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Theorem rlimres 14907
 Description: The restriction of a function converges if the original converges. (Contributed by Mario Carneiro, 16-Sep-2014.)
Assertion
Ref Expression
rlimres (𝐹𝑟 𝐴 → (𝐹𝐵) ⇝𝑟 𝐴)

Proof of Theorem rlimres
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 inss1 4203 . . . . . . . 8 (dom 𝐹𝐵) ⊆ dom 𝐹
2 ssralv 4031 . . . . . . . 8 ((dom 𝐹𝐵) ⊆ dom 𝐹 → (∀𝑧 ∈ dom 𝐹(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥) → ∀𝑧 ∈ (dom 𝐹𝐵)(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥)))
31, 2ax-mp 5 . . . . . . 7 (∀𝑧 ∈ dom 𝐹(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥) → ∀𝑧 ∈ (dom 𝐹𝐵)(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥))
43reximi 3241 . . . . . 6 (∃𝑦 ∈ ℝ ∀𝑧 ∈ dom 𝐹(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥) → ∃𝑦 ∈ ℝ ∀𝑧 ∈ (dom 𝐹𝐵)(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥))
54ralimi 3158 . . . . 5 (∀𝑥 ∈ ℝ+𝑦 ∈ ℝ ∀𝑧 ∈ dom 𝐹(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥) → ∀𝑥 ∈ ℝ+𝑦 ∈ ℝ ∀𝑧 ∈ (dom 𝐹𝐵)(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥))
65anim2i 618 . . . 4 ((𝐴 ∈ ℂ ∧ ∀𝑥 ∈ ℝ+𝑦 ∈ ℝ ∀𝑧 ∈ dom 𝐹(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥)) → (𝐴 ∈ ℂ ∧ ∀𝑥 ∈ ℝ+𝑦 ∈ ℝ ∀𝑧 ∈ (dom 𝐹𝐵)(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥)))
76a1i 11 . . 3 (𝐹𝑟 𝐴 → ((𝐴 ∈ ℂ ∧ ∀𝑥 ∈ ℝ+𝑦 ∈ ℝ ∀𝑧 ∈ dom 𝐹(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥)) → (𝐴 ∈ ℂ ∧ ∀𝑥 ∈ ℝ+𝑦 ∈ ℝ ∀𝑧 ∈ (dom 𝐹𝐵)(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥))))
8 rlimf 14850 . . . 4 (𝐹𝑟 𝐴𝐹:dom 𝐹⟶ℂ)
9 rlimss 14851 . . . 4 (𝐹𝑟 𝐴 → dom 𝐹 ⊆ ℝ)
10 eqidd 2820 . . . 4 ((𝐹𝑟 𝐴𝑧 ∈ dom 𝐹) → (𝐹𝑧) = (𝐹𝑧))
118, 9, 10rlim 14844 . . 3 (𝐹𝑟 𝐴 → (𝐹𝑟 𝐴 ↔ (𝐴 ∈ ℂ ∧ ∀𝑥 ∈ ℝ+𝑦 ∈ ℝ ∀𝑧 ∈ dom 𝐹(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥))))
12 fssres 6537 . . . . . 6 ((𝐹:dom 𝐹⟶ℂ ∧ (dom 𝐹𝐵) ⊆ dom 𝐹) → (𝐹 ↾ (dom 𝐹𝐵)):(dom 𝐹𝐵)⟶ℂ)
138, 1, 12sylancl 588 . . . . 5 (𝐹𝑟 𝐴 → (𝐹 ↾ (dom 𝐹𝐵)):(dom 𝐹𝐵)⟶ℂ)
14 resres 5859 . . . . . . 7 ((𝐹 ↾ dom 𝐹) ↾ 𝐵) = (𝐹 ↾ (dom 𝐹𝐵))
15 ffn 6507 . . . . . . . . 9 (𝐹:dom 𝐹⟶ℂ → 𝐹 Fn dom 𝐹)
