Theorem sscls 21661

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.

Step	Hyp	Ref	Expression
1		ssintub 4856	. 2 ⊢ 𝑆 ⊆ ∩ {𝑥 ∈ (Clsd‘𝐽) ∣ 𝑆 ⊆ 𝑥}
2		clscld.1	. . 3 ⊢ 𝑋 = ∪ 𝐽
3	2	clsval 21642	. 2 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → ((cls‘𝐽)‘𝑆) = ∩ {𝑥 ∈ (Clsd‘𝐽) ∣ 𝑆 ⊆ 𝑥})
4	1, 3	sseqtrrid 3968	1 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → 𝑆 ⊆ ((cls‘𝐽)‘𝑆))

Syntax hints:   → wi 4   ∧ wa 399   = wceq 1538   ∈ wcel 2111  {crab 3110   ⊆ wss 3881  ∪ cuni 4800  ∩ cint 4838  ‘cfv 6324  Topctop 21498  Clsdccld 21621  clsccl 21623

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 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-rep 5154  ax-sep 5167  ax-nul 5174  ax-pow 5231  ax-pr 5295

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ne 2988  df-ral 3111  df-rex 3112  df-reu 3113  df-rab 3115  df-v 3443  df-sbc 3721  df-csb 3829  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-nul 4244  df-if 4426  df-pw 4499  df-sn 4526  df-pr 4528  df-op 4532  df-uni 4801  df-int 4839  df-iun 4883  df-br 5031  df-opab 5093  df-mpt 5111  df-id 5425  df-xp 5525  df-rel 5526  df-cnv 5527  df-co 5528  df-dm 5529  df-rn 5530  df-res 5531  df-ima 5532  df-iota 6283  df-fun 6326  df-fn 6327  df-f 6328  df-f1 6329  df-fo 6330  df-f1o 6331  df-fv 6332  df-top 21499  df-cld 21624  df-cls 21626

This theorem is referenced by:  iscld4  21670  elcls  21678  ntrcls0  21681  clslp  21753  restcls  21786  cncls2i  21875  nrmsep  21962  lpcls  21969  regsep2  21981  hauscmplem  22011  hauscmp  22012  clsconn  22035  conncompcld  22039  hausllycmp  22099  txcls  22209  ptclsg  22220  regr1lem  22344  kqreglem1  22346  kqreglem2  22347  kqnrmlem1  22348  kqnrmlem2  22349  fclscmpi  22634  flfcntr  22648  cnextfres  22674  clssubg  22714  tsmsid  22745  cnllycmp  23561  clsocv  23854  relcmpcmet  23922  bcthlem2  23929  bcthlem4  23931  limcnlp  24481  opnbnd  33786  opnregcld  33791  cldregopn  33792  heibor1lem  35247  heiborlem8  35256