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Theorem iuncld 21629
Description: A finite indexed union of closed sets is closed. (Contributed by Mario Carneiro, 19-Sep-2015.)
Hypothesis
Ref Expression
clscld.1 𝑋 = 𝐽
Assertion
Ref Expression
iuncld ((𝐽 ∈ Top ∧ 𝐴 ∈ Fin ∧ ∀𝑥𝐴 𝐵 ∈ (Clsd‘𝐽)) → 𝑥𝐴 𝐵 ∈ (Clsd‘𝐽))
Distinct variable groups:   𝑥,𝐽   𝑥,𝑋   𝑥,𝐴
Allowed substitution hint:   𝐵(𝑥)

Proof of Theorem iuncld
StepHypRef Expression
1 difin 4213 . . . 4 (𝑋 ∖ (𝑋 𝑥𝐴 (𝑋𝐵))) = (𝑋 𝑥𝐴 (𝑋𝐵))
2 iundif2 4969 . . . 4 𝑥𝐴 (𝑋 ∖ (𝑋𝐵)) = (𝑋 𝑥𝐴 (𝑋𝐵))
31, 2eqtr4i 2847 . . 3 (𝑋 ∖ (𝑋 𝑥𝐴 (𝑋𝐵))) = 𝑥𝐴 (𝑋 ∖ (𝑋𝐵))
4 clscld.1 . . . . . . . 8 𝑋 = 𝐽
54cldss 21613 . . . . . . 7 (𝐵 ∈ (Clsd‘𝐽) → 𝐵𝑋)
6 dfss4 4210 . . . . . . 7 (𝐵𝑋 ↔ (𝑋 ∖ (𝑋𝐵)) = 𝐵)
75, 6sylib 221 . . . . . 6 (𝐵 ∈ (Clsd‘𝐽) → (𝑋 ∖ (𝑋𝐵)) = 𝐵)
87ralimi 3148 . . . . 5 (∀𝑥𝐴 𝐵 ∈ (Clsd‘𝐽) → ∀𝑥𝐴 (𝑋 ∖ (𝑋𝐵)) = 𝐵)
983ad2ant3 1132 . . . 4 ((𝐽 ∈ Top ∧ 𝐴 ∈ Fin ∧ ∀𝑥𝐴 𝐵 ∈ (Clsd‘𝐽)) → ∀𝑥𝐴 (𝑋 ∖ (𝑋𝐵)) = 𝐵)
10 iuneq2 4911 . . . 4 (∀𝑥𝐴 (𝑋 ∖ (𝑋𝐵)) = 𝐵 𝑥𝐴 (𝑋 ∖ (𝑋𝐵)) = 𝑥𝐴 𝐵)
119, 10syl 17 . . 3 ((𝐽 ∈ Top ∧ 𝐴 ∈ Fin ∧ ∀𝑥𝐴 𝐵 ∈ (Clsd‘𝐽)) → 𝑥𝐴 (𝑋 ∖ (𝑋𝐵)) = 𝑥𝐴 𝐵)
123, 11syl5eq 2868 . 2 ((𝐽 ∈ Top ∧ 𝐴 ∈ Fin ∧ ∀𝑥𝐴 𝐵 ∈ (Clsd‘𝐽)) → (𝑋 ∖ (𝑋 𝑥𝐴 (𝑋𝐵))) = 𝑥𝐴 𝐵)
13 simp1 1133 . . 3 ((𝐽 ∈ Top ∧ 𝐴 ∈ Fin ∧ ∀𝑥𝐴 𝐵 ∈ (Clsd‘𝐽)) → 𝐽 ∈ Top)
144cldopn 21615 . . . . 5 (𝐵 ∈ (Clsd‘𝐽) → (𝑋𝐵) ∈ 𝐽)
1514ralimi 3148 . . . 4 (∀𝑥𝐴 𝐵 ∈ (Clsd‘𝐽) → ∀𝑥𝐴 (𝑋𝐵) ∈ 𝐽)
164riinopn 21492 . . . 4 ((𝐽 ∈ Top ∧ 𝐴 ∈ Fin ∧ ∀𝑥𝐴 (𝑋𝐵) ∈ 𝐽) → (𝑋 𝑥𝐴 (𝑋𝐵)) ∈ 𝐽)
1715, 16syl3an3 1162 . . 3 ((𝐽 ∈ Top ∧ 𝐴 ∈ Fin ∧ ∀𝑥𝐴 𝐵 ∈ (Clsd‘𝐽)) → (𝑋 𝑥𝐴 (𝑋𝐵)) ∈ 𝐽)
184opncld 21617 . . 3 ((𝐽 ∈ Top ∧ (𝑋 𝑥𝐴 (𝑋𝐵)) ∈ 𝐽) → (𝑋 ∖ (𝑋 𝑥𝐴 (𝑋𝐵))) ∈ (Clsd‘𝐽))
1913, 17, 18syl2anc 587 . 2 ((𝐽 ∈ Top ∧ 𝐴 ∈ Fin ∧ ∀𝑥𝐴 𝐵 ∈ (Clsd‘𝐽)) → (𝑋 ∖ (𝑋 𝑥𝐴 (𝑋𝐵))) ∈ (Clsd‘𝐽))
2012, 19eqeltrrd 2913 1 ((𝐽 ∈ Top ∧ 𝐴 ∈ Fin ∧ ∀𝑥𝐴 𝐵 ∈ (Clsd‘𝐽)) → 𝑥𝐴 𝐵 ∈ (Clsd‘𝐽))
Colors of variables: wff setvar class
Syntax hints:  wi 4  w3a 1084   = wceq 1538  wcel 2115  wral 3126  cdif 3907  cin 3909  wss 3910   cuni 4811   ciun 4892   ciin 4893  cfv 6328  Fincfn 8484  Topctop 21477  Clsdccld 21600
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 1912  ax-6 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2178  ax-ext 2793  ax-sep 5176  ax-nul 5183  ax-pow 5239  ax-pr 5303  ax-un 7436
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2071  df-mo 2623  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2892  df-nfc 2960  df-ne 3008  df-ral 3131  df-rex 3132  df-reu 3133  df-rab 3135  df-v 3473  df-sbc 3750  df-csb 3858  df-dif 3913  df-un 3915  df-in 3917  df-ss 3927  df-pss 3929  df-nul 4267  df-if 4441  df-pw 4514  df-sn 4541  df-pr 4543  df-tp 4545  df-op 4547  df-uni 4812  df-int 4850  df-iun 4894  df-iin 4895  df-br 5040  df-opab 5102  df-mpt 5120  df-tr 5146  df-id 5433  df-eprel 5438  df-po 5447  df-so 5448  df-fr 5487  df-we 5489  df-xp 5534  df-rel 5535  df-cnv 5536  df-co 5537  df-dm 5538  df-rn 5539  df-res 5540  df-ima 5541  df-pred 6121  df-ord 6167  df-on 6168  df-lim 6169  df-suc 6170  df-iota 6287  df-fun 6330  df-fn 6331  df-f 6332  df-f1 6333  df-fo 6334  df-f1o 6335  df-fv 6336  df-ov 7133  df-oprab 7134  df-mpo 7135  df-om 7556  df-1st 7664  df-2nd 7665  df-wrecs 7922  df-recs 7983  df-rdg 8021  df-1o 8077  df-oadd 8081  df-er 8264  df-en 8485  df-dom 8486  df-fin 8488  df-top 21478  df-cld 21603
This theorem is referenced by:  unicld  21630  t1ficld  21911  mblfinlem1  34980  mblfinlem2  34981
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