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Theorem cmetcvg 25495
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 25494 . . 3 (𝐷 ∈ (CMet‘𝑋) ↔ (𝐷 ∈ (Met‘𝑋) ∧ ∀𝑓 ∈ (CauFil‘𝐷)(𝐽 fLim 𝑓) ≠ ∅))
32simprbi 503 . 2 (𝐷 ∈ (CMet‘𝑋) → ∀𝑓 ∈ (CauFil‘𝐷)(𝐽 fLim 𝑓) ≠ ∅)
4 oveq2 7427 . . . 4 (𝑓 = 𝐹 → (𝐽 fLim 𝑓) = (𝐽 fLim 𝐹))
54neeq1d 3019 . . 3 (𝑓 = 𝐹 → ((𝐽 fLim 𝑓) ≠ ∅ ↔ (𝐽 fLim 𝐹) ≠ ∅))
65rspccva 3582 . 2 ((∀𝑓 ∈ (CauFil‘𝐷)(𝐽 fLim 𝑓) ≠ ∅ ∧ 𝐹 ∈ (CauFil‘𝐷)) → (𝐽 fLim 𝐹) ≠ ∅)
73, 6sylan 592 1 ((𝐷 ∈ (CMet‘𝑋) ∧ 𝐹 ∈ (CauFil‘𝐷)) → (𝐽 fLim 𝐹) ≠ ∅)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wa 401   = wceq 1570  wcel 2146  wne 2960  wral 3081  c0 4286  cfv 6540  (class class class)co 7419  Metcmet 21558  MetOpencmopn 21562   fLim cflim 24142  CauFilccfil 25462  CMetccmet 25464
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2737  ax-sep 5259  ax-nul 5271  ax-pr 5406
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ne 2961  df-ral 3082  df-rex 3092  df-rab 3419  df-v 3459  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4287  df-if 4490  df-pw 4566  df-sn 4592  df-pr 4594  df-op 4598  df-uni 4875  df-br 5112  df-opab 5176  df-mpt 5195  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-iota 6496  df-fun 6542  df-fv 6548  df-ov 7422  df-cmet 25467
This theorem is used by:  cmetcaulem  25498  metsscmetcld  25525  cmetss  25526  cmetcusp  25564  minveclem4a  25640  fmcncfil  34385
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