, 7	reccld 10794	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (1 / 𝐶) ∈ ℂ)
9		eldifsn 4317	. . . . . . 7 ⊢ (𝐶 ∈ (ℂ ∖ {0}) ↔ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0))
10	6, 7, 9	sylanbrc 698	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ∈ (ℂ ∖ {0}))
11		eqid 2622	. . . . . 6 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐶) = (𝑥 ∈ 𝐴 ↦ 𝐶)
12	10, 11	fmptd 6385	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐶):𝐴⟶(ℂ ∖ {0}))
13		rlimcl 14234	. . . . . . 7 ⊢ ((𝑥 ∈ 𝐴 ↦ 𝐶) ⇝𝑟 𝐸 → 𝐸 ∈ ℂ)
14	5, 13	syl 17	. . . . . 6 ⊢ (𝜑 → 𝐸 ∈ ℂ)
15		rlimdiv.7	. . . . . 6 ⊢ (𝜑 → 𝐸 ≠ 0)
16		eldifsn 4317	. . . . . 6 ⊢ (𝐸 ∈ (ℂ ∖ {0}) ↔ (𝐸 ∈ ℂ ∧ 𝐸 ≠ 0))
17	14, 15, 16	sylanbrc 698	. . . . 5 ⊢ (𝜑 → 𝐸 ∈ (ℂ ∖ {0}))
18		eldifsn 4317	. . . . . . . 8 ⊢ (𝑦 ∈ (ℂ ∖ {0}) ↔ (𝑦 ∈ ℂ ∧ 𝑦 ≠ 0))
19		reccl 10692	. . . . . . . 8 ⊢ ((𝑦 ∈ ℂ ∧ 𝑦 ≠ 0) → (1 / 𝑦) ∈ ℂ)
20	18, 19	sylbi 207	. . . . . . 7 ⊢ (𝑦 ∈ (ℂ ∖ {0}) → (1 / 𝑦) ∈ ℂ)
21	20	adantl 482	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ (ℂ ∖ {0})) → (1 / 𝑦) ∈ ℂ)
22		eqid 2622	. . . . . 6 ⊢ (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) = (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))
23	21, 22	fmptd 6385	. . . . 5 ⊢ (𝜑 → (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)):(ℂ ∖ {0})⟶ℂ)
24		eqid 2622	. . . . . . . 8 ⊢ (if(1 ≤ ((abs‘𝐸) · 𝑧), 1, ((abs‘𝐸) · 𝑧)) · ((abs‘𝐸) / 2)) = (if(1 ≤ ((abs‘𝐸) · 𝑧), 1, ((abs‘𝐸) · 𝑧)) · ((abs‘𝐸) / 2))
25	24	reccn2 14327	. . . . . . 7 ⊢ ((𝐸 ∈ (ℂ ∖ {0}) ∧ 𝑧 ∈ ℝ+) → ∃𝑤 ∈ ℝ+ ∀𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣 − 𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧))
26	17, 25	sylan 488	. . . . . 6 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ+) → ∃𝑤 ∈ ℝ+ ∀𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣 − 𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧))
27		oveq2 6658	. . . . . . . . . . . . . 14 ⊢ (𝑦 = 𝑣 → (1 / 𝑦) = (1 / 𝑣))
28		ovex 6678	. . . . . . . . . . . . . 14 ⊢ (1 / 𝑣) ∈ V
29	27, 22, 28	fvmpt 6282	. . . . . . . . . . . . 13 ⊢ (𝑣 ∈ (ℂ ∖ {0}) → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) = (1 / 𝑣))
30		oveq2 6658	. . . . . . . . . . . . . . 15 ⊢ (𝑦 = 𝐸 → (1 / 𝑦) = (1 / 𝐸))
31		ovex 6678	. . . . . . . . . . . . . . 15 ⊢ (1 / 𝐸) ∈ V
32	30, 22, 31	fvmpt 6282	. . . . . . . . . . . . . 14 ⊢ (𝐸 ∈ (ℂ ∖ {0}) → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸) = (1 / 𝐸))
33	17, 32	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸) = (1 / 𝐸))
34	29, 33	oveqan12rd 6670	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑣 ∈ (ℂ ∖ {0})) → (((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸)) = ((1 / 𝑣) − (1 / 𝐸)))
35	34	fveq2d 6195	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑣 ∈ (ℂ ∖ {0})) → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) = (abs‘((1 / 𝑣) − (1 / 𝐸))))
36	35	breq1d 4663	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑣 ∈ (ℂ ∖ {0})) → ((abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) < 𝑧 ↔ (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧))
37	36	imbi2d 330	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑣 ∈ (ℂ ∖ {0})) → (((abs‘(𝑣 − 𝐸)) < 𝑤 → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) < 𝑧) ↔ ((abs‘(𝑣 − 𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧)))
38	37	ralbidva 2985	. . . . . . . 8 ⊢ (𝜑 → (∀𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣 − 𝐸)) < 𝑤 → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) < 𝑧) ↔ ∀𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣 − 𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧)))
