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Theorem ntrneibex 42906
Description: If (pseudo-)interior and (pseudo-)neighborhood functions are related by the operator, 𝐹, then the base set exists. (Contributed by RP, 29-May-2021.)
Hypotheses
Ref Expression
ntrnei.o 𝑂 = (𝑖 ∈ V, 𝑗 ∈ V ↦ (𝑘 ∈ (𝒫 𝑗m 𝑖) ↦ (𝑙𝑗 ↦ {𝑚𝑖𝑙 ∈ (𝑘𝑚)})))
ntrnei.f 𝐹 = (𝒫 𝐵𝑂𝐵)
ntrnei.r (𝜑𝐼𝐹𝑁)
Assertion
Ref Expression
ntrneibex (𝜑𝐵 ∈ V)
Distinct variable groups:   𝑖,𝑗,𝑘   𝑖,𝑙,𝑗   𝑖,𝑚,𝑗
Allowed substitution hints:   𝜑(𝑖,𝑗,𝑘,𝑚,𝑙)   𝐵(𝑖,𝑗,𝑘,𝑚,𝑙)   𝐹(𝑖,𝑗,𝑘,𝑚,𝑙)   𝐼(𝑖,𝑗,𝑘,𝑚,𝑙)   𝑁(𝑖,𝑗,𝑘,𝑚,𝑙)   𝑂(𝑖,𝑗,𝑘,𝑚,𝑙)

Proof of Theorem ntrneibex
Dummy variables 𝑏 𝑎 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ntrnei.o . . 3 𝑂 = (𝑖 ∈ V, 𝑗 ∈ V ↦ (𝑘 ∈ (𝒫 𝑗m 𝑖) ↦ (𝑙𝑗 ↦ {𝑚𝑖𝑙 ∈ (𝑘𝑚)})))
2 oveq2 7419 . . . . 5 (𝑖 = 𝑎 → (𝒫 𝑗m 𝑖) = (𝒫 𝑗m 𝑎))
3 rabeq 3446 . . . . . 6 (𝑖 = 𝑎 → {𝑚𝑖𝑙 ∈ (𝑘𝑚)} = {𝑚𝑎𝑙 ∈ (𝑘𝑚)})
43mpteq2dv 5250 . . . . 5 (𝑖 = 𝑎 → (𝑙𝑗 ↦ {𝑚𝑖𝑙 ∈ (𝑘𝑚)}) = (𝑙𝑗 ↦ {𝑚𝑎𝑙 ∈ (𝑘𝑚)}))
52, 4mpteq12dv 5239 . . . 4 (𝑖 = 𝑎 → (𝑘 ∈ (𝒫 𝑗m 𝑖) ↦ (𝑙𝑗 ↦ {𝑚𝑖𝑙 ∈ (𝑘𝑚)})) = (𝑘 ∈ (𝒫 𝑗m 𝑎) ↦ (𝑙𝑗 ↦ {𝑚𝑎𝑙 ∈ (𝑘𝑚)})))
6 pweq 4616 . . . . . 6 (𝑗 = 𝑏 → 𝒫 𝑗 = 𝒫 𝑏)
76oveq1d 7426 . . . . 5 (𝑗 = 𝑏 → (𝒫 𝑗m 𝑎) = (𝒫 𝑏m 𝑎))
8 mpteq1 5241 . . . . 5 (𝑗 = 𝑏 → (𝑙𝑗 ↦ {𝑚𝑎𝑙 ∈ (𝑘𝑚)}) = (𝑙𝑏 ↦ {𝑚𝑎𝑙 ∈ (𝑘𝑚)}))
97, 8mpteq12dv 5239 . . . 4 (𝑗 = 𝑏 → (𝑘 ∈ (𝒫 𝑗m 𝑎) ↦ (𝑙𝑗 ↦ {𝑚𝑎𝑙 ∈ (𝑘𝑚)})) = (𝑘 ∈ (𝒫 𝑏m 𝑎) ↦ (𝑙𝑏 ↦ {𝑚𝑎𝑙 ∈ (𝑘𝑚)})))
105, 9cbvmpov 7506 . . 3 (𝑖 ∈ V, 𝑗 ∈ V ↦ (𝑘 ∈ (𝒫 𝑗m 𝑖) ↦ (𝑙𝑗 ↦ {𝑚𝑖𝑙 ∈ (𝑘𝑚)}))) = (𝑎 ∈ V, 𝑏 ∈ V ↦ (𝑘 ∈ (𝒫 𝑏m 𝑎) ↦ (𝑙𝑏 ↦ {𝑚𝑎𝑙 ∈ (𝑘𝑚)})))
111, 10eqtri 2760 . 2 𝑂 = (𝑎 ∈ V, 𝑏 ∈ V ↦ (𝑘 ∈ (𝒫 𝑏m 𝑎) ↦ (𝑙𝑏 ↦ {𝑚𝑎𝑙 ∈ (𝑘𝑚)})))
12 ntrnei.r . 2 (𝜑𝐼𝐹𝑁)
13 ntrnei.f . . 3 𝐹 = (𝒫 𝐵𝑂𝐵)
1413a1i 11 . 2 (𝜑𝐹 = (𝒫 𝐵𝑂𝐵))
1511, 12, 14brovmptimex2 42862 1 (𝜑𝐵 ∈ V)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1541  wcel 2106  {crab 3432  Vcvv 3474  𝒫 cpw 4602   class class class wbr 5148  cmpt 5231  cfv 6543  (class class class)co 7411  cmpo 7413  m cmap 8822
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 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2703  ax-sep 5299  ax-nul 5306  ax-pr 5427
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2534  df-eu 2563  df-clab 2710  df-cleq 2724  df-clel 2810  df-nfc 2885  df-ne 2941  df-ral 3062  df-rex 3071  df-rab 3433  df-v 3476  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-nul 4323  df-if 4529  df-pw 4604  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-br 5149  df-opab 5211  df-mpt 5232  df-xp 5682  df-rel 5683  df-dm 5686  df-iota 6495  df-fv 6551  df-ov 7414  df-oprab 7415  df-mpo 7416
This theorem is referenced by:  ntrneircomplex  42907  ntrneif1o  42908  ntrneicnv  42911  ntrneiel  42914  ntrneicls00  42922  ntrneik3  42929  ntrneix3  42930  ntrneik13  42931  ntrneix13  42932
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