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Theorem intcld 22927
Description: The intersection of a set of closed sets is closed. (Contributed by NM, 5-Oct-2006.)
Assertion
Ref Expression
intcld ((𝐴 ≠ ∅ ∧ 𝐴 ⊆ (Clsd‘𝐽)) → 𝐴 ∈ (Clsd‘𝐽))

Proof of Theorem intcld
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 intiin 5023 . 2 𝐴 = 𝑥𝐴 𝑥
2 dfss3 3935 . . 3 (𝐴 ⊆ (Clsd‘𝐽) ↔ ∀𝑥𝐴 𝑥 ∈ (Clsd‘𝐽))
3 iincld 22926 . . 3 ((𝐴 ≠ ∅ ∧ ∀𝑥𝐴 𝑥 ∈ (Clsd‘𝐽)) → 𝑥𝐴 𝑥 ∈ (Clsd‘𝐽))
42, 3sylan2b 594 . 2 ((𝐴 ≠ ∅ ∧ 𝐴 ⊆ (Clsd‘𝐽)) → 𝑥𝐴 𝑥 ∈ (Clsd‘𝐽))
51, 4eqeltrid 2832 1 ((𝐴 ≠ ∅ ∧ 𝐴 ⊆ (Clsd‘𝐽)) → 𝐴 ∈ (Clsd‘𝐽))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395  wcel 2109  wne 2925  wral 3044  wss 3914  c0 4296   cint 4910   ciin 4956  cfv 6511  Clsdccld 22903
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-sep 5251  ax-nul 5261  ax-pow 5320  ax-pr 5387  ax-un 7711
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-rab 3406  df-v 3449  df-dif 3917  df-un 3919  df-in 3921  df-ss 3931  df-nul 4297  df-if 4489  df-pw 4565  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4872  df-int 4911  df-iun 4957  df-iin 4958  df-br 5108  df-opab 5170  df-mpt 5189  df-id 5533  df-xp 5644  df-rel 5645  df-cnv 5646  df-co 5647  df-dm 5648  df-iota 6464  df-fun 6513  df-fn 6514  df-fv 6519  df-top 22781  df-cld 22906
This theorem is referenced by:  incld  22930  clscld  22934  cldmre  22965
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