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Theorem rlimdiv 14224
 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.5 (𝜑 → (𝑥𝐴𝐵) ⇝𝑟 𝐷)
rlimadd.6 (𝜑 → (𝑥𝐴𝐶) ⇝𝑟 𝐸)
rlimdiv.7 (𝜑𝐸 ≠ 0)
rlimdiv.8 ((𝜑𝑥𝐴) → 𝐶 ≠ 0)
Assertion
Ref Expression
rlimdiv (𝜑 → (𝑥𝐴 ↦ (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.
StepHypRef Expression
1 rlimadd.3 . . . 4 ((𝜑𝑥𝐴) → 𝐵𝑉)
2 rlimadd.5 . . . 4 (𝜑 → (𝑥𝐴𝐵) ⇝𝑟 𝐷)
31, 2rlimmptrcl 14186 . . 3 ((𝜑𝑥𝐴) → 𝐵 ∈ ℂ)
4 rlimadd.4 . . . . 5 ((𝜑𝑥𝐴) → 𝐶𝑉)
5 rlimadd.6 . . . . 5 (𝜑 → (𝑥𝐴𝐶) ⇝𝑟 𝐸)
64, 5rlimmptrcl 14186 . . . 4 ((𝜑𝑥𝐴) → 𝐶 ∈ ℂ)
7 rlimdiv.8 . . . 4 ((𝜑𝑥𝐴) → 𝐶 ≠ 0)
86, 7reccld 10673 . . 3 ((𝜑𝑥𝐴) → (1 / 𝐶) ∈ ℂ)
9 eldifsn 4260 . . . . . . 7 (𝐶 ∈ (ℂ ∖ {0}) ↔ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0))
106, 7, 9sylanbrc 695 . . . . . 6 ((𝜑𝑥𝐴) → 𝐶 ∈ (ℂ ∖ {0}))
11 eqid 2610 . . . . . 6 (𝑥𝐴𝐶) = (𝑥𝐴𝐶)
1210, 11fmptd 6292 . . . . 5 (𝜑 → (𝑥𝐴𝐶):𝐴⟶(ℂ ∖ {0}))
13 rlimcl 14082 . . . . . . 7 ((𝑥𝐴𝐶) ⇝𝑟 𝐸𝐸 ∈ ℂ)
145, 13syl 17 . . . . . 6 (𝜑𝐸 ∈ ℂ)
15 rlimdiv.7 . . . . . 6 (𝜑𝐸 ≠ 0)
16 eldifsn 4260 . . . . . 6 (𝐸 ∈ (ℂ ∖ {0}) ↔ (𝐸 ∈ ℂ ∧ 𝐸 ≠ 0))
1714, 15, 16sylanbrc 695 . . . . 5 (𝜑𝐸 ∈ (ℂ ∖ {0}))
18 eldifsn 4260 . . . . . . . 8 (𝑦 ∈ (ℂ ∖ {0}) ↔ (𝑦 ∈ ℂ ∧ 𝑦 ≠ 0))
19 reccl 10571 . . . . . . . 8 ((𝑦 ∈ ℂ ∧ 𝑦 ≠ 0) → (1 / 𝑦) ∈ ℂ)
2018, 19sylbi 206 . . . . . . 7 (𝑦 ∈ (ℂ ∖ {0}) → (1 / 𝑦) ∈ ℂ)
2120adantl 481 . . . . . 6 ((𝜑𝑦 ∈ (ℂ ∖ {0})) → (1 / 𝑦) ∈ ℂ)
22 eqid 2610 . . . . . 6 (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) = (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))
2321, 22fmptd 6292 . . . . 5 (𝜑 → (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)):(ℂ ∖ {0})⟶ℂ)
24 eqid 2610 . . . . . . . 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))
2524reccn2 14175 . . . . . . 7 ((𝐸 ∈ (ℂ ∖ {0}) ∧ 𝑧 ∈ ℝ+) → ∃𝑤 ∈ ℝ+𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧))
2617, 25sylan 487 . . . . . 6 ((𝜑𝑧 ∈ ℝ+) → ∃𝑤 ∈ ℝ+𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧))
27 oveq2 6557 . . . . . . . . . . . . . 14 (𝑦 = 𝑣 → (1 / 𝑦) = (1 / 𝑣))
28 ovex 6577 . . . . . . . . . . . . . 14 (1 / 𝑣) ∈ V
2927, 22, 28fvmpt 6191 . . . . . . . . . . . . 13 (𝑣 ∈ (ℂ ∖ {0}) → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) = (1 / 𝑣))
30 oveq2 6557 . . . . . . . . . . . . . . 15 (𝑦 = 𝐸 → (1 / 𝑦) = (1 / 𝐸))
31 ovex 6577 . . . . . . . . . . . . . . 15 (1 / 𝐸) ∈ V
3230, 22, 31fvmpt 6191 . . . . . . . . . . . . . 14 (𝐸 ∈ (ℂ ∖ {0}) → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸) = (1 / 𝐸))
3317, 32syl 17 . . . . . . . . . . . . 13 (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸) = (1 / 𝐸))
3429, 33oveqan12rd 6569 . . . . . . . . . . . 12 ((𝜑𝑣 ∈ (ℂ ∖ {0})) → (((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸)) = ((1 / 𝑣) − (1 / 𝐸)))
3534fveq2d 6107 . . . . . . . . . . 11 ((𝜑𝑣 ∈ (ℂ ∖ {0})) → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) = (abs‘((1 / 𝑣) − (1 / 𝐸))))
3635breq1d 4593 . . . . . . . . . 10 ((𝜑𝑣 ∈ (ℂ ∖ {0})) → ((abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) < 𝑧 ↔ (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧))
3736imbi2d 329 . . . . . . . . 9 ((𝜑𝑣 ∈ (ℂ ∖ {0})) → (((abs‘(𝑣𝐸)) < 𝑤 → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) < 𝑧) ↔ ((abs‘(𝑣𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧)))
