Theorem rlimdiv 15002

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 14964	. . 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 14964	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ∈ ℂ)
7		rlimdiv.8	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ≠ 0)
8	6, 7	reccld 11409	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (1 / 𝐶) ∈ ℂ)
9		eldifsn 4719	. . . . . . 7 ⊢ (𝐶 ∈ (ℂ ∖ {0}) ↔ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0))
10	6, 7, 9	sylanbrc 585	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ∈ (ℂ ∖ {0}))
11	10	fmpttd 6879	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐶):𝐴⟶(ℂ ∖ {0}))
12		rlimcl 14860	. . . . . . 7 ⊢ ((𝑥 ∈ 𝐴 ↦ 𝐶) ⇝𝑟 𝐸 → 𝐸 ∈ ℂ)
13	5, 12	syl 17	. . . . . 6 ⊢ (𝜑 → 𝐸 ∈ ℂ)
14		rlimdiv.7	. . . . . 6 ⊢ (𝜑 → 𝐸 ≠ 0)
15		eldifsn 4719	. . . . . 6 ⊢ (𝐸 ∈ (ℂ ∖ {0}) ↔ (𝐸 ∈ ℂ ∧ 𝐸 ≠ 0))
16	13, 14, 15	sylanbrc 585	. . . . 5 ⊢ (𝜑 → 𝐸 ∈ (ℂ ∖ {0}))
17		eldifsn 4719	. . . . . . . 8 ⊢ (𝑦 ∈ (ℂ ∖ {0}) ↔ (𝑦 ∈ ℂ ∧ 𝑦 ≠ 0))
18		reccl 11305	. . . . . . . 8 ⊢ ((𝑦 ∈ ℂ ∧ 𝑦 ≠ 0) → (1 / 𝑦) ∈ ℂ)
19	17, 18	sylbi 219	. . . . . . 7 ⊢ (𝑦 ∈ (ℂ ∖ {0}) → (1 / 𝑦) ∈ ℂ)
20	19	adantl 484	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ (ℂ ∖ {0})) → (1 / 𝑦) ∈ ℂ)
21	20	fmpttd 6879	. . . . 5 ⊢ (𝜑 → (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)):(ℂ ∖ {0})⟶ℂ)
22		eqid 2821	. . . . . . . 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))
23	22	reccn2 14953	. . . . . . 7 ⊢ ((𝐸 ∈ (ℂ ∖ {0}) ∧ 𝑧 ∈ ℝ+) → ∃𝑤 ∈ ℝ+ ∀𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣 − 𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧))
24	16, 23	sylan 582	. . . . . 6 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ+) → ∃𝑤 ∈ ℝ+ ∀𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣 − 𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧))
25		oveq2 7164	. . . . . . . . . . . . . 14 ⊢ (𝑦 = 𝑣 → (1 / 𝑦) = (1 / 𝑣))
26		eqid 2821	. . . . . . . . . . . . . 14 ⊢ (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) = (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))
27		ovex 7189	. . . . . . . . . . . . . 14 ⊢ (1 / 𝑣) ∈ V
28	25, 26, 27	fvmpt 6768	. . . . . . . . . . . . 13 ⊢ (𝑣 ∈ (ℂ ∖ {0}) → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) = (1 / 𝑣))
29		oveq2 7164	. . . . . . . . . . . . . . 15 ⊢ (𝑦 = 𝐸 → (1 / 𝑦) = (1 / 𝐸))
30		ovex 7189	. . . . . . . . . . . . . . 15 ⊢ (1 / 𝐸) ∈ V
31	29, 26, 30	fvmpt 6768	. . . . . . . . . . . . . 14 ⊢ (𝐸 ∈ (ℂ ∖ {0}) → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸) = (1 / 𝐸))
32	16, 31	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸) = (1 / 𝐸))
33	28, 32	oveqan12rd 7176	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑣 ∈ (ℂ ∖ {0})) → (((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸)) = ((1 / 𝑣) − (1 / 𝐸)))
34	33	fveq2d 6674	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑣 ∈ (ℂ ∖ {0})) → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) = (abs‘((1 / 𝑣) − (1 / 𝐸))))
35	34	breq1d 5076	. . . . . . . . . 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))
36	35	imbi2d 343	. . . . . . . . 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)))
37	36	ralbidva 3196	. . . . . . . 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)))
38	37	rexbidv 3297	. . . . . . 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)))
39	38	biimpar 480	. . . . . 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))
40	24, 39	syldan 593	. . . . 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))
41	11, 16, 5, 21, 40	rlimcn1 14945	. . . 4 ⊢ (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥 ∈ 𝐴 ↦ 𝐶)) ⇝𝑟 ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))
42		eqidd 2822	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐶) = (𝑥 ∈ 𝐴 ↦ 𝐶))
43		eqidd 2822	. . . . 5 ⊢ (𝜑 → (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) = (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)))
44		oveq2 7164	. . . . 5 ⊢ (𝑦 = 𝐶 → (1 / 𝑦) = (1 / 𝐶))
45	10, 42, 43, 44	fmptco 6891	. . . 4 ⊢ (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥 ∈ 𝐴 ↦ 𝐶)) = (𝑥 ∈ 𝐴 ↦ (1 / 𝐶)))
46	41, 45, 32	3brtr3d 5097	. . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (1 / 𝐶)) ⇝𝑟 (1 / 𝐸))
47	3, 8, 2, 46	rlimmul 15001	. 2 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐵 · (1 / 𝐶))) ⇝𝑟 (𝐷 · (1 / 𝐸)))
48	3, 6, 7	divrecd 11419	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐵 / 𝐶) = (𝐵 · (1 / 𝐶)))
49	48	mpteq2dva 5161	. 2 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐵 / 𝐶)) = (𝑥 ∈ 𝐴 ↦ (𝐵 · (1 / 𝐶))))
50		rlimcl 14860	. . . 4 ⊢ ((𝑥 ∈ 𝐴 ↦ 𝐵) ⇝𝑟 𝐷 → 𝐷 ∈ ℂ)
51	2, 50	syl 17	. . 3 ⊢ (𝜑 → 𝐷 ∈ ℂ)
52	51, 13, 14	divrecd 11419	. 2 ⊢ (𝜑 → (𝐷 / 𝐸) = (𝐷 · (1 / 𝐸)))
53	47, 49, 52	3brtr4d 5098	1 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐵 / 𝐶)) ⇝𝑟 (𝐷 / 𝐸))

