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Theorem rlimdiv 14980
 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 14942 . . 3 ((𝜑𝑥𝐴) → 𝐵 ∈ ℂ)
4 rlimadd.4 . . . . 5 ((𝜑𝑥𝐴) → 𝐶𝑉)
5 rlimadd.6 . . . . 5 (𝜑 → (𝑥𝐴𝐶) ⇝𝑟 𝐸)
64, 5rlimmptrcl 14942 . . . 4 ((𝜑𝑥𝐴) → 𝐶 ∈ ℂ)
7 rlimdiv.8 . . . 4 ((𝜑𝑥𝐴) → 𝐶 ≠ 0)
86, 7reccld 11385 . . 3 ((𝜑𝑥𝐴) → (1 / 𝐶) ∈ ℂ)
9 eldifsn 4693 . . . . . . 7 (𝐶 ∈ (ℂ ∖ {0}) ↔ (𝐶 ∈ ℂ ∧ 𝐶 ≠ 0))
106, 7, 9sylanbrc 585 . . . . . 6 ((𝜑𝑥𝐴) → 𝐶 ∈ (ℂ ∖ {0}))
1110fmpttd 6853 . . . . 5 (𝜑 → (𝑥𝐴𝐶):𝐴⟶(ℂ ∖ {0}))
12 rlimcl 14838 . . . . . . 7 ((𝑥𝐴𝐶) ⇝𝑟 𝐸𝐸 ∈ ℂ)
135, 12syl 17 . . . . . 6 (𝜑𝐸 ∈ ℂ)
14 rlimdiv.7 . . . . . 6 (𝜑𝐸 ≠ 0)
15 eldifsn 4693 . . . . . 6 (𝐸 ∈ (ℂ ∖ {0}) ↔ (𝐸 ∈ ℂ ∧ 𝐸 ≠ 0))
1613, 14, 15sylanbrc 585 . . . . 5 (𝜑𝐸 ∈ (ℂ ∖ {0}))
17 eldifsn 4693 . . . . . . . 8 (𝑦 ∈ (ℂ ∖ {0}) ↔ (𝑦 ∈ ℂ ∧ 𝑦 ≠ 0))
18 reccl 11281 . . . . . . . 8 ((𝑦 ∈ ℂ ∧ 𝑦 ≠ 0) → (1 / 𝑦) ∈ ℂ)
1917, 18sylbi 219 . . . . . . 7 (𝑦 ∈ (ℂ ∖ {0}) → (1 / 𝑦) ∈ ℂ)
2019adantl 484 . . . . . 6 ((𝜑𝑦 ∈ (ℂ ∖ {0})) → (1 / 𝑦) ∈ ℂ)
2120fmpttd 6853 . . . . 5 (𝜑 → (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)):(ℂ ∖ {0})⟶ℂ)
22 eqid 2820 . . . . . . . 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))
2322reccn2 14931 . . . . . . 7 ((𝐸 ∈ (ℂ ∖ {0}) ∧ 𝑧 ∈ ℝ+) → ∃𝑤 ∈ ℝ+𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧))
2416, 23sylan 582 . . . . . 6 ((𝜑𝑧 ∈ ℝ+) → ∃𝑤 ∈ ℝ+𝑣 ∈ (ℂ ∖ {0})((abs‘(𝑣𝐸)) < 𝑤 → (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧))
25 oveq2 7139 . . . . . . . . . . . . . 14 (𝑦 = 𝑣 → (1 / 𝑦) = (1 / 𝑣))
26 eqid 2820 . . . . . . . . . . . . . 14 (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) = (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))
27 ovex 7164 . . . . . . . . . . . . . 14 (1 / 𝑣) ∈ V
2825, 26, 27fvmpt 6742 . . . . . . . . . . . . 13 (𝑣 ∈ (ℂ ∖ {0}) → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) = (1 / 𝑣))
29 oveq2 7139 . . . . . . . . . . . . . . 15 (𝑦 = 𝐸 → (1 / 𝑦) = (1 / 𝐸))
30 ovex 7164 . . . . . . . . . . . . . . 15 (1 / 𝐸) ∈ V
3129, 26, 30fvmpt 6742 . . . . . . . . . . . . . 14 (𝐸 ∈ (ℂ ∖ {0}) → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸) = (1 / 𝐸))
3216, 31syl 17 . . . . . . . . . . . . 13 (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸) = (1 / 𝐸))
3328, 32oveqan12rd 7151 . . . . . . . . . . . 12 ((𝜑𝑣 ∈ (ℂ ∖ {0})) → (((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸)) = ((1 / 𝑣) − (1 / 𝐸)))
3433fveq2d 6648 . . . . . . . . . . 11 ((𝜑𝑣 ∈ (ℂ ∖ {0})) → (abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) = (abs‘((1 / 𝑣) − (1 / 𝐸))))
3534breq1d 5050 . . . . . . . . . 10 ((𝜑𝑣 ∈ (ℂ ∖ {0})) → ((abs‘(((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝑣) − ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))) < 𝑧 ↔ (abs‘((1 / 𝑣) − (1 / 𝐸))) < 𝑧))
3635imbi2d 343 . . . . . . . . 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)))
3736ralbidva 3183 . . . . . . . 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)))
3837rexbidv 3284 . . . . . . 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)))
3938biimpar 480 . . . . . 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))
4024, 39syldan 593 . . . . 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))
4111, 16, 5, 21, 40rlimcn1 14923 . . . 4 (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥𝐴𝐶)) ⇝𝑟 ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))‘𝐸))
