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Theorem cnclima 22419
Description: A closed subset of the codomain of a continuous function has a closed preimage. (Contributed by NM, 15-Mar-2007.) (Revised by Mario Carneiro, 21-Aug-2015.)
Assertion
Ref Expression
cnclima ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝐴 ∈ (Clsd‘𝐾)) → (𝐹𝐴) ∈ (Clsd‘𝐽))

Proof of Theorem cnclima
StepHypRef Expression
1 eqid 2738 . . . . . 6 𝐽 = 𝐽
2 eqid 2738 . . . . . 6 𝐾 = 𝐾
31, 2cnf 22397 . . . . 5 (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐹: 𝐽 𝐾)
43adantr 481 . . . 4 ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝐴 ∈ (Clsd‘𝐾)) → 𝐹: 𝐽 𝐾)
5 ffun 6603 . . . . . 6 (𝐹: 𝐽 𝐾 → Fun 𝐹)
6 funcnvcnv 6501 . . . . . 6 (Fun 𝐹 → Fun 𝐹)
7 imadif 6518 . . . . . 6 (Fun 𝐹 → (𝐹 “ ( 𝐾𝐴)) = ((𝐹 𝐾) ∖ (𝐹𝐴)))
85, 6, 73syl 18 . . . . 5 (𝐹: 𝐽 𝐾 → (𝐹 “ ( 𝐾𝐴)) = ((𝐹 𝐾) ∖ (𝐹𝐴)))
9 fimacnv 6622 . . . . . 6 (𝐹: 𝐽 𝐾 → (𝐹 𝐾) = 𝐽)
109difeq1d 4056 . . . . 5 (𝐹: 𝐽 𝐾 → ((𝐹 𝐾) ∖ (𝐹𝐴)) = ( 𝐽 ∖ (𝐹𝐴)))
118, 10eqtr2d 2779 . . . 4 (𝐹: 𝐽 𝐾 → ( 𝐽 ∖ (𝐹𝐴)) = (𝐹 “ ( 𝐾𝐴)))
124, 11syl 17 . . 3 ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝐴 ∈ (Clsd‘𝐾)) → ( 𝐽 ∖ (𝐹𝐴)) = (𝐹 “ ( 𝐾𝐴)))
132cldopn 22182 . . . 4 (𝐴 ∈ (Clsd‘𝐾) → ( 𝐾𝐴) ∈ 𝐾)
14 cnima 22416 . . . 4 ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ ( 𝐾𝐴) ∈ 𝐾) → (𝐹 “ ( 𝐾𝐴)) ∈ 𝐽)
1513, 14sylan2 593 . . 3 ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝐴 ∈ (Clsd‘𝐾)) → (𝐹 “ ( 𝐾𝐴)) ∈ 𝐽)
1612, 15eqeltrd 2839 . 2 ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝐴 ∈ (Clsd‘𝐾)) → ( 𝐽 ∖ (𝐹𝐴)) ∈ 𝐽)
17 cntop1 22391 . . 3 (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐽 ∈ Top)
18 cnvimass 5989 . . . 4 (𝐹𝐴) ⊆ dom 𝐹
1918, 4fssdm 6620 . . 3 ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝐴 ∈ (Clsd‘𝐾)) → (𝐹𝐴) ⊆ 𝐽)
201iscld2 22179 . . 3 ((𝐽 ∈ Top ∧ (𝐹𝐴) ⊆ 𝐽) → ((𝐹𝐴) ∈ (Clsd‘𝐽) ↔ ( 𝐽 ∖ (𝐹𝐴)) ∈ 𝐽))
2117, 19, 20syl2an2r 682 . 2 ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝐴 ∈ (Clsd‘𝐾)) → ((𝐹𝐴) ∈ (Clsd‘𝐽) ↔ ( 𝐽 ∖ (𝐹𝐴)) ∈ 𝐽))
2216, 21mpbird 256 1 ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝐴 ∈ (Clsd‘𝐾)) → (𝐹𝐴) ∈ (Clsd‘𝐽))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 396   = wceq 1539  wcel 2106  cdif 3884  wss 3887   cuni 4839  ccnv 5588  cima 5592  Fun wfun 6427  wf 6429  cfv 6433  (class class class)co 7275  Topctop 22042  Clsdccld 22167   Cn ccn 22375
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-sep 5223  ax-nul 5230  ax-pow 5288  ax-pr 5352  ax-un 7588
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ral 3069  df-rex 3070  df-rab 3073  df-v 3434  df-sbc 3717  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-nul 4257  df-if 4460  df-pw 4535  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-br 5075  df-opab 5137  df-mpt 5158  df-id 5489  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-iota 6391  df-fun 6435  df-fn 6436  df-f 6437  df-fv 6441  df-ov 7278  df-oprab 7279  df-mpo 7280  df-map 8617  df-top 22043  df-topon 22060  df-cld 22170  df-cn 22378
This theorem is referenced by:  iscncl  22420  cncls2i  22421  paste  22445  cnt1  22501  dnsconst  22529  cnconn  22573  hauseqlcld  22797  txconn  22840  imasncld  22842  r0cld  22889  kqreglem2  22893  kqnrmlem1  22894  kqnrmlem2  22895  hmeocld  22918  nrmhmph  22945  tgphaus  23268  csscld  24413  clsocv  24414  hmeoclda  34522  hmeocldb  34523  rfcnpre3  42576  rfcnpre4  42577  sepfsepc  46221  seppcld  46223
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