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Theorem kur14lem6 31319
Description: Lemma for kur14 31324. If 𝑘 is the complementation operator and 𝑘 is the closure operator, this expresses the identity 𝑘𝑐𝑘𝐴 = 𝑘𝑐𝑘𝑐𝑘𝑐𝑘𝐴 for any subset 𝐴 of the topological space. This is the key result that lets us cut down long enough sequences of 𝑐𝑘𝑐𝑘... that arise when applying closure and complement repeatedly to 𝐴, and explains why we end up with a number as large as 14, yet no larger. (Contributed by Mario Carneiro, 11-Feb-2015.)
Hypotheses
Ref Expression
kur14lem.j 𝐽 ∈ Top
kur14lem.x 𝑋 = 𝐽
kur14lem.k 𝐾 = (cls‘𝐽)
kur14lem.i 𝐼 = (int‘𝐽)
kur14lem.a 𝐴𝑋
kur14lem.b 𝐵 = (𝑋 ∖ (𝐾𝐴))
Assertion
Ref Expression
kur14lem6 (𝐾‘(𝐼‘(𝐾𝐵))) = (𝐾𝐵)

Proof of Theorem kur14lem6
StepHypRef Expression
1 kur14lem.j . . . . 5 𝐽 ∈ Top
2 kur14lem.x . . . . . 6 𝑋 = 𝐽
3 kur14lem.k . . . . . 6 𝐾 = (cls‘𝐽)
4 kur14lem.i . . . . . 6 𝐼 = (int‘𝐽)
5 kur14lem.b . . . . . . 7 𝐵 = (𝑋 ∖ (𝐾𝐴))
6 difss 3770 . . . . . . 7 (𝑋 ∖ (𝐾𝐴)) ⊆ 𝑋
75, 6eqsstri 3668 . . . . . 6 𝐵𝑋
81, 2, 3, 4, 7kur14lem3 31316 . . . . 5 (𝐾𝐵) ⊆ 𝑋
94fveq1i 6230 . . . . . 6 (𝐼‘(𝐾𝐵)) = ((int‘𝐽)‘(𝐾𝐵))
102ntrss2 20909 . . . . . . 7 ((𝐽 ∈ Top ∧ (𝐾𝐵) ⊆ 𝑋) → ((int‘𝐽)‘(𝐾𝐵)) ⊆ (𝐾𝐵))
111, 8, 10mp2an 708 . . . . . 6 ((int‘𝐽)‘(𝐾𝐵)) ⊆ (𝐾𝐵)
129, 11eqsstri 3668 . . . . 5 (𝐼‘(𝐾𝐵)) ⊆ (𝐾𝐵)
132clsss 20906 . . . . 5 ((𝐽 ∈ Top ∧ (𝐾𝐵) ⊆ 𝑋 ∧ (𝐼‘(𝐾𝐵)) ⊆ (𝐾𝐵)) → ((cls‘𝐽)‘(𝐼‘(𝐾𝐵))) ⊆ ((cls‘𝐽)‘(𝐾𝐵)))
141, 8, 12, 13mp3an 1464 . . . 4 ((cls‘𝐽)‘(𝐼‘(𝐾𝐵))) ⊆ ((cls‘𝐽)‘(𝐾𝐵))
153fveq1i 6230 . . . 4 (𝐾‘(𝐼‘(𝐾𝐵))) = ((cls‘𝐽)‘(𝐼‘(𝐾𝐵)))
163fveq1i 6230 . . . 4 (𝐾‘(𝐾𝐵)) = ((cls‘𝐽)‘(𝐾𝐵))
1714, 15, 163sstr4i 3677 . . 3 (𝐾‘(𝐼‘(𝐾𝐵))) ⊆ (𝐾‘(𝐾𝐵))
181, 2, 3, 4, 7kur14lem5 31318 . . 3 (𝐾‘(𝐾𝐵)) = (𝐾𝐵)
1917, 18sseqtri 3670 . 2 (𝐾‘(𝐼‘(𝐾𝐵))) ⊆ (𝐾𝐵)
201, 2, 3, 4, 8kur14lem2 31315 . . . . 5 (𝐼‘(𝐾𝐵)) = (𝑋 ∖ (𝐾‘(𝑋 ∖ (𝐾𝐵))))
21 difss 3770 . . . . 5 (𝑋 ∖ (𝐾‘(𝑋 ∖ (𝐾𝐵)))) ⊆ 𝑋
2220, 21eqsstri 3668 . . . 4 (𝐼‘(𝐾𝐵)) ⊆ 𝑋
23 kur14lem.a . . . . . . . . 9 𝐴𝑋
241, 2, 3, 4, 23kur14lem3 31316 . . . . . . . 8 (𝐾𝐴) ⊆ 𝑋
255fveq2i 6232 . . . . . . . . . . 11 (𝐾𝐵) = (𝐾‘(𝑋 ∖ (𝐾𝐴)))