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1537   ∈ wcel 2114   ≠ wne 3016  ∀wral 3138  ∃wrex 3139   ∖ cdif 3933  ifcif 4467  {csn 4567   class class class wbr 5066   ↦ cmpt 5146   ∘ ccom 5559  ‘cfv 6355  (class class class)co 7156  ℂcc 10535  0cc0 10537  1c1 10538   · cmul 10542   < clt 10675   ≤ cle 10676   − cmin 10870   / cdiv 11297  2c2 11693  ℝ⁺crp 12390  abscabs 14593   ⇝_𝑟 crli 14842

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461  ax-cnex 10593  ax-resscn 10594  ax-1cn 10595  ax-icn 10596  ax-addcl 10597  ax-addrcl 10598  ax-mulcl 10599  ax-mulrcl 10600  ax-mulcom 10601  ax-addass 10602  ax-mulass 10603  ax-distr 10604  ax-i2m1 10605  ax-1ne0 10606  ax-1rid 10607  ax-rnegex 10608  ax-rrecex 10609  ax-cnre 10610  ax-pre-lttri 10611  ax-pre-lttrn 10612  ax-pre-ltadd 10613  ax-pre-mulgt0 10614  ax-pre-sup 10615  ax-mulf 10617

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-nel 3124  df-ral 3143  df-rex 3144  df-reu 3145  df-rmo 3146  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-pss 3954  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-tp 4572  df-op 4574  df-uni 4839  df-iun 4921  df-br 5067  df-opab 5129  df-mpt 5147  df-tr 5173  df-id 5460  df-eprel 5465  df-po 5474  df-so 5475  df-fr 5514  df-we 5516  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-pred 6148  df-ord 6194  df-on 6195  df-lim 6196  df-suc 6197  df-iota 6314  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-fv 6363  df-riota 7114  df-ov 7159  df-oprab 7160  df-mpo 7161  df-om 7581  df-2nd 7690  df-wrecs 7947  df-recs 8008  df-rdg 8046  df-er 8289  df-pm 8409  df-en 8510  df-dom 8511  df-sdom 8512  df-sup 8906  df-pnf 10677  df-mnf 10678  df-xr 10679  df-ltxr 10680  df-le 10681  df-sub 10872  df-neg 10873  df-div 11298  df-nn 11639  df-2 11701  df-3 11702  df-n0 11899  df-z 11983  df-uz 12245  df-rp 12391  df-seq 13371  df-exp 13431  df-cj 14458  df-re 14459  df-im 14460  df-sqrt 14594  df-abs 14595  df-rlim 14846

This theorem is referenced by:  logexprlim  25801  chebbnd2  26053  chto1lb  26054  pnt2  26189  pnt  26190