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Theorem clsneibex 45061
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 = (𝑃‘𝐵)
clsneibex.h 𝐻 = (𝐹 ∘ 𝐷)
clsneibex.r (𝜑 → 𝐾𝐻𝑁)
Assertion
Ref Expression
clsneibex (𝜑 → 𝐵 ∈ V)

Proof of Theorem clsneibex
StepHypRef Expression
1 clsneibex.h . . . . 5 𝐻 = (𝐹 ∘ 𝐷)
2 clsneibex.d . . . . . 6 𝐷 = (𝑃‘𝐵)
32coeq2i 5838 . . . . 5 (𝐹 ∘ 𝐷) = (𝐹 ∘ (𝑃‘𝐵))
41, 3eqtri 2784 . . . 4 𝐻 = (𝐹 ∘ (𝑃‘𝐵))
54a1i 11 . . 3 (𝜑 → 𝐻 = (𝐹 ∘ (𝑃‘𝐵)))
6 clsneibex.r . . 3 (𝜑 → 𝐾𝐻𝑁)
75, 6breqdi 5118 . 2 (𝜑 → 𝐾(𝐹 ∘ (𝑃‘𝐵))𝑁)
8 brne0 5155 . 2 (𝐾(𝐹 ∘ (𝑃‘𝐵))𝑁 → (𝐹 ∘ (𝑃‘𝐵)) ≠ ∅)
9 fvprc 6869 . . . . . . . 8 (¬ 𝐵 ∈ V → (𝑃‘𝐵) = ∅)
109rneqd 5920 . . . . . . 7 (¬ 𝐵 ∈ V → ran (𝑃‘𝐵) = ran ∅)
11 rn0 5908 . . . . . . 7 ran ∅ = ∅
1210, 11eqtrdi 2812 . . . . . 6 (¬ 𝐵 ∈ V → ran (𝑃‘𝐵) = ∅)
1312ineq2d 4166 . . . . 5 (¬ 𝐵 ∈ V → (dom 𝐹 ∩ ran (𝑃‘𝐵)) = (dom 𝐹 ∩ ∅))
14 in0 4345 . . . . 5 (dom 𝐹 ∩ ∅) = ∅
1513, 14eqtrdi 2812 . . . 4 (¬ 𝐵 ∈ V → (dom 𝐹 ∩ ran (𝑃‘𝐵)) = ∅)
1615coemptyd 15112 . . 3 (¬ 𝐵 ∈ V → (𝐹 ∘ (𝑃‘𝐵)) = ∅)
1716necon1ai 2983 . 2 ((𝐹 ∘ (𝑃‘𝐵)) ≠ ∅ → 𝐵 ∈ V)
187, 8, 173syl 19 1 (𝜑 → 𝐵 ∈ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3   → wi 4   = wceq 1570   ∈ wcel 2145   ≠ wne 2956  Vcvv 3451   ∩ cin 3898  ∅c0 4279   class class class wbr 5103  dom cdm 5651  ran crn 5652   ∘ ccom 5655  ‘cfv 6531
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2733  ax-sep 5249  ax-nul 5260  ax-pr 5391
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-ne 2957  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-iota 6487  df-fv 6539
This theorem is used by:  clsneircomplex  45062  clsneif1o  45063  clsneicnv  45064  clsneikex  45065  clsneinex  45066  clsneiel1  45067
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