16 fnresdm 6459 . . . . . . . . 9 (𝐹 Fn dom 𝐹 → (𝐹 ↾ dom 𝐹) = 𝐹)
178, 15, 163syl 18 . . . . . . . 8 (𝐹𝑟 𝐴 → (𝐹 ↾ dom 𝐹) = 𝐹)
1817reseq1d 5845 . . . . . . 7 (𝐹𝑟 𝐴 → ((𝐹 ↾ dom 𝐹) ↾ 𝐵) = (𝐹𝐵))
1914, 18syl5eqr 2868 . . . . . 6 (𝐹𝑟 𝐴 → (𝐹 ↾ (dom 𝐹𝐵)) = (𝐹𝐵))
2019feq1d 6492 . . . . 5 (𝐹𝑟 𝐴 → ((𝐹 ↾ (dom 𝐹𝐵)):(dom 𝐹𝐵)⟶ℂ ↔ (𝐹𝐵):(dom 𝐹𝐵)⟶ℂ))
2113, 20mpbid 234 . . . 4 (𝐹𝑟 𝐴 → (𝐹𝐵):(dom 𝐹𝐵)⟶ℂ)
221, 9sstrid 3976 . . . 4 (𝐹𝑟 𝐴 → (dom 𝐹𝐵) ⊆ ℝ)
23 elinel2 4171 . . . . . 6 (𝑧 ∈ (dom 𝐹𝐵) → 𝑧𝐵)
2423fvresd 6683 . . . . 5 (𝑧 ∈ (dom 𝐹𝐵) → ((𝐹𝐵)‘𝑧) = (𝐹𝑧))
2524adantl 484 . . . 4 ((𝐹𝑟 𝐴𝑧 ∈ (dom 𝐹𝐵)) → ((𝐹𝐵)‘𝑧) = (𝐹𝑧))
2621, 22, 25rlim 14844 . . 3 (𝐹𝑟 𝐴 → ((𝐹𝐵) ⇝𝑟 𝐴 ↔ (𝐴 ∈ ℂ ∧ ∀𝑥 ∈ ℝ+𝑦 ∈ ℝ ∀𝑧 ∈ (dom 𝐹𝐵)(𝑦𝑧 → (abs‘((𝐹𝑧) − 𝐴)) < 𝑥))))
277, 11, 263imtr4d 296 . 2 (𝐹𝑟 𝐴 → (𝐹𝑟 𝐴 → (𝐹𝐵) ⇝𝑟 𝐴))
2827pm2.43i 52 1 (𝐹𝑟 𝐴 → (𝐹𝐵) ⇝𝑟 𝐴)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 398   = wceq 1530   ∈ wcel 2107  ∀wral 3136  ∃wrex 3137   ∩ cin 3933   ⊆ wss 3934   class class class wbr 5057  dom cdm 5548   ↾ cres 5550   Fn wfn 6343  ⟶wf 6344  ‘cfv 6348  (class class class)co 7148  ℂcc 10527  ℝcr 10528   < clt 10667   ≤ cle 10668   − cmin 10862  ℝ+crp 12381  abscabs 14585   ⇝𝑟 crli 14834 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2153  ax-12 2169  ax-ext 2791  ax-sep 5194  ax-nul 5201  ax-pow 5257  ax-pr 5320  ax-un 7453  ax-cnex 10585  ax-resscn 10586 This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1083  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-mo 2616  df-eu 2648  df-clab 2798  df-cleq 2812  df-clel 2891  df-nfc 2961  df-ne 3015  df-ral 3141  df-rex 3142  df-rab 3145  df-v 3495  df-sbc 3771  df-dif 3937  df-un 3939  df-in 3941  df-ss 3950  df-nul 4290  df-if 4466  df-pw 4539  df-sn 4560  df-pr 4562  df-op 4566  df-uni 4831  df-br 5058  df-opab 5120  df-id 5453  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-fv 6356  df-ov 7151  df-oprab 7152  df-mpo 7153  df-pm 8401  df-rlim 14838 This theorem is referenced by:  rlimres2  14910  pnt  26182
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