neibastop1 - Mathbox for Jeff Hankins

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Theorem neibastop1 32950

Description: A collection of neighborhood bases determines a topology. Part of Theorem 4.5 of Stephen Willard's General Topology. (Contributed by Jeff Hankins, 8-Sep-2009.) (Proof shortened by Mario Carneiro, 11-Sep-2015.)

**Hypotheses**
Ref	Expression
neibastop1.1	⊢ (𝜑 → 𝑋 ∈ 𝑉)
neibastop1.2	⊢ (𝜑 → 𝐹:𝑋⟶(𝒫 𝒫 𝑋 ∖ {∅}))
neibastop1.3	⊢ ((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑣 ∈ (𝐹‘𝑥) ∧ 𝑤 ∈ (𝐹‘𝑥))) → ((𝐹‘𝑥) ∩ 𝒫 (𝑣 ∩ 𝑤)) ≠ ∅)
neibastop1.4	⊢ 𝐽 = {𝑜 ∈ 𝒫 𝑋 ∣ ∀𝑥 ∈ 𝑜 ((𝐹‘𝑥) ∩ 𝒫 𝑜) ≠ ∅}

**Assertion**
Ref	Expression
neibastop1	⊢ (𝜑 → 𝐽 ∈ (TopOn‘𝑋))

Distinct variable groups: 𝑥,𝑣,𝐽 𝑣,𝑜,𝑤,𝑥,𝐹 𝜑,𝑜,𝑣,𝑤,𝑥 𝑜,𝑋,𝑣,𝑤,𝑥 Allowed substitution hints: 𝐽(𝑤,𝑜) 𝑉(𝑥,𝑤,𝑣,𝑜)

Proof of Theorem neibastop1 Dummy variables 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpr 479	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ⊆ 𝐽) → 𝑦 ⊆ 𝐽)
2		neibastop1.4	. . . . . . . . . 10 ⊢ 𝐽 = {𝑜 ∈ 𝒫 𝑋 ∣ ∀𝑥 ∈ 𝑜 ((𝐹‘𝑥) ∩ 𝒫 𝑜) ≠ ∅}
3		ssrab2 3908	. . . . . . . . . 10 ⊢ {𝑜 ∈ 𝒫 𝑋 ∣ ∀𝑥 ∈ 𝑜 ((𝐹‘𝑥) ∩ 𝒫 𝑜) ≠ ∅} ⊆ 𝒫 𝑋
4	2, 3	eqsstri 3854	. . . . . . . . 9 ⊢ 𝐽 ⊆ 𝒫 𝑋
5	1, 4	syl6ss 3833	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑦 ⊆ 𝐽) → 𝑦 ⊆ 𝒫 𝑋)
6		sspwuni 4847	. . . . . . . 8 ⊢ (𝑦 ⊆ 𝒫 𝑋 ↔ ∪ 𝑦 ⊆ 𝑋)
7	5, 6	sylib 210	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ⊆ 𝐽) → ∪ 𝑦 ⊆ 𝑋)
8		vuniex 7233	. . . . . . . 8 ⊢ ∪ 𝑦 ∈ V
9	8	elpw 4385	. . . . . . 7 ⊢ (∪ 𝑦 ∈ 𝒫 𝑋 ↔ ∪ 𝑦 ⊆ 𝑋)
10	7, 9	sylibr 226	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ⊆ 𝐽) → ∪ 𝑦 ∈ 𝒫 𝑋)
11		eluni2 4677	. . . . . . . 8 ⊢ (𝑥 ∈ ∪ 𝑦 ↔ ∃𝑧 ∈ 𝑦 𝑥 ∈ 𝑧)
12		elssuni 4704	. . . . . . . . . . . . 13 ⊢ (𝑧 ∈ 𝑦 → 𝑧 ⊆ ∪ 𝑦)
13	12	ad2antrl 718	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑦 ⊆ 𝐽) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ 𝑧)) → 𝑧 ⊆ ∪ 𝑦)
14		sspwb 5151	. . . . . . . . . . . 12 ⊢ (𝑧 ⊆ ∪ 𝑦 ↔ 𝒫 𝑧 ⊆ 𝒫 ∪ 𝑦)
15	13, 14	sylib 210	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ⊆ 𝐽) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ 𝑧)) → 𝒫 𝑧 ⊆ 𝒫 ∪ 𝑦)
16		sslin 4059	. . . . . . . . . . 11 ⊢ (𝒫 𝑧 ⊆ 𝒫 ∪ 𝑦 → ((𝐹‘𝑥) ∩ 𝒫 𝑧) ⊆ ((𝐹‘𝑥) ∩ 𝒫 ∪ 𝑦))
17	15, 16	syl 17	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑦 ⊆ 𝐽) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ 𝑧)) → ((𝐹‘𝑥) ∩ 𝒫 𝑧) ⊆ ((𝐹‘𝑥) ∩ 𝒫 ∪ 𝑦))
