Metamath Proof Explorer < Previous   Next > Nearby theorems Mirrors  >  Home  >  MPE Home  >  Th. List  >  restcls Structured version   Visualization version   GIF version

Theorem restcls 20795
 Description: A closure in a subspace topology. (Contributed by Jeff Hankins, 22-Jan-2010.) (Revised by Mario Carneiro, 15-Dec-2013.)
Hypotheses
Ref Expression
restcls.1 𝑋 = 𝐽
restcls.2 𝐾 = (𝐽t 𝑌)
Assertion
Ref Expression
restcls ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → ((cls‘𝐾)‘𝑆) = (((cls‘𝐽)‘𝑆) ∩ 𝑌))

Proof of Theorem restcls
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 simp1 1054 . . . . . 6 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → 𝐽 ∈ Top)
2 sstr 3576 . . . . . . . 8 ((𝑆𝑌𝑌𝑋) → 𝑆𝑋)
32ancoms 468 . . . . . . 7 ((𝑌𝑋𝑆𝑌) → 𝑆𝑋)
433adant1 1072 . . . . . 6 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → 𝑆𝑋)
5 restcls.1 . . . . . . 7 𝑋 = 𝐽
65clscld 20661 . . . . . 6 ((𝐽 ∈ Top ∧ 𝑆𝑋) → ((cls‘𝐽)‘𝑆) ∈ (Clsd‘𝐽))
71, 4, 6syl2anc 691 . . . . 5 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → ((cls‘𝐽)‘𝑆) ∈ (Clsd‘𝐽))
8 eqid 2610 . . . . 5 (((cls‘𝐽)‘𝑆) ∩ 𝑌) = (((cls‘𝐽)‘𝑆) ∩ 𝑌)
9 ineq1 3769 . . . . . . 7 (𝑥 = ((cls‘𝐽)‘𝑆) → (𝑥𝑌) = (((cls‘𝐽)‘𝑆) ∩ 𝑌))
109eqeq2d 2620 . . . . . 6 (𝑥 = ((cls‘𝐽)‘𝑆) → ((((cls‘𝐽)‘𝑆) ∩ 𝑌) = (𝑥𝑌) ↔ (((cls‘𝐽)‘𝑆) ∩ 𝑌) = (((cls‘𝐽)‘𝑆) ∩ 𝑌)))
1110rspcev 3282 . . . . 5 ((((cls‘𝐽)‘𝑆) ∈ (Clsd‘𝐽) ∧ (((cls‘𝐽)‘𝑆) ∩ 𝑌) = (((cls‘𝐽)‘𝑆) ∩ 𝑌)) → ∃𝑥 ∈ (Clsd‘𝐽)(((cls‘𝐽)‘𝑆) ∩ 𝑌) = (𝑥𝑌))
127, 8, 11sylancl 693 . . . 4 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → ∃𝑥 ∈ (Clsd‘𝐽)(((cls‘𝐽)‘𝑆) ∩ 𝑌) = (𝑥𝑌))
13 restcls.2 . . . . . . 7 𝐾 = (𝐽t 𝑌)
1413fveq2i 6106 . . . . . 6 (Clsd‘𝐾) = (Clsd‘(𝐽t 𝑌))
1514eleq2i 2680 . . . . 5 ((((cls‘𝐽)‘𝑆) ∩ 𝑌) ∈ (Clsd‘𝐾) ↔ (((cls‘𝐽)‘𝑆) ∩ 𝑌) ∈ (Clsd‘(𝐽t 𝑌)))
165restcld 20786 . . . . . 6 ((𝐽 ∈ Top ∧ 𝑌𝑋) → ((((cls‘𝐽)‘𝑆) ∩ 𝑌) ∈ (Clsd‘(𝐽t 𝑌)) ↔ ∃𝑥 ∈ (Clsd‘𝐽)(((cls‘𝐽)‘𝑆) ∩ 𝑌) = (𝑥𝑌)))