2625difeq2i 3758 . . . . . . . . . 10 (𝑋 ∖ (𝐾𝐵)) = (𝑋 ∖ (𝐾‘(𝑋 ∖ (𝐾𝐴))))
271, 2, 3, 4, 24kur14lem2 31315 . . . . . . . . . 10 (𝐼‘(𝐾𝐴)) = (𝑋 ∖ (𝐾‘(𝑋 ∖ (𝐾𝐴))))
284fveq1i 6230 . . . . . . . . . 10 (𝐼‘(𝐾𝐴)) = ((int‘𝐽)‘(𝐾𝐴))
2926, 27, 283eqtr2i 2679 . . . . . . . . 9 (𝑋 ∖ (𝐾𝐵)) = ((int‘𝐽)‘(𝐾𝐴))
302ntrss2 20909 . . . . . . . . . 10 ((𝐽 ∈ Top ∧ (𝐾𝐴) ⊆ 𝑋) → ((int‘𝐽)‘(𝐾𝐴)) ⊆ (𝐾𝐴))
311, 24, 30mp2an 708 . . . . . . . . 9 ((int‘𝐽)‘(𝐾𝐴)) ⊆ (𝐾𝐴)
3229, 31eqsstri 3668 . . . . . . . 8 (𝑋 ∖ (𝐾𝐵)) ⊆ (𝐾𝐴)
332clsss 20906 . . . . . . . 8 ((𝐽 ∈ Top ∧ (𝐾𝐴) ⊆ 𝑋 ∧ (𝑋 ∖ (𝐾𝐵)) ⊆ (𝐾𝐴)) → ((cls‘𝐽)‘(𝑋 ∖ (𝐾𝐵))) ⊆ ((cls‘𝐽)‘(𝐾𝐴)))
341, 24, 32, 33mp3an 1464 . . . . . . 7 ((cls‘𝐽)‘(𝑋 ∖ (𝐾𝐵))) ⊆ ((cls‘𝐽)‘(𝐾𝐴))
353fveq1i 6230 . . . . . . 7 (𝐾‘(𝑋 ∖ (𝐾𝐵))) = ((cls‘𝐽)‘(𝑋 ∖ (𝐾𝐵)))
361, 2, 3, 4, 23kur14lem5 31318 . . . . . . . 8 (𝐾‘(𝐾𝐴)) = (𝐾𝐴)
373fveq1i 6230 . . . . . . . 8 (𝐾‘(𝐾𝐴)) = ((cls‘𝐽)‘(𝐾𝐴))
3836, 37eqtr3i 2675 . . . . . . 7 (𝐾𝐴) = ((cls‘𝐽)‘(𝐾𝐴))
3934, 35, 383sstr4i 3677 . . . . . 6 (𝐾‘(𝑋 ∖ (𝐾𝐵))) ⊆ (𝐾𝐴)
40 sscon 3777 . . . . . 6 ((𝐾‘(𝑋 ∖ (𝐾𝐵))) ⊆ (𝐾𝐴) → (𝑋 ∖ (𝐾𝐴)) ⊆ (𝑋 ∖ (𝐾‘(𝑋 ∖ (𝐾𝐵)))))
4139, 40ax-mp 5 . . . . 5 (𝑋 ∖ (𝐾𝐴)) ⊆ (𝑋 ∖ (𝐾‘(𝑋 ∖ (𝐾𝐵))))
4241, 5, 203sstr4i 3677 . . . 4 𝐵 ⊆ (𝐼‘(𝐾𝐵))
432clsss 20906 . . . 4 ((𝐽 ∈ Top ∧ (𝐼‘(𝐾𝐵)) ⊆ 𝑋𝐵 ⊆ (𝐼‘(𝐾𝐵))) → ((cls‘𝐽)‘𝐵) ⊆ ((cls‘𝐽)‘(𝐼‘(𝐾𝐵))))
441, 22, 42, 43mp3an 1464 . . 3 ((cls‘𝐽)‘𝐵) ⊆ ((cls‘𝐽)‘(𝐼‘(𝐾𝐵)))
453fveq1i 6230 . . 3 (𝐾𝐵) = ((cls‘𝐽)‘𝐵)
4644, 45, 153sstr4i 3677 . 2 (𝐾𝐵) ⊆ (𝐾‘(𝐼‘(𝐾𝐵)))
4719, 46eqssi 3652 1 (𝐾‘(𝐼‘(𝐾𝐵))) = (𝐾𝐵)
Colors of variables: wff setvar class
Syntax hints:   = wceq 1523  wcel 2030  cdif 3604  wss 3607   cuni 4468  cfv 5926  Topctop 20746  intcnt 20869  clsccl 20870
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-reu 2948  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-int 4508  df-iun 4554  df-iin 4555  df-br 4686  df-opab 4746  df-mpt 4763  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-top 20747  df-cld 20871  df-ntr 20872  df-cls 20873
This theorem is referenced by:  kur14lem7  31320
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