3837ralbidva 2968 . . . . . . . 8 (𝜑 → (∀𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣𝐸)) < 𝑤 → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) < 𝑧) ↔ ∀𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧)))
3938rexbidv 3034 . . . . . . 7 (𝜑 → (∃𝑤 ∈ ℝ+𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣𝐸)) < 𝑤 → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) < 𝑧) ↔ ∃𝑤 ∈ ℝ+𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧)))
4039biimpar 501 . . . . . 6 ((𝜑 ∧ ∃𝑤 ∈ ℝ+𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧)) → ∃𝑤 ∈ ℝ+𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣𝐸)) < 𝑤 → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) < 𝑧))
4126, 40syldan 486 . . . . 5 ((𝜑𝑧 ∈ ℝ+) → ∃𝑤 ∈ ℝ+𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣𝐸)) < 𝑤 → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) < 𝑧))
4212, 17, 5, 23, 41rlimcn1 14167 . . . 4 (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥𝐴𝐶)) ⇝𝑟 ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))
43 eqidd 2611 . . . . 5 (𝜑 → (𝑥𝐴𝐶) = (𝑥𝐴𝐶))
44 eqidd 2611 . . . . 5 (𝜑 → (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) = (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)))
45 oveq2 6557 . . . . 5 (𝑦 = 𝐶 → (1 / 𝑦) = (1 / 𝐶))
4610, 43, 44, 45fmptco 6303 . . . 4 (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥𝐴𝐶)) = (𝑥𝐴 ↦ (1 / 𝐶)))
4742, 46, 333brtr3d 4614 . . 3 (𝜑 → (𝑥𝐴 ↦ (1 / 𝐶)) ⇝𝑟 (1 / 𝐸))
483, 8, 2, 47rlimmul 14223 . 2 (𝜑 → (𝑥𝐴 ↦ (𝐵 · (1 / 𝐶))) ⇝𝑟 (𝐷 · (1 / 𝐸)))
493, 6, 7divrecd 10683 . . 3 ((𝜑𝑥𝐴) → (𝐵 / 𝐶) = (𝐵 · (1 / 𝐶)))
5049mpteq2dva 4672 . 2 (𝜑 → (𝑥𝐴 ↦ (𝐵 / 𝐶)) = (𝑥𝐴 ↦ (𝐵 · (1 / 𝐶))))
51 rlimcl 14082 . . . 4 ((𝑥𝐴𝐵) ⇝𝑟 𝐷𝐷 ∈ ℂ)
522, 51syl 17 . . 3 (𝜑𝐷 ∈ ℂ)
5352, 14, 15divrecd 10683 . 2 (𝜑 → (𝐷 / 𝐸) = (𝐷 · (1 / 𝐸)))
5448, 50, 533brtr4d 4615 1 (𝜑 → (𝑥𝐴 ↦ (𝐵 / 𝐶)) ⇝𝑟 (𝐷 / 𝐸))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977   ≠ wne 2780  ∀wral 2896  ∃wrex 2897   ∖ cdif 3537  ifcif 4036  {csn 4125   class class class wbr 4583   ↦ cmpt 4643   ∘ ccom 5042  ‘cfv 5804  (class class class)co 6549  ℂcc 9813  0cc0 9815  1c1 9816   · cmul 9820   < clt 9953   ≤ cle 9954   − cmin 10145   / cdiv 10563  2c2 10947  ℝ+crp 11708  abscabs 13822   ⇝𝑟 crli 14064 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-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  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-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-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-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-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-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-er 7629  df-pm 7747  df-en 7842  df-dom 7843  df-sdom 7844  df-sup 8231  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-n0 11170  df-z 11255  df-uz 11564  df-rp 11709  df-seq 12664  df-exp 12723  df-cj 13687  df-re 13688  df-im 13689  df-sqrt 13823  df-abs 13824  df-rlim 14068 This theorem is referenced by:  logexprlim  24750  chebbnd2  24966  chto1lb  24967  pnt2  25102  pnt  25103
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