17163adant3 1074 . . . . 5 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → ((((cls‘𝐽)‘𝑆) ∩ 𝑌) ∈ (Clsd‘(𝐽t 𝑌)) ↔ ∃𝑥 ∈ (Clsd‘𝐽)(((cls‘𝐽)‘𝑆) ∩ 𝑌) = (𝑥𝑌)))
1815, 17syl5bb 271 . . . 4 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → ((((cls‘𝐽)‘𝑆) ∩ 𝑌) ∈ (Clsd‘𝐾) ↔ ∃𝑥 ∈ (Clsd‘𝐽)(((cls‘𝐽)‘𝑆) ∩ 𝑌) = (𝑥𝑌)))
1912, 18mpbird 246 . . 3 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → (((cls‘𝐽)‘𝑆) ∩ 𝑌) ∈ (Clsd‘𝐾))
205sscls 20670 . . . . 5 ((𝐽 ∈ Top ∧ 𝑆𝑋) → 𝑆 ⊆ ((cls‘𝐽)‘𝑆))
211, 4, 20syl2anc 691 . . . 4 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → 𝑆 ⊆ ((cls‘𝐽)‘𝑆))
22 simp3 1056 . . . 4 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → 𝑆𝑌)
2321, 22ssind 3799 . . 3 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → 𝑆 ⊆ (((cls‘𝐽)‘𝑆) ∩ 𝑌))
24 eqid 2610 . . . 4 𝐾 = 𝐾
2524clsss2 20686 . . 3 (((((cls‘𝐽)‘𝑆) ∩ 𝑌) ∈ (Clsd‘𝐾) ∧ 𝑆 ⊆ (((cls‘𝐽)‘𝑆) ∩ 𝑌)) → ((cls‘𝐾)‘𝑆) ⊆ (((cls‘𝐽)‘𝑆) ∩ 𝑌))
2619, 23, 25syl2anc 691 . 2 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → ((cls‘𝐾)‘𝑆) ⊆ (((cls‘𝐽)‘𝑆) ∩ 𝑌))
2713fveq2i 6106 . . . . . 6 (cls‘𝐾) = (cls‘(𝐽t 𝑌))
2827fveq1i 6104 . . . . 5 ((cls‘𝐾)‘𝑆) = ((cls‘(𝐽t 𝑌))‘𝑆)
29 id 22 . . . . . . . . 9 (𝑌𝑋𝑌𝑋)
305topopn 20536 . . . . . . . . 9 (𝐽 ∈ Top → 𝑋𝐽)
31 ssexg 4732 . . . . . . . . 9 ((𝑌𝑋𝑋𝐽) → 𝑌 ∈ V)
3229, 30, 31syl2anr 494 . . . . . . . 8 ((𝐽 ∈ Top ∧ 𝑌𝑋) → 𝑌 ∈ V)
33 resttop 20774 . . . . . . . 8 ((𝐽 ∈ Top ∧ 𝑌 ∈ V) → (𝐽t 𝑌) ∈ Top)
3432, 33syldan 486 . . . . . . 7 ((𝐽 ∈ Top ∧ 𝑌𝑋) → (𝐽t 𝑌) ∈ Top)
35343adant3 1074 . . . . . 6 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → (𝐽t 𝑌) ∈ Top)
365restuni 20776 . . . . . . . 8 ((𝐽 ∈ Top ∧ 𝑌𝑋) → 𝑌 = (𝐽t 𝑌))
37363adant3 1074 . . . . . . 7 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → 𝑌 = (𝐽t 𝑌))
3822, 37sseqtrd 3604 . . . . . 6 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → 𝑆 (𝐽t 𝑌))
39 eqid 2610 . . . . . . 7 (𝐽t 𝑌) = (𝐽t 𝑌)
4039clscld 20661 . . . . . 6 (((𝐽t 𝑌) ∈ Top ∧ 𝑆 (𝐽t 𝑌)) → ((cls‘(𝐽t 𝑌))‘𝑆) ∈ (Clsd‘(𝐽t 𝑌)))
