Theorem iunconn 22038

Description: The indexed union of connected overlapping subspaces sharing a common point is connected. (Contributed by Mario Carneiro, 11-Jun-2014.)

Hypotheses

Ref	Expression
iunconn.2	⊢ (𝜑 → 𝐽 ∈ (TopOn‘𝑋))
iunconn.3	⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ⊆ 𝑋)
iunconn.4	⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝑃 ∈ 𝐵)
iunconn.5	⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → (𝐽 ↾t 𝐵) ∈ Conn)

Assertion

Ref	Expression
iunconn	⊢ (𝜑 → (𝐽 ↾t ∪ 𝑘 ∈ 𝐴 𝐵) ∈ Conn)

Distinct variable groups:   𝐴,𝑘   𝑘,𝐽   𝑃,𝑘   𝑘,𝑋   𝜑,𝑘

Allowed substitution hint:   𝐵(𝑘)

Proof of Theorem iunconn

Dummy variables 𝑢 𝑣 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpr 487	. . . . . . 7 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣))
2		simplr1 1211	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅)
3		n0 4312	. . . . . . . . . . 11 ⊢ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ↔ ∃𝑣 𝑣 ∈ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵))
4		elinel2 4175	. . . . . . . . . . . . 13 ⊢ (𝑣 ∈ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) → 𝑣 ∈ ∪ 𝑘 ∈ 𝐴 𝐵)
5		eliun 4925	. . . . . . . . . . . . . 14 ⊢ (𝑣 ∈ ∪ 𝑘 ∈ 𝐴 𝐵 ↔ ∃𝑘 ∈ 𝐴 𝑣 ∈ 𝐵)
6		rexn0 4456	. . . . . . . . . . . . . 14 ⊢ (∃𝑘 ∈ 𝐴 𝑣 ∈ 𝐵 → 𝐴 ≠ ∅)
7	5, 6	sylbi 219	. . . . . . . . . . . . 13 ⊢ (𝑣 ∈ ∪ 𝑘 ∈ 𝐴 𝐵 → 𝐴 ≠ ∅)
8	4, 7	syl 17	. . . . . . . . . . . 12 ⊢ (𝑣 ∈ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) → 𝐴 ≠ ∅)
9	8	exlimiv 1931	. . . . . . . . . . 11 ⊢ (∃𝑣 𝑣 ∈ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) → 𝐴 ≠ ∅)
10	3, 9	sylbi 219	. . . . . . . . . 10 ⊢ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ → 𝐴 ≠ ∅)
11	2, 10	syl 17	. . . . . . . . 9 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → 𝐴 ≠ ∅)
12		simplll 773	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → 𝜑)
13		iunconn.4	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝑃 ∈ 𝐵)
14	13	ralrimiva 3184	. . . . . . . . . 10 ⊢ (𝜑 → ∀𝑘 ∈ 𝐴 𝑃 ∈ 𝐵)
15	12, 14	syl 17	. . . . . . . . 9 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → ∀𝑘 ∈ 𝐴 𝑃 ∈ 𝐵)
16		r19.2z 4442	. . . . . . . . 9 ⊢ ((𝐴 ≠ ∅ ∧ ∀𝑘 ∈ 𝐴 𝑃 ∈ 𝐵) → ∃𝑘 ∈ 𝐴 𝑃 ∈ 𝐵)
17	11, 15, 16	syl2anc 586	. . . . . . . 8 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → ∃𝑘 ∈ 𝐴 𝑃 ∈ 𝐵)
18		eliun 4925	. . . . . . . 8 ⊢ (𝑃 ∈ ∪ 𝑘 ∈ 𝐴 𝐵 ↔ ∃𝑘 ∈ 𝐴 𝑃 ∈ 𝐵)
19	17, 18	sylibr 236	. . . . . . 7 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → 𝑃 ∈ ∪ 𝑘 ∈ 𝐴 𝐵)
20	1, 19	sseldd 3970	. . . . . 6 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → 𝑃 ∈ (𝑢 ∪ 𝑣))
21		elun 4127	. . . . . 6 ⊢ (𝑃 ∈ (𝑢 ∪ 𝑣) ↔ (𝑃 ∈ 𝑢 ∨ 𝑃 ∈ 𝑣))
22	20, 21	sylib 220	. . . . 5 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → (𝑃 ∈ 𝑢 ∨ 𝑃 ∈ 𝑣))
23		iunconn.2	. . . . . . . 8 ⊢ (𝜑 → 𝐽 ∈ (TopOn‘𝑋))
24	12, 23	syl 17	. . . . . . 7 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → 𝐽 ∈ (TopOn‘𝑋))
25		iunconn.3	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ⊆ 𝑋)
26	12, 25	sylan 582	. . . . . . 7 ⊢ (((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) ∧ 𝑘 ∈ 𝐴) → 𝐵 ⊆ 𝑋)
27	12, 13	sylan 582	. . . . . . 7 ⊢ (((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) ∧ 𝑘 ∈ 𝐴) → 𝑃 ∈ 𝐵)
28		iunconn.5	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → (𝐽 ↾t 𝐵) ∈ Conn)
29	12, 28	sylan 582	. . . . . . 7 ⊢ (((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) ∧ 𝑘 ∈ 𝐴) → (𝐽 ↾t 𝐵) ∈ Conn)
30		simpllr 774	. . . . . . . 8 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽))
31	30	simpld 497	. . . . . . 7 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → 𝑢 ∈ 𝐽)
32	30	simprd 498	. . . . . . 7 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → 𝑣 ∈ 𝐽)
