Theorem sscls 21800

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 4851	. 2 ⊢ 𝑆 ⊆ ∩ {𝑥 ∈ (Clsd‘𝐽) ∣ 𝑆 ⊆ 𝑥}
2		clscld.1	. . 3 ⊢ 𝑋 = ∪ 𝐽
3	2	clsval 21781	. 2 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → ((cls‘𝐽)‘𝑆) = ∩ {𝑥 ∈ (Clsd‘𝐽) ∣ 𝑆 ⊆ 𝑥})
4	1, 3	sseqtrrid 3928	1 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → 𝑆 ⊆ ((cls‘𝐽)‘𝑆))

Syntax hints:   → wi 4   ∧ wa 399   = wceq 1542   ∈ wcel 2113  {crab 3057   ⊆ wss 3841  ∪ cuni 4793  ∩ cint 4833  ‘cfv 6333  Topctop 21637  Clsdccld 21760  clsccl 21762

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1916  ax-6 1974  ax-7 2019  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2161  ax-12 2178  ax-ext 2710  ax-rep 5151  ax-sep 5164  ax-nul 5171  ax-pow 5229  ax-pr 5293

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2074  df-mo 2540  df-eu 2570  df-clab 2717  df-cleq 2730  df-clel 2811  df-nfc 2881  df-ne 2935  df-ral 3058  df-rex 3059  df-reu 3060  df-rab 3062  df-v 3399  df-sbc 3680  df-csb 3789  df-dif 3844  df-un 3846  df-in 3848  df-ss 3858  df-nul 4210  df-if 4412  df-pw 4487  df-sn 4514  df-pr 4516  df-op 4520  df-uni 4794  df-int 4834  df-iun 4880  df-br 5028  df-opab 5090  df-mpt 5108  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 6291  df-fun 6335  df-fn 6336  df-f 6337  df-f1 6338  df-fo 6339  df-f1o 6340  df-fv 6341  df-top 21638  df-cld 21763  df-cls 21765

This theorem is referenced by:  iscld4  21809  elcls  21817  ntrcls0  21820  clslp  21892  restcls  21925  cncls2i  22014  nrmsep  22101  lpcls  22108  regsep2  22120  hauscmplem  22150  hauscmp  22151  clsconn  22174  conncompcld  22178  hausllycmp  22238  txcls  22348  ptclsg  22359  regr1lem  22483  kqreglem1  22485  kqreglem2  22486  kqnrmlem1  22487  kqnrmlem2  22488  fclscmpi  22773  flfcntr  22787  cnextfres  22813  clssubg  22853  tsmsid  22884  cnllycmp  23701  clsocv  23995  relcmpcmet  24063  bcthlem2  24070  bcthlem4  24072  limcnlp  24622  opnbnd  34144  opnregcld  34149  cldregopn  34150  heibor1lem  35579  heiborlem8  35588  sepdisj  45724  iscnrm3rlem4  45743