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Theorem mreiincl 16303
Description: A nonempty indexed intersection of closed sets is closed. (Contributed by Stefan O'Rear, 1-Feb-2015.)
Assertion
Ref Expression
mreiincl ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐼 ≠ ∅ ∧ ∀𝑦𝐼 𝑆𝐶) → 𝑦𝐼 𝑆𝐶)
Distinct variable groups:   𝑦,𝐼   𝑦,𝑋   𝑦,𝐶
Allowed substitution hint:   𝑆(𝑦)

Proof of Theorem mreiincl
Dummy variable 𝑠 is distinct from all other variables.
StepHypRef Expression
1 dfiin2g 4585 . . 3 (∀𝑦𝐼 𝑆𝐶 𝑦𝐼 𝑆 = {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆})
213ad2ant3 1104 . 2 ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐼 ≠ ∅ ∧ ∀𝑦𝐼 𝑆𝐶) → 𝑦𝐼 𝑆 = {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆})
3 simp1 1081 . . 3 ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐼 ≠ ∅ ∧ ∀𝑦𝐼 𝑆𝐶) → 𝐶 ∈ (Moore‘𝑋))
4 uniiunlem 3724 . . . . 5 (∀𝑦𝐼 𝑆𝐶 → (∀𝑦𝐼 𝑆𝐶 ↔ {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ⊆ 𝐶))
54ibi 256 . . . 4 (∀𝑦𝐼 𝑆𝐶 → {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ⊆ 𝐶)
653ad2ant3 1104 . . 3 ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐼 ≠ ∅ ∧ ∀𝑦𝐼 𝑆𝐶) → {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ⊆ 𝐶)
7 n0 3964 . . . . . 6 (𝐼 ≠ ∅ ↔ ∃𝑦 𝑦𝐼)
8 nfra1 2970 . . . . . . . 8 𝑦𝑦𝐼 𝑆𝐶
9 nfre1 3034 . . . . . . . . . 10 𝑦𝑦𝐼 𝑠 = 𝑆
109nfab 2798 . . . . . . . . 9 𝑦{𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆}
11 nfcv 2793 . . . . . . . . 9 𝑦
1210, 11nfne 2923 . . . . . . . 8 𝑦{𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ≠ ∅
138, 12nfim 1865 . . . . . . 7 𝑦(∀𝑦𝐼 𝑆𝐶 → {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ≠ ∅)
14 rsp 2958 . . . . . . . . . 10 (∀𝑦𝐼 𝑆𝐶 → (𝑦𝐼𝑆𝐶))
1514com12 32 . . . . . . . . 9 (𝑦𝐼 → (∀𝑦𝐼 𝑆𝐶𝑆𝐶))
16 elisset 3246 . . . . . . . . . . 11 (𝑆𝐶 → ∃𝑠 𝑠 = 𝑆)
17 rspe 3032 . . . . . . . . . . . 12 ((𝑦𝐼 ∧ ∃𝑠 𝑠 = 𝑆) → ∃𝑦𝐼𝑠 𝑠 = 𝑆)
1817ex 449 . . . . . . . . . . 11 (𝑦𝐼 → (∃𝑠 𝑠 = 𝑆 → ∃𝑦𝐼𝑠 𝑠 = 𝑆))
1916, 18syl5 34 . . . . . . . . . 10 (𝑦𝐼 → (𝑆𝐶 → ∃𝑦𝐼𝑠 𝑠 = 𝑆))
20 rexcom4 3256 . . . . . . . . . 10 (∃𝑦𝐼𝑠 𝑠 = 𝑆 ↔ ∃𝑠𝑦𝐼 𝑠 = 𝑆)
2119, 20syl6ib 241 . . . . . . . . 9 (𝑦𝐼 → (𝑆𝐶 → ∃𝑠𝑦𝐼 𝑠 = 𝑆))
2215, 21syld 47 . . . . . . . 8 (𝑦𝐼 → (∀𝑦𝐼 𝑆𝐶 → ∃𝑠𝑦𝐼 𝑠 = 𝑆))
23 abn0 3987 . . . . . . . 8 ({𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ≠ ∅ ↔ ∃𝑠𝑦𝐼 𝑠 = 𝑆)
2422, 23syl6ibr 242 . . . . . . 7 (𝑦𝐼 → (∀𝑦𝐼 𝑆𝐶 → {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ≠ ∅))
2513, 24exlimi 2124 . . . . . 6 (∃𝑦 𝑦𝐼 → (∀𝑦𝐼 𝑆𝐶 → {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ≠ ∅))
267, 25sylbi 207 . . . . 5 (𝐼 ≠ ∅ → (∀𝑦𝐼 𝑆𝐶 → {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ≠ ∅))
2726imp 444 . . . 4 ((𝐼 ≠ ∅ ∧ ∀𝑦𝐼 𝑆𝐶) → {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ≠ ∅)
28273adant1 1099 . . 3 ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐼 ≠ ∅ ∧ ∀𝑦𝐼 𝑆𝐶) → {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ≠ ∅)
29 mreintcl 16302 . . 3 ((𝐶 ∈ (Moore‘𝑋) ∧ {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ⊆ 𝐶 ∧ {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ≠ ∅) → {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ∈ 𝐶)
303, 6, 28, 29syl3anc 1366 . 2 ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐼 ≠ ∅ ∧ ∀𝑦𝐼 𝑆𝐶) → {𝑠 ∣ ∃𝑦𝐼 𝑠 = 𝑆} ∈ 𝐶)
312, 30eqeltrd 2730 1 ((𝐶 ∈ (Moore‘𝑋) ∧ 𝐼 ≠ ∅ ∧ ∀𝑦𝐼 𝑆𝐶) → 𝑦𝐼 𝑆𝐶)
Colors of variables: wff setvar class
Syntax hints:  wi 4  w3a 1054   = wceq 1523  wex 1744  wcel 2030  {cab 2637  wne 2823  wral 2941  wrex 2942  wss 3607  c0 3948   cint 4507   ciin 4553  cfv 5926  Moorecmre 16289
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-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936
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-rab 2950  df-v 3233  df-sbc 3469  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-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-iota 5889  df-fun 5928  df-fv 5934  df-mre 16293
This theorem is referenced by:  mreriincl  16305  mretopd  20944
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