18	1	sselda 3821	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑦 ⊆ 𝐽) ∧ 𝑧 ∈ 𝑦) → 𝑧 ∈ 𝐽)
19	18	adantrr 707	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑦 ⊆ 𝐽) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ 𝑧)) → 𝑧 ∈ 𝐽)
20		pweq 4382	. . . . . . . . . . . . . . . . 17 ⊢ (𝑜 = 𝑧 → 𝒫 𝑜 = 𝒫 𝑧)
21	20	ineq2d 4037	. . . . . . . . . . . . . . . 16 ⊢ (𝑜 = 𝑧 → ((𝐹‘𝑥) ∩ 𝒫 𝑜) = ((𝐹‘𝑥) ∩ 𝒫 𝑧))
22	21	neeq1d 3028	. . . . . . . . . . . . . . 15 ⊢ (𝑜 = 𝑧 → (((𝐹‘𝑥) ∩ 𝒫 𝑜) ≠ ∅ ↔ ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅))
23	22	raleqbi1dv 3328	. . . . . . . . . . . . . 14 ⊢ (𝑜 = 𝑧 → (∀𝑥 ∈ 𝑜 ((𝐹‘𝑥) ∩ 𝒫 𝑜) ≠ ∅ ↔ ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅))
24	23, 2	elrab2 3576	. . . . . . . . . . . . 13 ⊢ (𝑧 ∈ 𝐽 ↔ (𝑧 ∈ 𝒫 𝑋 ∧ ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅))
25	24	simprbi 492	. . . . . . . . . . . 12 ⊢ (𝑧 ∈ 𝐽 → ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅)
26	19, 25	syl 17	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ⊆ 𝐽) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ 𝑧)) → ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅)
27		simprr 763	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ⊆ 𝐽) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ 𝑧)) → 𝑥 ∈ 𝑧)
28		rsp 3111	. . . . . . . . . . 11 ⊢ (∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅ → (𝑥 ∈ 𝑧 → ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅))
29	26, 27, 28	sylc 65	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑦 ⊆ 𝐽) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ 𝑧)) → ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅)
30		ssn0 4202	. . . . . . . . . 10 ⊢ ((((𝐹‘𝑥) ∩ 𝒫 𝑧) ⊆ ((𝐹‘𝑥) ∩ 𝒫 ∪ 𝑦) ∧ ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅) → ((𝐹‘𝑥) ∩ 𝒫 ∪ 𝑦) ≠ ∅)
31	17, 29, 30	syl2anc 579	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑦 ⊆ 𝐽) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ 𝑧)) → ((𝐹‘𝑥) ∩ 𝒫 ∪ 𝑦) ≠ ∅)
32	31	rexlimdvaa 3214	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑦 ⊆ 𝐽) → (∃𝑧 ∈ 𝑦 𝑥 ∈ 𝑧 → ((𝐹‘𝑥) ∩ 𝒫 ∪ 𝑦) ≠ ∅))
33	11, 32	syl5bi 234	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ⊆ 𝐽) → (𝑥 ∈ ∪ 𝑦 → ((𝐹‘𝑥) ∩ 𝒫 ∪ 𝑦) ≠ ∅))