42 eqidd 2821 . . . . 5 (𝜑 → (𝑥𝐴𝐶) = (𝑥𝐴𝐶))
43 eqidd 2821 . . . . 5 (𝜑 → (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) = (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)))
44 oveq2 7139 . . . . 5 (𝑦 = 𝐶 → (1 / 𝑦) = (1 / 𝐶))
4510, 42, 43, 44fmptco 6865 . . . 4 (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥𝐴𝐶)) = (𝑥𝐴 ↦ (1 / 𝐶)))
4641, 45, 323brtr3d 5071 . . 3 (𝜑 → (𝑥𝐴 ↦ (1 / 𝐶)) ⇝𝑟 (1 / 𝐸))
473, 8, 2, 46rlimmul 14979 . 2 (𝜑 → (𝑥𝐴 ↦ (𝐵 · (1 / 𝐶))) ⇝𝑟 (𝐷 · (1 / 𝐸)))
483, 6, 7divrecd 11395 . . 3 ((𝜑𝑥𝐴) → (𝐵 / 𝐶) = (𝐵 · (1 / 𝐶)))
4948mpteq2dva 5135 . 2 (𝜑 → (𝑥𝐴 ↦ (𝐵 / 𝐶)) = (𝑥𝐴 ↦ (𝐵 · (1 / 𝐶))))
50 rlimcl 14838 . . . 4 ((𝑥𝐴𝐵) ⇝𝑟 𝐷𝐷 ∈ ℂ)
512, 50syl 17 . . 3 (𝜑𝐷 ∈ ℂ)
5251, 13, 14divrecd 11395 . 2 (𝜑 → (𝐷 / 𝐸) = (𝐷 · (1 / 𝐸)))
5347, 49, 523brtr4d 5072 1 (𝜑 → (𝑥𝐴 ↦ (𝐵 / 𝐶)) ⇝𝑟 (𝐷 / 𝐸))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 398   = wceq 1537   ∈ wcel 2114   ≠ wne 3006  ∀wral 3125  ∃wrex 3126   ∖ cdif 3909  ifcif 4441  {csn 4541   class class class wbr 5040   ↦ cmpt 5120   ∘ ccom 5533  ‘cfv 6329  (class class class)co 7131  ℂcc 10511  0cc0 10513  1c1 10514   · cmul 10518   < clt 10651   ≤ cle 10652   − cmin 10846   / cdiv 11273  2c2 11669  ℝ+crp 12366  abscabs 14571   ⇝𝑟 crli 14820 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 2792  ax-sep 5177  ax-nul 5184  ax-pow 5240  ax-pr 5304  ax-un 7437  ax-cnex 10569  ax-resscn 10570  ax-1cn 10571  ax-icn 10572  ax-addcl 10573  ax-addrcl 10574  ax-mulcl 10575  ax-mulrcl 10576  ax-mulcom 10577  ax-addass 10578  ax-mulass 10579  ax-distr 10580  ax-i2m1 10581  ax-1ne0 10582  ax-1rid 10583  ax-rnegex 10584  ax-rrecex 10585  ax-cnre 10586  ax-pre-lttri 10587  ax-pre-lttrn 10588  ax-pre-ltadd 10589  ax-pre-mulgt0 10590  ax-pre-sup 10591  ax-mulf 10593 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 2653  df-clab 2799  df-cleq 2813  df-clel 2891  df-nfc 2959  df-ne 3007  df-nel 3111  df-ral 3130  df-rex 3131  df-reu 3132  df-rmo 3133  df-rab 3134  df-v 3475  df-sbc 3752  df-csb 3860  df-dif 3915  df-un 3917  df-in 3919  df-ss 3928  df-pss 3930  df-nul 4268  df-if 4442  df-pw 4515  df-sn 4542  df-pr 4544  df-tp 4546  df-op 4548  df-uni 4813  df-iun 4895  df-br 5041  df-opab 5103  df-mpt 5121  df-tr 5147  df-id 5434  df-eprel 5439  df-po 5448  df-so 5449  df-fr 5488  df-we 5490  df-xp 5535  df-rel 5536  df-cnv 5537  df-co 5538  df-dm 5539  df-rn 5540  df-res 5541  df-ima 5542  df-pred 6122  df-ord 6168  df-on 6169  df-lim 6170  df-suc 6171  df-iota 6288  df-fun 6331  df-fn 6332  df-f 6333  df-f1 6334  df-fo 6335  df-f1o 6336  df-fv 6337  df-riota 7089  df-ov 7134  df-oprab 7135  df-mpo 7136  df-om 7557  df-2nd 7666  df-wrecs 7923  df-recs 7984  df-rdg 8022  df-er 8265  df-pm 8385  df-en 8486  df-dom 8487  df-sdom 8488  df-sup 8882  df-pnf 10653  df-mnf 10654  df-xr 10655  df-ltxr 10656  df-le 10657  df-sub 10848  df-neg 10849  df-div 11274  df-nn 11615  df-2 11677  df-3 11678  df-n0 11875  df-z 11959  df-uz 12221  df-rp 12367  df-seq 13352  df-exp 13413  df-cj 14436  df-re 14437  df-im 14438  df-sqrt 14572  df-abs 14573  df-rlim 14824 This theorem is referenced by:  logexprlim  25785  chebbnd2  26037  chto1lb  26038  pnt2  26173  pnt  26174
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