Theorem clsneibex 44642

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 5830	. . . . 5 ⊢ (𝐹 ∘ 𝐷) = (𝐹 ∘ (𝑃‘𝐵))
4	1, 3	eqtri 2784	. . . 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 5114	. 2 ⊢ (𝜑 → 𝐾(𝐹 ∘ (𝑃‘𝐵))𝑁)
8		brne0 5149	. 2 ⊢ (𝐾(𝐹 ∘ (𝑃‘𝐵))𝑁 → (𝐹 ∘ (𝑃‘𝐵)) ≠ ∅)
9		fvprc 6855	. . . . . . . 8 ⊢ (¬ 𝐵 ∈ V → (𝑃‘𝐵) = ∅)
10	9	rneqd 5912	. . . . . . 7 ⊢ (¬ 𝐵 ∈ V → ran (𝑃‘𝐵) = ran ∅)
11		rn0 5900	. . . . . . 7 ⊢ ran ∅ = ∅
12	10, 11	eqtrdi 2812	. . . . . 6 ⊢ (¬ 𝐵 ∈ V → ran (𝑃‘𝐵) = ∅)
13	12	ineq2d 4172	. . . . 5 ⊢ (¬ 𝐵 ∈ V → (dom 𝐹 ∩ ran (𝑃‘𝐵)) = (dom 𝐹 ∩ ∅))
14		in0 4348	. . . . 5 ⊢ (dom 𝐹 ∩ ∅) = ∅
15	13, 14	eqtrdi 2812	. . . 4 ⊢ (¬ 𝐵 ∈ V → (dom 𝐹 ∩ ran (𝑃‘𝐵)) = ∅)
16	15	coemptyd 14989	. . 3 ⊢ (¬ 𝐵 ∈ V → (𝐹 ∘ (𝑃‘𝐵)) = ∅)
17	16	necon1ai 2983	. 2 ⊢ ((𝐹 ∘ (𝑃‘𝐵)) ≠ ∅ → 𝐵 ∈ V)
18	7, 8, 17	3syl 18	1 ⊢ (𝜑 → 𝐵 ∈ V)

Syntax hints:  ¬ wn 3   → wi 4   = wceq 1559   ∈ wcel 2141   ≠ wne 2956  Vcvv 3453   ∩ cin 3903  ∅c0 4285   class class class wbr 5099  dom cdm 5645  ran crn 5646   ∘ ccom 5649  ‘cfv 6517

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-ext 2733  ax-sep 5245  ax-nul 5255  ax-pr 5389

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-sb 2090  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-ne 2957  df-ral 3076  df-rex 3086  df-rab 3414  df-v 3455  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4480  df-sn 4582  df-pr 4584  df-op 4588  df-uni 4865  df-br 5100  df-opab 5162  df-xp 5651  df-rel 5652  df-cnv 5653  df-co 5654  df-dm 5655  df-rn 5656  df-res 5657  df-iota 6473  df-fv 6525

This theorem is referenced by:  clsneircomplex  44643  clsneif1o  44644  clsneicnv  44645  clsneikex  44646  clsneinex  44647  clsneiel1  44648