Theorem clsneibex 44219

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

Step	Hyp	Ref	Expression
1		clsneibex.h	. . . . 5 ⊢ 𝐻 = (𝐹 ∘ 𝐷)
2		clsneibex.d	. . . . . 6 ⊢ 𝐷 = (𝑃‘𝐵)
3	2	coeq2i 5804	. . . . 5 ⊢ (𝐹 ∘ 𝐷) = (𝐹 ∘ (𝑃‘𝐵))
4	1, 3	eqtri 2756	. . . 4 ⊢ 𝐻 = (𝐹 ∘ (𝑃‘𝐵))
5	4	a1i 11	. . 3 ⊢ (𝜑 → 𝐻 = (𝐹 ∘ (𝑃‘𝐵)))
6		clsneibex.r	. . 3 ⊢ (𝜑 → 𝐾𝐻𝑁)
7	5, 6	breqdi 5108	. 2 ⊢ (𝜑 → 𝐾(𝐹 ∘ (𝑃‘𝐵))𝑁)
8		brne0 5143	. 2 ⊢ (𝐾(𝐹 ∘ (𝑃‘𝐵))𝑁 → (𝐹 ∘ (𝑃‘𝐵)) ≠ ∅)
9		fvprc 6820	. . . . . . . 8 ⊢ (¬ 𝐵 ∈ V → (𝑃‘𝐵) = ∅)
10	9	rneqd 5882	. . . . . . 7 ⊢ (¬ 𝐵 ∈ V → ran (𝑃‘𝐵) = ran ∅)
11		rn0 5870	. . . . . . 7 ⊢ ran ∅ = ∅
12	10, 11	eqtrdi 2784	. . . . . 6 ⊢ (¬ 𝐵 ∈ V → ran (𝑃‘𝐵) = ∅)
13	12	ineq2d 4169	. . . . 5 ⊢ (¬ 𝐵 ∈ V → (dom 𝐹 ∩ ran (𝑃‘𝐵)) = (dom 𝐹 ∩ ∅))
14		in0 4344	. . . . 5 ⊢ (dom 𝐹 ∩ ∅) = ∅
15	13, 14	eqtrdi 2784	. . . 4 ⊢ (¬ 𝐵 ∈ V → (dom 𝐹 ∩ ran (𝑃‘𝐵)) = ∅)
16	15	coemptyd 14888	. . 3 ⊢ (¬ 𝐵 ∈ V → (𝐹 ∘ (𝑃‘𝐵)) = ∅)
17	16	necon1ai 2956	. 2 ⊢ ((𝐹 ∘ (𝑃‘𝐵)) ≠ ∅ → 𝐵 ∈ V)
18	7, 8, 17	3syl 18	1 ⊢ (𝜑 → 𝐵 ∈ V)

Syntax hints:  ¬ wn 3   → wi 4   = wceq 1541   ∈ wcel 2113   ≠ wne 2929  Vcvv 3437   ∩ cin 3897  ∅c0 4282   class class class wbr 5093  dom cdm 5619  ran crn 5620   ∘ ccom 5623  ‘cfv 6486

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-ext 2705  ax-sep 5236  ax-nul 5246  ax-pr 5372

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-sb 2068  df-mo 2537  df-eu 2566  df-clab 2712  df-cleq 2725  df-clel 2808  df-ne 2930  df-ral 3049  df-rex 3058  df-rab 3397  df-v 3439  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-nul 4283  df-if 4475  df-sn 4576  df-pr 4578  df-op 4582  df-uni 4859  df-br 5094  df-opab 5156  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-iota 6442  df-fv 6494

This theorem is referenced by:  clsneircomplex  44220  clsneif1o  44221  clsneicnv  44222  clsneikex  44223  clsneinex  44224  clsneiel1  44225