4135, 38, 40syl2anc 691 . . . . 5 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → ((cls‘(𝐽t 𝑌))‘𝑆) ∈ (Clsd‘(𝐽t 𝑌)))
4228, 41syl5eqel 2692 . . . 4 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → ((cls‘𝐾)‘𝑆) ∈ (Clsd‘(𝐽t 𝑌)))
435restcld 20786 . . . . 5 ((𝐽 ∈ Top ∧ 𝑌𝑋) → (((cls‘𝐾)‘𝑆) ∈ (Clsd‘(𝐽t 𝑌)) ↔ ∃𝑥 ∈ (Clsd‘𝐽)((cls‘𝐾)‘𝑆) = (𝑥𝑌)))
44433adant3 1074 . . . 4 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → (((cls‘𝐾)‘𝑆) ∈ (Clsd‘(𝐽t 𝑌)) ↔ ∃𝑥 ∈ (Clsd‘𝐽)((cls‘𝐾)‘𝑆) = (𝑥𝑌)))
4542, 44mpbid 221 . . 3 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → ∃𝑥 ∈ (Clsd‘𝐽)((cls‘𝐾)‘𝑆) = (𝑥𝑌))
4613, 34syl5eqel 2692 . . . . . . . 8 ((𝐽 ∈ Top ∧ 𝑌𝑋) → 𝐾 ∈ Top)
47463adant3 1074 . . . . . . 7 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → 𝐾 ∈ Top)
4813unieqi 4381 . . . . . . . . 9 𝐾 = (𝐽t 𝑌)
4948eqcomi 2619 . . . . . . . 8 (𝐽t 𝑌) = 𝐾
5049sscls 20670 . . . . . . 7 ((𝐾 ∈ Top ∧ 𝑆 (𝐽t 𝑌)) → 𝑆 ⊆ ((cls‘𝐾)‘𝑆))
5147, 38, 50syl2anc 691 . . . . . 6 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → 𝑆 ⊆ ((cls‘𝐾)‘𝑆))
5251adantr 480 . . . . 5 (((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) ∧ (𝑥 ∈ (Clsd‘𝐽) ∧ ((cls‘𝐾)‘𝑆) = (𝑥𝑌))) → 𝑆 ⊆ ((cls‘𝐾)‘𝑆))
53 inss1 3795 . . . . . . 7 (𝑥𝑌) ⊆ 𝑥
54 sseq1 3589 . . . . . . 7 (((cls‘𝐾)‘𝑆) = (𝑥𝑌) → (((cls‘𝐾)‘𝑆) ⊆ 𝑥 ↔ (𝑥𝑌) ⊆ 𝑥))
5553, 54mpbiri 247 . . . . . 6 (((cls‘𝐾)‘𝑆) = (𝑥𝑌) → ((cls‘𝐾)‘𝑆) ⊆ 𝑥)
5655ad2antll 761 . . . . 5 (((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) ∧ (𝑥 ∈ (Clsd‘𝐽) ∧ ((cls‘𝐾)‘𝑆) = (𝑥𝑌))) → ((cls‘𝐾)‘𝑆) ⊆ 𝑥)
5752, 56sstrd 3578 . . . 4 (((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) ∧ (𝑥 ∈ (Clsd‘𝐽) ∧ ((cls‘𝐾)‘𝑆) = (𝑥𝑌))) → 𝑆𝑥)
585clsss2 20686 . . . . . . . . . 10 ((𝑥 ∈ (Clsd‘𝐽) ∧ 𝑆𝑥) → ((cls‘𝐽)‘𝑆) ⊆ 𝑥)
5958adantl 481 . . . . . . . . 9 (((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) ∧ (𝑥 ∈ (Clsd‘𝐽) ∧ 𝑆𝑥)) → ((cls‘𝐽)‘𝑆) ⊆ 𝑥)
60 ssrin 3800 . . . . . . . . 9 (((cls‘𝐽)‘𝑆) ⊆ 𝑥 → (((cls‘𝐽)‘𝑆) ∩ 𝑌) ⊆ (𝑥𝑌))