34	33	ralrimiv 3147	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ⊆ 𝐽) → ∀𝑥 ∈ ∪ 𝑦((𝐹‘𝑥) ∩ 𝒫 ∪ 𝑦) ≠ ∅)
35		pweq 4382	. . . . . . . . . 10 ⊢ (𝑜 = ∪ 𝑦 → 𝒫 𝑜 = 𝒫 ∪ 𝑦)
36	35	ineq2d 4037	. . . . . . . . 9 ⊢ (𝑜 = ∪ 𝑦 → ((𝐹‘𝑥) ∩ 𝒫 𝑜) = ((𝐹‘𝑥) ∩ 𝒫 ∪ 𝑦))
37	36	neeq1d 3028	. . . . . . . 8 ⊢ (𝑜 = ∪ 𝑦 → (((𝐹‘𝑥) ∩ 𝒫 𝑜) ≠ ∅ ↔ ((𝐹‘𝑥) ∩ 𝒫 ∪ 𝑦) ≠ ∅))
38	37	raleqbi1dv 3328	. . . . . . 7 ⊢ (𝑜 = ∪ 𝑦 → (∀𝑥 ∈ 𝑜 ((𝐹‘𝑥) ∩ 𝒫 𝑜) ≠ ∅ ↔ ∀𝑥 ∈ ∪ 𝑦((𝐹‘𝑥) ∩ 𝒫 ∪ 𝑦) ≠ ∅))
39	38, 2	elrab2 3576	. . . . . 6 ⊢ (∪ 𝑦 ∈ 𝐽 ↔ (∪ 𝑦 ∈ 𝒫 𝑋 ∧ ∀𝑥 ∈ ∪ 𝑦((𝐹‘𝑥) ∩ 𝒫 ∪ 𝑦) ≠ ∅))
40	10, 34, 39	sylanbrc 578	. . . . 5 ⊢ ((𝜑 ∧ 𝑦 ⊆ 𝐽) → ∪ 𝑦 ∈ 𝐽)
41	40	ex 403	. . . 4 ⊢ (𝜑 → (𝑦 ⊆ 𝐽 → ∪ 𝑦 ∈ 𝐽))
42	41	alrimiv 1970	. . 3 ⊢ (𝜑 → ∀𝑦(𝑦 ⊆ 𝐽 → ∪ 𝑦 ∈ 𝐽))
43		pweq 4382	. . . . . . . . . . 11 ⊢ (𝑜 = 𝑦 → 𝒫 𝑜 = 𝒫 𝑦)
44	43	ineq2d 4037	. . . . . . . . . 10 ⊢ (𝑜 = 𝑦 → ((𝐹‘𝑥) ∩ 𝒫 𝑜) = ((𝐹‘𝑥) ∩ 𝒫 𝑦))
45	44	neeq1d 3028	. . . . . . . . 9 ⊢ (𝑜 = 𝑦 → (((𝐹‘𝑥) ∩ 𝒫 𝑜) ≠ ∅ ↔ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅))
46	45	raleqbi1dv 3328	. . . . . . . 8 ⊢ (𝑜 = 𝑦 → (∀𝑥 ∈ 𝑜 ((𝐹‘𝑥) ∩ 𝒫 𝑜) ≠ ∅ ↔ ∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅))
47	46, 2	elrab2 3576	. . . . . . 7 ⊢ (𝑦 ∈ 𝐽 ↔ (𝑦 ∈ 𝒫 𝑋 ∧ ∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅))
48	47, 24	anbi12i 620	. . . . . 6 ⊢ ((𝑦 ∈ 𝐽 ∧ 𝑧 ∈ 𝐽) ↔ ((𝑦 ∈ 𝒫 𝑋 ∧ ∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅) ∧ (𝑧 ∈ 𝒫 𝑋 ∧ ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅)))
49		an4 646	. . . . . 6 ⊢ (((𝑦 ∈ 𝒫 𝑋 ∧ ∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅) ∧ (𝑧 ∈ 𝒫 𝑋 ∧ ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅)) ↔ ((𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋) ∧ (∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅)))
50	48, 49	bitri 267	. . . . 5 ⊢ ((𝑦 ∈ 𝐽 ∧ 𝑧 ∈ 𝐽) ↔ ((𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋) ∧ (∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅)))
51		inss1 4053	. . . . . . . . . 10 ⊢ (𝑦 ∩ 𝑧) ⊆ 𝑦
52		elpwi 4389	. . . . . . . . . 10 ⊢ (𝑦 ∈ 𝒫 𝑋 → 𝑦 ⊆ 𝑋)
53	51, 52	syl5ss 3832	. . . . . . . . 9 ⊢ (𝑦 ∈ 𝒫 𝑋 → (𝑦 ∩ 𝑧) ⊆ 𝑋)
54	53	ad2antrl 718	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) → (𝑦 ∩ 𝑧) ⊆ 𝑋)
55	54	adantrr 707	. . . . . . 7 ⊢ ((𝜑 ∧ ((𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋) ∧ (∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅))) → (𝑦 ∩ 𝑧) ⊆ 𝑋)