33		simplr2 1212	. . . . . . 7 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅)
34		simplr3 1213	. . . . . . 7 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))
35		nfv 1915	. . . . . . . . 9 ⊢ Ⅎ𝑘(𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽))
36		nfcv 2979	. . . . . . . . . . . 12 ⊢ Ⅎ𝑘𝑢
37		nfiu1 4955	. . . . . . . . . . . 12 ⊢ Ⅎ𝑘∪ 𝑘 ∈ 𝐴 𝐵
38	36, 37	nfin 4195	. . . . . . . . . . 11 ⊢ Ⅎ𝑘(𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵)
39		nfcv 2979	. . . . . . . . . . 11 ⊢ Ⅎ𝑘∅
40	38, 39	nfne 3121	. . . . . . . . . 10 ⊢ Ⅎ𝑘(𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅
41		nfcv 2979	. . . . . . . . . . . 12 ⊢ Ⅎ𝑘𝑣
42	41, 37	nfin 4195	. . . . . . . . . . 11 ⊢ Ⅎ𝑘(𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵)
43	42, 39	nfne 3121	. . . . . . . . . 10 ⊢ Ⅎ𝑘(𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅
44		nfcv 2979	. . . . . . . . . . 11 ⊢ Ⅎ𝑘(𝑢 ∩ 𝑣)
45		nfcv 2979	. . . . . . . . . . . 12 ⊢ Ⅎ𝑘𝑋
46	45, 37	nfdif 4104	. . . . . . . . . . 11 ⊢ Ⅎ𝑘(𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵)
47	44, 46	nfss 3962	. . . . . . . . . 10 ⊢ Ⅎ𝑘(𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵)
48	40, 43, 47	nf3an 1902	. . . . . . . . 9 ⊢ Ⅎ𝑘((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))
49	35, 48	nfan 1900	. . . . . . . 8 ⊢ Ⅎ𝑘((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵)))
50	36, 41	nfun 4143	. . . . . . . . 9 ⊢ Ⅎ𝑘(𝑢 ∪ 𝑣)
51	37, 50	nfss 3962	. . . . . . . 8 ⊢ Ⅎ𝑘∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)
52	49, 51	nfan 1900	. . . . . . 7 ⊢ Ⅎ𝑘(((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣))
53	24, 26, 27, 29, 31, 32, 33, 34, 1, 52	iunconnlem 22037	. . . . . 6 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → ¬ 𝑃 ∈ 𝑢)
54		incom 4180	. . . . . . . 8 ⊢ (𝑣 ∩ 𝑢) = (𝑢 ∩ 𝑣)
55	54, 34	eqsstrid 4017	. . . . . . 7 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → (𝑣 ∩ 𝑢) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))
56		uncom 4131	. . . . . . . 8 ⊢ (𝑢 ∪ 𝑣) = (𝑣 ∪ 𝑢)
57	1, 56	sseqtrdi 4019	. . . . . . 7 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑣 ∪ 𝑢))
58	24, 26, 27, 29, 32, 31, 2, 55, 57, 52	iunconnlem 22037	. . . . . 6 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → ¬ 𝑃 ∈ 𝑣)
59		ioran 980	. . . . . 6 ⊢ (¬ (𝑃 ∈ 𝑢 ∨ 𝑃 ∈ 𝑣) ↔ (¬ 𝑃 ∈ 𝑢 ∧ ¬ 𝑃 ∈ 𝑣))
60	53, 58, 59	sylanbrc 585	. . . . 5 ⊢ ((((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)) → ¬ (𝑃 ∈ 𝑢 ∨ 𝑃 ∈ 𝑣))
61	22, 60	pm2.65da 815	. . . 4 ⊢ (((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) ∧ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))) → ¬ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣))
62	61	ex 415	. . 3 ⊢ ((𝜑 ∧ (𝑢 ∈ 𝐽 ∧ 𝑣 ∈ 𝐽)) → (((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵)) → ¬ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)))
63	62	ralrimivva 3193	. 2 ⊢ (𝜑 → ∀𝑢 ∈ 𝐽 ∀𝑣 ∈ 𝐽 (((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵)) → ¬ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)))
64	25	ralrimiva 3184	. . . 4 ⊢ (𝜑 → ∀𝑘 ∈ 𝐴 𝐵 ⊆ 𝑋)
65		iunss 4971	. . . 4 ⊢ (∪ 𝑘 ∈ 𝐴 𝐵 ⊆ 𝑋 ↔ ∀𝑘 ∈ 𝐴 𝐵 ⊆ 𝑋)
66	64, 65	sylibr 236	. . 3 ⊢ (𝜑 → ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ 𝑋)
67		connsub 22031	. . 3 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ 𝑋) → ((𝐽 ↾t ∪ 𝑘 ∈ 𝐴 𝐵) ∈ Conn ↔ ∀𝑢 ∈ 𝐽 ∀𝑣 ∈ 𝐽 (((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵)) → ¬ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣))))
68	23, 66, 67	syl2anc 586	. 2 ⊢ (𝜑 → ((𝐽 ↾t ∪ 𝑘 ∈ 𝐴 𝐵) ∈ Conn ↔ ∀𝑢 ∈ 𝐽 ∀𝑣 ∈ 𝐽 (((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵)) → ¬ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣))))
69	63, 68	mpbird 259	1 ⊢ (𝜑 → (𝐽 ↾t ∪ 𝑘 ∈ 𝐴 𝐵) ∈ Conn)

