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Theorem sscls 23354
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 4926 . 2 𝑆 ⊆ ∩ {𝑥 ∈ (Clsd‘𝐽) ∣ 𝑆 ⊆ 𝑥}
2 clscld.1 . . 3 𝑋 = ∪ 𝐽
32clsval 23335 . 2 ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → ((cls‘𝐽)‘𝑆) = ∩ {𝑥 ∈ (Clsd‘𝐽) ∣ 𝑆 ⊆ 𝑥})
41, 3sseqtrrid 3974 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 2145  {crab 3413   ⊆ wss 3899  ∪ cuni 4867  ∩ cint 4907  ‘cfv 6531  Topctop 23191  Clsdccld 23314  clsccl 23316
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 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-rep 5232  ax-sep 5249  ax-nul 5260  ax-pow 5327  ax-pr 5391
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 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-reu 3367  df-rab 3414  df-v 3453  df-sbc 3740  df-csb 3848  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-int 4908  df-iun 4953  df-br 5104  df-opab 5168  df-mpt 5187  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-iota 6487  df-fun 6533  df-fn 6534  df-f 6535  df-f1 6536  df-fo 6537  df-f1o 6538  df-fv 6539  df-top 23192  df-cld 23317  df-cls 23319
This theorem is used by:  iscld4  23363  elcls  23371  ntrcls0  23374  clslp  23446  restcls  23479  cncls2i  23568  nrmsep  23655  lpcls  23662  regsep2  23674  hauscmplem  23704  hauscmp  23705  clsconn  23728  conncompcld  23732  hausllycmp  23793  txcls  23903  ptclsg  23914  regr1lem  24038  kqreglem1  24040  kqreglem2  24041  kqnrmlem1  24042  kqnrmlem2  24043  fclscmpi  24328  flfcntr  24342  cnextfres  24368  clssubg  24408  tsmsid  24439  cnllycmp  25257  clsocv  25551  relcmpcmet  25619  bcthlem2  25626  bcthlem4  25628  limcnlp  26178  opnbnd  37083  opnregcld  37088  cldregopn  37089  heibor1lem  38711  heiborlem8  38720  sepdisj  49977  iscnrm3rlem4  49995
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