56		vex 3401	. . . . . . . . 9 ⊢ 𝑦 ∈ V
57	56	inex1 5038	. . . . . . . 8 ⊢ (𝑦 ∩ 𝑧) ∈ V
58	57	elpw 4385	. . . . . . 7 ⊢ ((𝑦 ∩ 𝑧) ∈ 𝒫 𝑋 ↔ (𝑦 ∩ 𝑧) ⊆ 𝑋)
59	55, 58	sylibr 226	. . . . . 6 ⊢ ((𝜑 ∧ ((𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋) ∧ (∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅))) → (𝑦 ∩ 𝑧) ∈ 𝒫 𝑋)
60		ssralv 3885	. . . . . . . . . . 11 ⊢ ((𝑦 ∩ 𝑧) ⊆ 𝑦 → (∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ → ∀𝑥 ∈ (𝑦 ∩ 𝑧)((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅))
61	51, 60	ax-mp 5	. . . . . . . . . 10 ⊢ (∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ → ∀𝑥 ∈ (𝑦 ∩ 𝑧)((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅)
62		inss2 4054	. . . . . . . . . . 11 ⊢ (𝑦 ∩ 𝑧) ⊆ 𝑧
63		ssralv 3885	. . . . . . . . . . 11 ⊢ ((𝑦 ∩ 𝑧) ⊆ 𝑧 → (∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅ → ∀𝑥 ∈ (𝑦 ∩ 𝑧)((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅))
64	62, 63	ax-mp 5	. . . . . . . . . 10 ⊢ (∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅ → ∀𝑥 ∈ (𝑦 ∩ 𝑧)((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅)
65	61, 64	anim12i 606	. . . . . . . . 9 ⊢ ((∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅) → (∀𝑥 ∈ (𝑦 ∩ 𝑧)((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ∀𝑥 ∈ (𝑦 ∩ 𝑧)((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅))
66		r19.26 3250	. . . . . . . . 9 ⊢ (∀𝑥 ∈ (𝑦 ∩ 𝑧)(((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅) ↔ (∀𝑥 ∈ (𝑦 ∩ 𝑧)((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ∀𝑥 ∈ (𝑦 ∩ 𝑧)((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅))
67	65, 66	sylibr 226	. . . . . . . 8 ⊢ ((∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅) → ∀𝑥 ∈ (𝑦 ∩ 𝑧)(((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅))
68		n0 4159	. . . . . . . . . . 11 ⊢ (((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ↔ ∃𝑣 𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦))
69		n0 4159	. . . . . . . . . . 11 ⊢ (((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅ ↔ ∃𝑤 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))
70	68, 69	anbi12i 620	. . . . . . . . . 10 ⊢ ((((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅) ↔ (∃𝑣 𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ ∃𝑤 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧)))
