iunconnlem2 - Mathbox for Alan Sare

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Theorem iunconnlem2 45671

Description: The indexed union of connected overlapping subspaces sharing a common point is connected. This proof was automatically derived by completeusersproof from its Virtual Deduction proof counterpart https://us.metamath.org/other/completeusersproof/iunconlem2vd.html. As it is verified by the Metamath program, iunconnlem2 45671 verifies https://us.metamath.org/other/completeusersproof/iunconlem2vd.html 45671. (Contributed by Alan Sare, 22-Apr-2018.) (Proof modification is discouraged.) (New usage is discouraged.)

**Hypotheses**
Ref	Expression
iunconnlem2.1	⊢ (𝜓 ↔ ((((((𝜑 ∧ 𝑢 ∈ 𝐽) ∧ 𝑣 ∈ 𝐽) ∧ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅) ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅) ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵)) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)))
iunconnlem2.2	⊢ (𝜑 → 𝐽 ∈ (TopOn‘𝑋))
iunconnlem2.3	⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ⊆ 𝑋)
iunconnlem2.4	⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝑃 ∈ 𝐵)
iunconnlem2.5	⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → (𝐽 ↾_t 𝐵) ∈ Conn)

**Assertion**
Ref	Expression
iunconnlem2	⊢ (𝜑 → (𝐽 ↾_t ∪ 𝑘 ∈ 𝐴 𝐵) ∈ Conn)

Distinct variable groups: 𝑢,𝑘,𝑣,𝜑 𝐴,𝑘,𝑢,𝑣 𝑢,𝐵,𝑣 𝑘,𝐽,𝑢,𝑣 𝑃,𝑘 𝑘,𝑋,𝑢,𝑣 Allowed substitution hints: 𝜓(𝑣, 𝑢, 𝑘) 𝐵(𝑘) 𝑃(𝑣, 𝑢)