6159, 60syl 17 . . . . . . . 8 (((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) ∧ (𝑥 ∈ (Clsd‘𝐽) ∧ 𝑆𝑥)) → (((cls‘𝐽)‘𝑆) ∩ 𝑌) ⊆ (𝑥𝑌))
62 sseq2 3590 . . . . . . . 8 (((cls‘𝐾)‘𝑆) = (𝑥𝑌) → ((((cls‘𝐽)‘𝑆) ∩ 𝑌) ⊆ ((cls‘𝐾)‘𝑆) ↔ (((cls‘𝐽)‘𝑆) ∩ 𝑌) ⊆ (𝑥𝑌)))
6361, 62syl5ibrcom 236 . . . . . . 7 (((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) ∧ (𝑥 ∈ (Clsd‘𝐽) ∧ 𝑆𝑥)) → (((cls‘𝐾)‘𝑆) = (𝑥𝑌) → (((cls‘𝐽)‘𝑆) ∩ 𝑌) ⊆ ((cls‘𝐾)‘𝑆)))
6463expr 641 . . . . . 6 (((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) ∧ 𝑥 ∈ (Clsd‘𝐽)) → (𝑆𝑥 → (((cls‘𝐾)‘𝑆) = (𝑥𝑌) → (((cls‘𝐽)‘𝑆) ∩ 𝑌) ⊆ ((cls‘𝐾)‘𝑆))))
6564com23 84 . . . . 5 (((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) ∧ 𝑥 ∈ (Clsd‘𝐽)) → (((cls‘𝐾)‘𝑆) = (𝑥𝑌) → (𝑆𝑥 → (((cls‘𝐽)‘𝑆) ∩ 𝑌) ⊆ ((cls‘𝐾)‘𝑆))))
6665impr 647 . . . 4 (((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) ∧ (𝑥 ∈ (Clsd‘𝐽) ∧ ((cls‘𝐾)‘𝑆) = (𝑥𝑌))) → (𝑆𝑥 → (((cls‘𝐽)‘𝑆) ∩ 𝑌) ⊆ ((cls‘𝐾)‘𝑆)))
6757, 66mpd 15 . . 3 (((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) ∧ (𝑥 ∈ (Clsd‘𝐽) ∧ ((cls‘𝐾)‘𝑆) = (𝑥𝑌))) → (((cls‘𝐽)‘𝑆) ∩ 𝑌) ⊆ ((cls‘𝐾)‘𝑆))
6845, 67rexlimddv 3017 . 2 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → (((cls‘𝐽)‘𝑆) ∩ 𝑌) ⊆ ((cls‘𝐾)‘𝑆))
6926, 68eqssd 3585 1 ((𝐽 ∈ Top ∧ 𝑌𝑋𝑆𝑌) → ((cls‘𝐾)‘𝑆) = (((cls‘𝐽)‘𝑆) ∩ 𝑌))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977  ∃wrex 2897  Vcvv 3173   ∩ cin 3539   ⊆ wss 3540  ∪ cuni 4372  ‘cfv 5804  (class class class)co 6549   ↾t crest 15904  Topctop 20517  Clsdccld 20630  clsccl 20632 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-iin 4458  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-oadd 7451  df-er 7629  df-en 7842  df-fin 7845  df-fi 8200  df-rest 15906  df-topgen 15927  df-top 20521  df-bases 20522  df-topon 20523  df-cld 20633  df-cls 20635 This theorem is referenced by:  restlp  20797  resscdrg  22962
 Copyright terms: Public domain W3C validator