71		exdistrv 1998	. . . . . . . . . . 11 ⊢ (∃𝑣∃𝑤(𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧)) ↔ (∃𝑣 𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ ∃𝑤 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧)))
72		inss2 4054	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ⊆ 𝒫 𝑦
73		simprl 761	. . . . . . . . . . . . . . . . . . 19 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → 𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦))
74	72, 73	sseldi 3819	. . . . . . . . . . . . . . . . . 18 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → 𝑣 ∈ 𝒫 𝑦)
75	74	elpwid 4391	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → 𝑣 ⊆ 𝑦)
76		inss2 4054	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝐹‘𝑥) ∩ 𝒫 𝑧) ⊆ 𝒫 𝑧
77		simprr 763	. . . . . . . . . . . . . . . . . . 19 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))
78	76, 77	sseldi 3819	. . . . . . . . . . . . . . . . . 18 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → 𝑤 ∈ 𝒫 𝑧)
79	78	elpwid 4391	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → 𝑤 ⊆ 𝑧)
80		ss2in 4061	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑣 ⊆ 𝑦 ∧ 𝑤 ⊆ 𝑧) → (𝑣 ∩ 𝑤) ⊆ (𝑦 ∩ 𝑧))
81	75, 79, 80	syl2anc 579	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → (𝑣 ∩ 𝑤) ⊆ (𝑦 ∩ 𝑧))
82		sspwb 5151	. . . . . . . . . . . . . . . 16 ⊢ ((𝑣 ∩ 𝑤) ⊆ (𝑦 ∩ 𝑧) ↔ 𝒫 (𝑣 ∩ 𝑤) ⊆ 𝒫 (𝑦 ∩ 𝑧))
83	81, 82	sylib 210	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → 𝒫 (𝑣 ∩ 𝑤) ⊆ 𝒫 (𝑦 ∩ 𝑧))
84		sslin 4059	. . . . . . . . . . . . . . 15 ⊢ (𝒫 (𝑣 ∩ 𝑤) ⊆ 𝒫 (𝑦 ∩ 𝑧) → ((𝐹‘𝑥) ∩ 𝒫 (𝑣 ∩ 𝑤)) ⊆ ((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)))
85	83, 84	syl 17	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → ((𝐹‘𝑥) ∩ 𝒫 (𝑣 ∩ 𝑤)) ⊆ ((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)))
86		simplll 765	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → 𝜑)
87	54	ad2antrr 716	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → (𝑦 ∩ 𝑧) ⊆ 𝑋)
88		simplr 759	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → 𝑥 ∈ (𝑦 ∩ 𝑧))
89	87, 88	sseldd 3822	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → 𝑥 ∈ 𝑋)
90		inss1 4053	. . . . . . . . . . . . . . . 16 ⊢ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ⊆ (𝐹‘𝑥)
91	90, 73	sseldi 3819	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → 𝑣 ∈ (𝐹‘𝑥))