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 208   ∧ wa 398   ∨ wo 843   ∧ w3a 1083  ∃wex 1780   ∈ wcel 2114   ≠ wne 3018  ∀wral 3140  ∃wrex 3141   ∖ cdif 3935   ∪ cun 3936   ∩ cin 3937   ⊆ wss 3938  ∅c0 4293  ∪ ciun 4921  ‘cfv 6357  (class class class)co 7158   ↾_t crest 16696  TopOnctopon 21520  Conncconn 22021

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 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-rep 5192  ax-sep 5205  ax-nul 5212  ax-pow 5268  ax-pr 5332  ax-un 7463

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ne 3019  df-ral 3145  df-rex 3146  df-reu 3147  df-rab 3149  df-v 3498  df-sbc 3775  df-csb 3886  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-pss 3956  df-nul 4294  df-if 4470  df-pw 4543  df-sn 4570  df-pr 4572  df-tp 4574  df-op 4576  df-uni 4841  df-int 4879  df-iun 4923  df-br 5069  df-opab 5131  df-mpt 5149  df-tr 5175  df-id 5462  df-eprel 5467  df-po 5476  df-so 5477  df-fr 5516  df-we 5518  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-rn 5568  df-res 5569  df-ima 5570  df-pred 6150  df-ord 6196  df-on 6197  df-lim 6198  df-suc 6199  df-iota 6316  df-fun 6359  df-fn 6360  df-f 6361  df-f1 6362  df-fo 6363  df-f1o 6364  df-fv 6365  df-ov 7161  df-oprab 7162  df-mpo 7163  df-om 7583  df-1st 7691  df-2nd 7692  df-wrecs 7949  df-recs 8010  df-rdg 8048  df-oadd 8108  df-er 8291  df-en 8512  df-fin 8515  df-fi 8877  df-rest 16698  df-topgen 16719  df-top 21504  df-topon 21521  df-bases 21556  df-cld 21629  df-conn 22022

This theorem is referenced by:  unconn  22039  conncompconn  22042