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Theorem clsneibex 44091
Description: If (pseudo-)closure and (pseudo-)neighborhood functions are related by the composite operator, 𝐻, then the base set exists. (Contributed by RP, 4-Jun-2021.)
Hypotheses
Ref Expression
clsneibex.d 𝐷 = (𝑃𝐵)
clsneibex.h 𝐻 = (𝐹𝐷)
clsneibex.r (𝜑𝐾𝐻𝑁)
Assertion
Ref Expression
clsneibex (𝜑𝐵 ∈ V)

Proof of Theorem clsneibex
StepHypRef Expression
1 clsneibex.h . . . . 5 𝐻 = (𝐹𝐷)
2 clsneibex.d . . . . . 6 𝐷 = (𝑃𝐵)
32coeq2i 5824 . . . . 5 (𝐹𝐷) = (𝐹 ∘ (𝑃𝐵))
41, 3eqtri 2752 . . . 4 𝐻 = (𝐹 ∘ (𝑃𝐵))
54a1i 11 . . 3 (𝜑𝐻 = (𝐹 ∘ (𝑃𝐵)))
6 clsneibex.r . . 3 (𝜑𝐾𝐻𝑁)
75, 6breqdi 5122 . 2 (𝜑𝐾(𝐹 ∘ (𝑃𝐵))𝑁)
8 brne0 5157 . 2 (𝐾(𝐹 ∘ (𝑃𝐵))𝑁 → (𝐹 ∘ (𝑃𝐵)) ≠ ∅)
9 fvprc 6850 . . . . . . . 8 𝐵 ∈ V → (𝑃𝐵) = ∅)
109rneqd 5902 . . . . . . 7 𝐵 ∈ V → ran (𝑃𝐵) = ran ∅)
11 rn0 5889 . . . . . . 7 ran ∅ = ∅
1210, 11eqtrdi 2780 . . . . . 6 𝐵 ∈ V → ran (𝑃𝐵) = ∅)
1312ineq2d 4183 . . . . 5 𝐵 ∈ V → (dom 𝐹 ∩ ran (𝑃𝐵)) = (dom 𝐹 ∩ ∅))
14 in0 4358 . . . . 5 (dom 𝐹 ∩ ∅) = ∅
1513, 14eqtrdi 2780 . . . 4 𝐵 ∈ V → (dom 𝐹 ∩ ran (𝑃𝐵)) = ∅)
1615coemptyd 14945 . . 3 𝐵 ∈ V → (𝐹 ∘ (𝑃𝐵)) = ∅)
1716necon1ai 2952 . 2 ((𝐹 ∘ (𝑃𝐵)) ≠ ∅ → 𝐵 ∈ V)
187, 8, 173syl 18 1 (𝜑𝐵 ∈ V)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4   = wceq 1540  wcel 2109  wne 2925  Vcvv 3447  cin 3913  c0 4296   class class class wbr 5107  dom cdm 5638  ran crn 5639  ccom 5642  cfv 6511
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-sep 5251  ax-nul 5261  ax-pr 5387
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-ne 2926  df-ral 3045  df-rex 3054  df-rab 3406  df-v 3449  df-dif 3917  df-un 3919  df-in 3921  df-ss 3931  df-nul 4297  df-if 4489  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4872  df-br 5108  df-opab 5170  df-xp 5644  df-rel 5645  df-cnv 5646  df-co 5647  df-dm 5648  df-rn 5649  df-res 5650  df-iota 6464  df-fv 6519
This theorem is referenced by:  clsneircomplex  44092  clsneif1o  44093  clsneicnv  44094  clsneikex  44095  clsneinex  44096  clsneiel1  44097
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