92		inss1 4053	. . . . . . . . . . . . . . . 16 ⊢ ((𝐹‘𝑥) ∩ 𝒫 𝑧) ⊆ (𝐹‘𝑥)
93	92, 77	sseldi 3819	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → 𝑤 ∈ (𝐹‘𝑥))
94		neibastop1.3	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑣 ∈ (𝐹‘𝑥) ∧ 𝑤 ∈ (𝐹‘𝑥))) → ((𝐹‘𝑥) ∩ 𝒫 (𝑣 ∩ 𝑤)) ≠ ∅)
95	86, 89, 91, 93, 94	syl13anc 1440	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → ((𝐹‘𝑥) ∩ 𝒫 (𝑣 ∩ 𝑤)) ≠ ∅)
96		ssn0 4202	. . . . . . . . . . . . . 14 ⊢ ((((𝐹‘𝑥) ∩ 𝒫 (𝑣 ∩ 𝑤)) ⊆ ((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)) ∧ ((𝐹‘𝑥) ∩ 𝒫 (𝑣 ∩ 𝑤)) ≠ ∅) → ((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)) ≠ ∅)
97	85, 95, 96	syl2anc 579	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) ∧ (𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧))) → ((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)) ≠ ∅)
98	97	ex 403	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) → ((𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧)) → ((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)) ≠ ∅))
99	98	exlimdvv 1977	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) → (∃𝑣∃𝑤(𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧)) → ((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)) ≠ ∅))
100	71, 99	syl5bir 235	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) → ((∃𝑣 𝑣 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑦) ∧ ∃𝑤 𝑤 ∈ ((𝐹‘𝑥) ∩ 𝒫 𝑧)) → ((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)) ≠ ∅))
101	70, 100	syl5bi 234	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) ∧ 𝑥 ∈ (𝑦 ∩ 𝑧)) → ((((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅) → ((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)) ≠ ∅))
102	101	ralimdva 3144	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) → (∀𝑥 ∈ (𝑦 ∩ 𝑧)(((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅) → ∀𝑥 ∈ (𝑦 ∩ 𝑧)((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)) ≠ ∅))
103	67, 102	syl5 34	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋)) → ((∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅) → ∀𝑥 ∈ (𝑦 ∩ 𝑧)((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)) ≠ ∅))
