Theorem clsneibex 40526

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 5724	. . . . 5 ⊢ (𝐹 ∘ 𝐷) = (𝐹 ∘ (𝑃‘𝐵))
4	1, 3	eqtri 2843	. . . 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 5074	. 2 ⊢ (𝜑 → 𝐾(𝐹 ∘ (𝑃‘𝐵))𝑁)
8		brne0 5109	. 2 ⊢ (𝐾(𝐹 ∘ (𝑃‘𝐵))𝑁 → (𝐹 ∘ (𝑃‘𝐵)) ≠ ∅)
9		fvprc 6656	. . . . . . . 8 ⊢ (¬ 𝐵 ∈ V → (𝑃‘𝐵) = ∅)
10	9	rneqd 5801	. . . . . . 7 ⊢ (¬ 𝐵 ∈ V → ran (𝑃‘𝐵) = ran ∅)
11		rn0 5789	. . . . . . 7 ⊢ ran ∅ = ∅
12	10, 11	syl6eq 2871	. . . . . 6 ⊢ (¬ 𝐵 ∈ V → ran (𝑃‘𝐵) = ∅)
13	12	ineq2d 4182	. . . . 5 ⊢ (¬ 𝐵 ∈ V → (dom 𝐹 ∩ ran (𝑃‘𝐵)) = (dom 𝐹 ∩ ∅))
14		in0 4338	. . . . 5 ⊢ (dom 𝐹 ∩ ∅) = ∅
15	13, 14	syl6eq 2871	. . . 4 ⊢ (¬ 𝐵 ∈ V → (dom 𝐹 ∩ ran (𝑃‘𝐵)) = ∅)
16	15	coemptyd 14334	. . 3 ⊢ (¬ 𝐵 ∈ V → (𝐹 ∘ (𝑃‘𝐵)) = ∅)
17	16	necon1ai 3042	. 2 ⊢ ((𝐹 ∘ (𝑃‘𝐵)) ≠ ∅ → 𝐵 ∈ V)
18	7, 8, 17	3syl 18	1 ⊢ (𝜑 → 𝐵 ∈ V)

Syntax hints:  ¬ wn 3   → wi 4   = wceq 1536   ∈ wcel 2113   ≠ wne 3015  Vcvv 3491   ∩ cin 3928  ∅c0 4284   class class class wbr 5059  dom cdm 5548  ran crn 5549   ∘ ccom 5552  ‘cfv 6348

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 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2792  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5323

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1084  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-mo 2621  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2892  df-nfc 2962  df-ne 3016  df-ral 3142  df-rex 3143  df-rab 3146  df-v 3493  df-dif 3932  df-un 3934  df-in 3936  df-ss 3945  df-nul 4285  df-if 4461  df-sn 4561  df-pr 4563  df-op 4567  df-uni 4832  df-br 5060  df-opab 5122  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-iota 6307  df-fv 6356

This theorem is referenced by:  clsneircomplex  40527  clsneif1o  40528  clsneicnv  40529  clsneikex  40530  clsneinex  40531  clsneiel1  40532