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Theorem intcld 22304
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 5017 . 2 𝐴 = 𝑥𝐴 𝑥
2 dfss3 3930 . . 3 (𝐴 ⊆ (Clsd‘𝐽) ↔ ∀𝑥𝐴 𝑥 ∈ (Clsd‘𝐽))
3 iincld 22303 . . 3 ((𝐴 ≠ ∅ ∧ ∀𝑥𝐴 𝑥 ∈ (Clsd‘𝐽)) → 𝑥𝐴 𝑥 ∈ (Clsd‘𝐽))
42, 3sylan2b 595 . 2 ((𝐴 ≠ ∅ ∧ 𝐴 ⊆ (Clsd‘𝐽)) → 𝑥𝐴 𝑥 ∈ (Clsd‘𝐽))
51, 4eqeltrid 2842 1 ((𝐴 ≠ ∅ ∧ 𝐴 ⊆ (Clsd‘𝐽)) → 𝐴 ∈ (Clsd‘𝐽))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 397  wcel 2106  wne 2941  wral 3062  wss 3908  c0 4280   cint 4905   ciin 4953  cfv 6491  Clsdccld 22280
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2708  ax-sep 5254  ax-nul 5261  ax-pow 5318  ax-pr 5382  ax-un 7662
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2729  df-clel 2815  df-nfc 2887  df-ne 2942  df-ral 3063  df-rex 3072  df-rab 3406  df-v 3445  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-nul 4281  df-if 4485  df-pw 4560  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4864  df-int 4906  df-iun 4954  df-iin 4955  df-br 5104  df-opab 5166  df-mpt 5187  df-id 5528  df-xp 5636  df-rel 5637  df-cnv 5638  df-co 5639  df-dm 5640  df-iota 6443  df-fun 6493  df-fn 6494  df-fv 6499  df-top 22156  df-cld 22283
This theorem is referenced by:  incld  22307  clscld  22311  cldmre  22342
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