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Theorem sscls 23407
Description: A subset of a topology's underlying set is included in its closure. (Contributed by NM, 22-Feb-2007.)
Hypothesis
Ref Expression
clscld.1 𝑋 = ∪ 𝐽
Assertion
Ref Expression
sscls ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → 𝑆 ⊆ ((cls‘𝐽)‘𝑆))

Proof of Theorem sscls
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 ssintub 4929 . 2 𝑆 ⊆ ∩ {𝑥 ∈ (Clsd‘𝐽) ∣ 𝑆 ⊆ 𝑥}
2 clscld.1 . . 3 𝑋 = ∪ 𝐽
32clsval 23388 . 2 ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → ((cls‘𝐽)‘𝑆) = ∩ {𝑥 ∈ (Clsd‘𝐽) ∣ 𝑆 ⊆ 𝑥})
41, 3sseqtrrid 3956 1 ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → 𝑆 ⊆ ((cls‘𝐽)‘𝑆))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1570   ∈ wcel 2147  {crab 3416   ⊆ wss 3900  ∪ cuni 4870  ∩ cint 4910  ‘cfv 6561  Topctop 23244  Clsdccld 23367  clsccl 23369
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 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-rep 5236  ax-sep 5253  ax-nul 5264  ax-pow 5332  ax-pr 5396
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 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-reu 3370  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-int 4911  df-iun 4956  df-br 5107  df-opab 5172  df-mpt 5191  df-id 5551  df-xp 5662  df-rel 5663  df-cnv 5664  df-co 5665  df-dm 5666  df-rn 5667  df-res 5668  df-ima 5669  df-iota 6515  df-fun 6563  df-fn 6564  df-f 6565  df-f1 6566  df-fo 6567  df-f1o 6568  df-fv 6569  df-top 23245  df-cld 23370  df-cls 23372
This theorem is used by:  iscld4  23416  elcls  23424  ntrcls0  23427  clslp  23499  restcls  23532  cncls2i  23621  nrmsep  23708  lpcls  23715  regsep2  23727  hauscmplem  23757  hauscmp  23758  clsconn  23781  conncompcld  23785  hausllycmp  23846  txcls  23956  ptclsg  23967  regr1lem  24091  kqreglem1  24093  kqreglem2  24094  kqnrmlem1  24095  kqnrmlem2  24096  fclscmpi  24381  flfcntr  24395  cnextfres  24421  clssubg  24461  tsmsid  24492  cnllycmp  25310  clsocv  25604  relcmpcmet  25672  bcthlem2  25679  bcthlem4  25681  limcnlp  26231  opnbnd  37304  opnregcld  37309  cldregopn  37310  heibor1lem  38946  heiborlem8  38955  sepdisj  50254  iscnrm3rlem4  50272
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