104	103	impr 448	. . . . . 6 ⊢ ((𝜑 ∧ ((𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋) ∧ (∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅))) → ∀𝑥 ∈ (𝑦 ∩ 𝑧)((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)) ≠ ∅)
105		pweq 4382	. . . . . . . . . 10 ⊢ (𝑜 = (𝑦 ∩ 𝑧) → 𝒫 𝑜 = 𝒫 (𝑦 ∩ 𝑧))
106	105	ineq2d 4037	. . . . . . . . 9 ⊢ (𝑜 = (𝑦 ∩ 𝑧) → ((𝐹‘𝑥) ∩ 𝒫 𝑜) = ((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)))
107	106	neeq1d 3028	. . . . . . . 8 ⊢ (𝑜 = (𝑦 ∩ 𝑧) → (((𝐹‘𝑥) ∩ 𝒫 𝑜) ≠ ∅ ↔ ((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)) ≠ ∅))
108	107	raleqbi1dv 3328	. . . . . . 7 ⊢ (𝑜 = (𝑦 ∩ 𝑧) → (∀𝑥 ∈ 𝑜 ((𝐹‘𝑥) ∩ 𝒫 𝑜) ≠ ∅ ↔ ∀𝑥 ∈ (𝑦 ∩ 𝑧)((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)) ≠ ∅))
109	108, 2	elrab2 3576	. . . . . 6 ⊢ ((𝑦 ∩ 𝑧) ∈ 𝐽 ↔ ((𝑦 ∩ 𝑧) ∈ 𝒫 𝑋 ∧ ∀𝑥 ∈ (𝑦 ∩ 𝑧)((𝐹‘𝑥) ∩ 𝒫 (𝑦 ∩ 𝑧)) ≠ ∅))
110	59, 104, 109	sylanbrc 578	. . . . 5 ⊢ ((𝜑 ∧ ((𝑦 ∈ 𝒫 𝑋 ∧ 𝑧 ∈ 𝒫 𝑋) ∧ (∀𝑥 ∈ 𝑦 ((𝐹‘𝑥) ∩ 𝒫 𝑦) ≠ ∅ ∧ ∀𝑥 ∈ 𝑧 ((𝐹‘𝑥) ∩ 𝒫 𝑧) ≠ ∅))) → (𝑦 ∩ 𝑧) ∈ 𝐽)
111	50, 110	sylan2b 587	. . . 4 ⊢ ((𝜑 ∧ (𝑦 ∈ 𝐽 ∧ 𝑧 ∈ 𝐽)) → (𝑦 ∩ 𝑧) ∈ 𝐽)
112	111	ralrimivva 3153	. . 3 ⊢ (𝜑 → ∀𝑦 ∈ 𝐽 ∀𝑧 ∈ 𝐽 (𝑦 ∩ 𝑧) ∈ 𝐽)
113		neibastop1.1	. . . . . 6 ⊢ (𝜑 → 𝑋 ∈ 𝑉)
114		sspwuni 4847	. . . . . . . 8 ⊢ (𝐽 ⊆ 𝒫 𝑋 ↔ ∪ 𝐽 ⊆ 𝑋)
115	4, 114	mpbi 222	. . . . . . 7 ⊢ ∪ 𝐽 ⊆ 𝑋
116	115	a1i 11	. . . . . 6 ⊢ (𝜑 → ∪ 𝐽 ⊆ 𝑋)
117	113, 116	ssexd 5044	. . . . 5 ⊢ (𝜑 → ∪ 𝐽 ∈ V)
118		uniexb 7252	. . . . 5 ⊢ (𝐽 ∈ V ↔ ∪ 𝐽 ∈ V)
119	117, 118	sylibr 226	. . . 4 ⊢ (𝜑 → 𝐽 ∈ V)
120		istopg 21118	. . . 4 ⊢ (𝐽 ∈ V → (𝐽 ∈ Top ↔ (∀𝑦(𝑦 ⊆ 𝐽 → ∪ 𝑦 ∈ 𝐽) ∧ ∀𝑦 ∈ 𝐽 ∀𝑧 ∈ 𝐽 (𝑦 ∩ 𝑧) ∈ 𝐽)))
121	119, 120	syl 17	. . 3 ⊢ (𝜑 → (𝐽 ∈ Top ↔ (∀𝑦(𝑦 ⊆ 𝐽 → ∪ 𝑦 ∈ 𝐽) ∧ ∀𝑦 ∈ 𝐽 ∀𝑧 ∈ 𝐽 (𝑦 ∩ 𝑧) ∈ 𝐽)))
122	42, 112, 121	mpbir2and 703	. 2 ⊢ (𝜑 → 𝐽 ∈ Top)
123		pwidg 4394	. . . . . 6 ⊢ (𝑋 ∈ 𝑉 → 𝑋 ∈ 𝒫 𝑋)
124	113, 123	syl 17	. . . . 5 ⊢ (𝜑 → 𝑋 ∈ 𝒫 𝑋)
125		neibastop1.2	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹:𝑋⟶(𝒫 𝒫 𝑋 ∖ {∅}))
126	125	ffvelrnda 6625	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → (𝐹‘𝑥) ∈ (𝒫 𝒫 𝑋 ∖ {∅}))
127		eldifi 3955	. . . . . . . . 9 ⊢ ((𝐹‘𝑥) ∈ (𝒫 𝒫 𝑋 ∖ {∅}) → (𝐹‘𝑥) ∈ 𝒫 𝒫 𝑋)
128		elpwi 4389	. . . . . . . . 9 ⊢ ((𝐹‘𝑥) ∈ 𝒫 𝒫 𝑋 → (𝐹‘𝑥) ⊆ 𝒫 𝑋)
129	126, 127, 128	3syl 18	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → (𝐹‘𝑥) ⊆ 𝒫 𝑋)
130		df-ss 3806	. . . . . . . 8 ⊢ ((𝐹‘𝑥) ⊆ 𝒫 𝑋 ↔ ((𝐹‘𝑥) ∩ 𝒫 𝑋) = (𝐹‘𝑥))
131	129, 130	sylib 210	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ((𝐹‘𝑥) ∩ 𝒫 𝑋) = (𝐹‘𝑥))