39	38	rexbidv 3052	. . . . . . 7 ⊢ (𝜑 → (∃𝑤 ∈ ℝ+ ∀𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣 − 𝐸)) < 𝑤 → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) < 𝑧) ↔ ∃𝑤 ∈ ℝ+ ∀𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣 − 𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧)))
40	39	biimpar 502	. . . . . 6 ⊢ ((𝜑 ∧ ∃𝑤 ∈ ℝ+ ∀𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣 − 𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧)) → ∃𝑤 ∈ ℝ+ ∀𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣 − 𝐸)) < 𝑤 → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) < 𝑧))
41	26, 40	syldan 487	. . . . 5 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ+) → ∃𝑤 ∈ ℝ+ ∀𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣 − 𝐸)) < 𝑤 → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) < 𝑧))
42	12, 17, 5, 23, 41	rlimcn1 14319	. . . 4 ⊢ (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥 ∈ 𝐴 ↦ 𝐶)) ⇝𝑟 ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))
43		eqidd 2623	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐶) = (𝑥 ∈ 𝐴 ↦ 𝐶))
44		eqidd 2623	. . . . 5 ⊢ (𝜑 → (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) = (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)))
45		oveq2 6658	. . . . 5 ⊢ (𝑦 = 𝐶 → (1 / 𝑦) = (1 / 𝐶))
46	10, 43, 44, 45	fmptco 6396	. . . 4 ⊢ (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥 ∈ 𝐴 ↦ 𝐶)) = (𝑥 ∈ 𝐴 ↦ (1 / 𝐶)))
47	42, 46, 33	3brtr3d 4684	. . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (1 / 𝐶)) ⇝𝑟 (1 / 𝐸))
48	3, 8, 2, 47	rlimmul 14375	. 2 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐵 · (1 / 𝐶))) ⇝𝑟 (𝐷 · (1 / 𝐸)))
49	3, 6, 7	divrecd 10804	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐵 / 𝐶) = (𝐵 · (1 / 𝐶)))
50	49	mpteq2dva 4744	. 2 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐵 / 𝐶)) = (𝑥 ∈ 𝐴 ↦ (𝐵 · (1 / 𝐶))))
51		rlimcl 14234	. . . 4 ⊢ ((𝑥 ∈ 𝐴 ↦ 𝐵) ⇝𝑟 𝐷 → 𝐷 ∈ ℂ)
52	2, 51	syl 17	. . 3 ⊢ (𝜑 → 𝐷 ∈ ℂ)
53	52, 14, 15	divrecd 10804	. 2 ⊢ (𝜑 → (𝐷 / 𝐸) = (𝐷 · (1 / 𝐸)))
54	48, 50, 53	3brtr4d 4685	1 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐵 / 𝐶)) ⇝𝑟 (𝐷 / 𝐸))

Syntax hints:   → wi 4   ∧ wa 384   = wceq 1483   ∈ wcel 1990   ≠ wne 2794  ∀wral 2912  ∃wrex 2913   ∖ cdif 3571  ifcif 4086  {csn 4177   class class class wbr 4653   ↦ cmpt 4729   ∘ ccom 5118  ‘cfv 5888  (class class class)co 6650  ℂcc 9934  0cc0 9936  1c1 9937   · cmul 9941   < clt 10074   ≤ cle 10075   − cmin 10266   / cdiv 10684  2c2 11070  ℝ⁺crp 11832  abscabs 13974   ⇝_𝑟 crli 14216

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-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  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-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-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-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-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-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-er 7742  df-pm 7860  df-en 7956  df-dom 7957  df-sdom 7958  df-sup 8348  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-n0 11293  df-z 11378  df-uz 11688  df-rp 11833  df-seq 12802  df-exp 12861  df-cj 13839  df-re 13840  df-im 13841  df-sqrt 13975  df-abs 13976  df-rlim 14220

This theorem is referenced by:  logexprlim  24950  chebbnd2  25166  chto1lb  25167  pnt2  25302  pnt  25303