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Theorem cmetcvg 25270
Description: The convergence of a Cauchy filter in a complete metric space. (Contributed by Mario Carneiro, 14-Oct-2015.)
Hypothesis
Ref Expression
iscmet.1 𝐽 = (MetOpen‘𝐷)
Assertion
Ref Expression
cmetcvg ((𝐷 ∈ (CMet‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷)) → (𝐽 fLim 𝐹) ≠ ∅)

Proof of Theorem cmetcvg
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 iscmet.1 . . . 4 𝐽 = (MetOpen‘𝐷)
21iscmet 25269 . . 3 (𝐷 ∈ (CMet‘𝑋) ↔ (𝐷 ∈ (Met‘𝑋) ∧ ∀𝑓 ∈ (CauFil‘𝐷)(𝐽 fLim 𝑓) ≠ ∅))
32simprbi 498 . 2 (𝐷 ∈ (CMet‘𝑋) → ∀𝑓 ∈ (CauFil‘𝐷)(𝐽 fLim 𝑓) ≠ ∅)
4 oveq2 7364 . . . 4 (𝑓 = 𝐹 → (𝐽 fLim 𝑓) = (𝐽 fLim 𝐹))
54neeq1d 2993 . . 3 (𝑓 = 𝐹 → ((𝐽 fLim 𝑓) ≠ ∅ ↔ (𝐽 fLim 𝐹) ≠ ∅))
65rspccva 3559 . 2 ((∀𝑓 ∈ (CauFil‘𝐷)(𝐽 fLim 𝑓) ≠ ∅ ∧ 𝐹 ∈ (CauFil‘𝐷)) → (𝐽 fLim 𝐹) ≠ ∅)
73, 6sylan 586 1 ((𝐷 ∈ (CMet‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷)) → (𝐽 fLim 𝐹) ≠ ∅)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 396   = wceq 1547  wcel 2119  wne 2934  wral 3053  c0 4261  cfv 6485  (class class class)co 7356  Metcmet 21333  MetOpencmopn 21337   fLim cflim 23917  CauFilccfil 25237  CMetccmet 25239
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-10 2152  ax-11 2168  ax-12 2189  ax-ext 2711  ax-sep 5218  ax-nul 5228  ax-pr 5362
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-nf 1791  df-sb 2074  df-mo 2543  df-eu 2573  df-clab 2718  df-cleq 2731  df-clel 2814  df-nfc 2888  df-ne 2935  df-ral 3054  df-rex 3064  df-rab 3392  df-v 3433  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4262  df-if 4455  df-pw 4531  df-sn 4556  df-pr 4558  df-op 4562  df-uni 4839  df-br 5073  df-opab 5135  df-mpt 5154  df-id 5513  df-xp 5624  df-rel 5625  df-cnv 5626  df-co 5627  df-dm 5628  df-iota 6441  df-fun 6487  df-fv 6493  df-ov 7359  df-cmet 25242
This theorem is referenced by:  cmetcaulem  25273  metsscmetcld  25300  cmetss  25301  cmetcusp  25339  minveclem4a  25415  fmcncfil  34115
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