132		eldifsni 4553	. . . . . . . 8 ⊢ ((𝐹‘𝑥) ∈ (𝒫 𝒫 𝑋 ∖ {∅}) → (𝐹‘𝑥) ≠ ∅)
133	126, 132	syl 17	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → (𝐹‘𝑥) ≠ ∅)
134	131, 133	eqnetrd 3036	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ((𝐹‘𝑥) ∩ 𝒫 𝑋) ≠ ∅)
135	134	ralrimiva 3148	. . . . 5 ⊢ (𝜑 → ∀𝑥 ∈ 𝑋 ((𝐹‘𝑥) ∩ 𝒫 𝑋) ≠ ∅)
136		pweq 4382	. . . . . . . . 9 ⊢ (𝑜 = 𝑋 → 𝒫 𝑜 = 𝒫 𝑋)
137	136	ineq2d 4037	. . . . . . . 8 ⊢ (𝑜 = 𝑋 → ((𝐹‘𝑥) ∩ 𝒫 𝑜) = ((𝐹‘𝑥) ∩ 𝒫 𝑋))
138	137	neeq1d 3028	. . . . . . 7 ⊢ (𝑜 = 𝑋 → (((𝐹‘𝑥) ∩ 𝒫 𝑜) ≠ ∅ ↔ ((𝐹‘𝑥) ∩ 𝒫 𝑋) ≠ ∅))
139	138	raleqbi1dv 3328	. . . . . 6 ⊢ (𝑜 = 𝑋 → (∀𝑥 ∈ 𝑜 ((𝐹‘𝑥) ∩ 𝒫 𝑜) ≠ ∅ ↔ ∀𝑥 ∈ 𝑋 ((𝐹‘𝑥) ∩ 𝒫 𝑋) ≠ ∅))
140	139, 2	elrab2 3576	. . . . 5 ⊢ (𝑋 ∈ 𝐽 ↔ (𝑋 ∈ 𝒫 𝑋 ∧ ∀𝑥 ∈ 𝑋 ((𝐹‘𝑥) ∩ 𝒫 𝑋) ≠ ∅))
141	124, 135, 140	sylanbrc 578	. . . 4 ⊢ (𝜑 → 𝑋 ∈ 𝐽)
142		elssuni 4704	. . . 4 ⊢ (𝑋 ∈ 𝐽 → 𝑋 ⊆ ∪ 𝐽)
143	141, 142	syl 17	. . 3 ⊢ (𝜑 → 𝑋 ⊆ ∪ 𝐽)
144	143, 116	eqssd 3838	. 2 ⊢ (𝜑 → 𝑋 = ∪ 𝐽)
145		istopon 21135	. 2 ⊢ (𝐽 ∈ (TopOn‘𝑋) ↔ (𝐽 ∈ Top ∧ 𝑋 = ∪ 𝐽))
146	122, 144, 145	sylanbrc 578	1 ⊢ (𝜑 → 𝐽 ∈ (TopOn‘𝑋))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 198 ∧ wa 386 ∧ w3a 1071 ∀wal 1599 = wceq 1601 ∃wex 1823 ∈ wcel 2107 ≠ wne 2969 ∀wral 3090 ∃wrex 3091 {crab 3094 Vcvv 3398 ∖ cdif 3789 ∩ cin 3791 ⊆ wss 3792 ∅c0 4141 𝒫 cpw 4379 {csn 4398 ∪ cuni 4673 ⟶wf 6133 ‘cfv 6137 Topctop 21116 TopOnctopon 21133

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1839 ax-4 1853 ax-5 1953 ax-6 2021 ax-7 2055 ax-8 2109 ax-9 2116 ax-10 2135 ax-11 2150 ax-12 2163 ax-13 2334 ax-ext 2754 ax-sep 5019 ax-nul 5027 ax-pow 5079 ax-pr 5140 ax-un 7228

This theorem depends on definitions: df-bi 199 df-an 387 df-or 837 df-3an 1073 df-tru 1605 df-ex 1824 df-nf 1828 df-sb 2012 df-mo 2551 df-eu 2587 df-clab 2764 df-cleq 2770 df-clel 2774 df-nfc 2921 df-ne 2970 df-ral 3095 df-rex 3096 df-rab 3099 df-v 3400 df-sbc 3653 df-dif 3795 df-un 3797 df-in 3799 df-ss 3806 df-nul 4142 df-if 4308 df-pw 4381 df-sn 4399 df-pr 4401 df-op 4405 df-uni 4674 df-br 4889 df-opab 4951 df-mpt 4968 df-id 5263 df-xp 5363 df-rel 5364 df-cnv 5365 df-co 5366 df-dm 5367 df-rn 5368 df-iota 6101 df-fun 6139 df-fn 6140 df-f 6141 df-fv 6145 df-top 21117 df-topon 21134

This theorem is referenced by: neibastop2 32952 neibastop3 32953

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