Proof of Theorem iunconnlem2 Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		iunconnlem2.2	. 2 ⊢ (𝜑 → 𝐽 ∈ (TopOn‘𝑋))
2		iunconnlem2.3	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ⊆ 𝑋)
3	2	ex 417	. . . 4 ⊢ (𝜑 → (𝑘 ∈ 𝐴 → 𝐵 ⊆ 𝑋))
4	3	ralrimiv 3155	. . 3 ⊢ (𝜑 → ∀𝑘 ∈ 𝐴 𝐵 ⊆ 𝑋)
5		iunss 5008	. . . 4 ⊢ (∪ 𝑘 ∈ 𝐴 𝐵 ⊆ 𝑋 ↔ ∀𝑘 ∈ 𝐴 𝐵 ⊆ 𝑋)
6	5	biimpri 231	. . 3 ⊢ (∀𝑘 ∈ 𝐴 𝐵 ⊆ 𝑋 → ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ 𝑋)
7	4, 6	syl 18	. 2 ⊢ (𝜑 → ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ 𝑋)
8		iunconnlem2.1	. . . . . . . . . . . 12 ⊢ (𝜓 ↔ ((((((𝜑 ∧ 𝑢 ∈ 𝐽) ∧ 𝑣 ∈ 𝐽) ∧ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅) ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅) ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵)) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)))
9	8	biimpi 219	. . . . . . . . . . . . . . 15 ⊢ (𝜓 → ((((((𝜑 ∧ 𝑢 ∈ 𝐽) ∧ 𝑣 ∈ 𝐽) ∧ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅) ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅) ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵)) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)))
10	9	simprd 500	. . . . . . . . . . . . . 14 ⊢ (𝜓 → ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣))
11		simp-4r 795	. . . . . . . . . . . . . . . . . . 19 ⊢ (((((((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) ≠ ∅)
12	9, 11	syl 18	. . . . . . . . . . . . . . . . . 18 ⊢ (𝜓 → (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅)
13		n0 4306	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ↔ ∃𝑤 𝑤 ∈ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵))
14	13	biimpi 219	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ → ∃𝑤 𝑤 ∈ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵))
15	12, 14	syl 18	. . . . . . . . . . . . . . . . 17 ⊢ (𝜓 → ∃𝑤 𝑤 ∈ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵))
16		inss2 4189	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ⊆ ∪ 𝑘 ∈ 𝐴 𝐵
17		id 23	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑤 ∈ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) → 𝑤 ∈ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵))
18	16, 17	sselid 3934	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑤 ∈ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) → 𝑤 ∈ ∪ 𝑘 ∈ 𝐴 𝐵)
19		eliun 4959	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑤 ∈ ∪ 𝑘 ∈ 𝐴 𝐵 ↔ ∃𝑘 ∈ 𝐴 𝑤 ∈ 𝐵)
20	19	biimpi 219	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑤 ∈ ∪ 𝑘 ∈ 𝐴 𝐵 → ∃𝑘 ∈ 𝐴 𝑤 ∈ 𝐵)
21	18, 20	syl 18	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑤 ∈ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) → ∃𝑘 ∈ 𝐴 𝑤 ∈ 𝐵)
22		rexn0 4456	. . . . . . . . . . . . . . . . . . 19 ⊢ (∃𝑘 ∈ 𝐴 𝑤 ∈ 𝐵 → 𝐴 ≠ ∅)
23	21, 22	syl 18	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑤 ∈ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) → 𝐴 ≠ ∅)
24	23	exlimiv 1959	. . . . . . . . . . . . . . . . 17 ⊢ (∃𝑤 𝑤 ∈ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) → 𝐴 ≠ ∅)
25	15, 24	syl 18	. . . . . . . . . . . . . . . 16 ⊢ (𝜓 → 𝐴 ≠ ∅)
26		nfv 1943	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ Ⅎ𝑘(𝜑 ∧ 𝑢 ∈ 𝐽)
27		nfv 1943	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ Ⅎ𝑘 𝑣 ∈ 𝐽
28	26, 27	nfan 1928	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ Ⅎ𝑘((𝜑 ∧ 𝑢 ∈ 𝐽) ∧ 𝑣 ∈ 𝐽)
29		nfcv 2924	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ Ⅎ𝑘𝑢
30		nfiu1 4991	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ Ⅎ𝑘∪ 𝑘 ∈ 𝐴 𝐵
31	29, 30	nfin 4176	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ Ⅎ𝑘(𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵)
32		nfcv 2924	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ Ⅎ𝑘∅
33	31, 32	nfne 3060	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ Ⅎ𝑘(𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅
34	28, 33	nfan 1928	. . . . . . . . . . . . . . . . . . . . 21 ⊢ Ⅎ𝑘(((𝜑 ∧ 𝑢 ∈ 𝐽) ∧ 𝑣 ∈ 𝐽) ∧ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅)
35		nfcv 2924	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ Ⅎ𝑘𝑣
36	35, 30	nfin 4176	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ Ⅎ𝑘(𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵)
37	36, 32	nfne 3060	. . . . . . . . . . . . . . . . . . . . 21 ⊢ Ⅎ𝑘(𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅
38	34, 37	nfan 1928	. . . . . . . . . . . . . . . . . . . 20 ⊢ Ⅎ𝑘((((𝜑 ∧ 𝑢 ∈ 𝐽) ∧ 𝑣 ∈ 𝐽) ∧ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅) ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅)
39		nfcv 2924	. . . . . . . . . . . . . . . . . . . . 21 ⊢ Ⅎ𝑘(𝑢 ∩ 𝑣)
40		nfcv 2924	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ Ⅎ𝑘𝑋
41	40, 30	nfdif 4083	. . . . . . . . . . . . . . . . . . . . 21 ⊢ Ⅎ𝑘(𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵)
42	39, 41	nfss 3929	. . . . . . . . . . . . . . . . . . . 20 ⊢ Ⅎ𝑘(𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵)
43	38, 42	nfan 1928	. . . . . . . . . . . . . . . . . . 19 ⊢ Ⅎ𝑘(((((𝜑 ∧ 𝑢 ∈ 𝐽) ∧ 𝑣 ∈ 𝐽) ∧ (𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅) ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅) ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))
44		nfcv 2924	. . . . . . . . . . . . . . . . . . . 20 ⊢ Ⅎ𝑘(𝑢 ∪ 𝑣)
45	30, 44	nfss 3929	. . . . . . . . . . . . . . . . . . 19 ⊢ Ⅎ𝑘∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣)
46	43, 45	nfan 1928	. . . . . . . . . . . . . . . . . 18 ⊢ 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))
47	8	nfbii 1881	. . . . . . . . . . . . . . . . . 18 ⊢ (Ⅎ𝑘𝜓 ↔ 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)))
48	46, 47	mpbir 234	. . . . . . . . . . . . . . . . 17 ⊢ Ⅎ𝑘𝜓
49		simp-6l 798	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((((((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)
50	9, 49	syl 18	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝜓 → 𝜑)
51		iunconnlem2.4	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝑃 ∈ 𝐵)
52	50, 51	sylan 591	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜓 ∧ 𝑘 ∈ 𝐴) → 𝑃 ∈ 𝐵)
53	52	ex 417	. . . . . . . . . . . . . . . . 17 ⊢ (𝜓 → (𝑘 ∈ 𝐴 → 𝑃 ∈ 𝐵))
54	48, 53	ralrimi 3262	. . . . . . . . . . . . . . . 16 ⊢ (𝜓 → ∀𝑘 ∈ 𝐴 𝑃 ∈ 𝐵)
55		r19.2z 4459	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝐴 ≠ ∅ ∧ ∀𝑘 ∈ 𝐴 𝑃 ∈ 𝐵) → ∃𝑘 ∈ 𝐴 𝑃 ∈ 𝐵)
56	55	ancoms 463	. . . . . . . . . . . . . . . . 17 ⊢ ((∀𝑘 ∈ 𝐴 𝑃 ∈ 𝐵 ∧ 𝐴 ≠ ∅) → ∃𝑘 ∈ 𝐴 𝑃 ∈ 𝐵)
57	56	ancoms 463	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ≠ ∅ ∧ ∀𝑘 ∈ 𝐴 𝑃 ∈ 𝐵) → ∃𝑘 ∈ 𝐴 𝑃 ∈ 𝐵)
58	25, 54, 57	syl2anc 595	. . . . . . . . . . . . . . 15 ⊢ (𝜓 → ∃𝑘 ∈ 𝐴 𝑃 ∈ 𝐵)
59		eliun 4959	. . . . . . . . . . . . . . . 16 ⊢ (𝑃 ∈ ∪ 𝑘 ∈ 𝐴 𝐵 ↔ ∃𝑘 ∈ 𝐴 𝑃 ∈ 𝐵)
60	59	biimpri 231	. . . . . . . . . . . . . . 15 ⊢ (∃𝑘 ∈ 𝐴 𝑃 ∈ 𝐵 → 𝑃 ∈ ∪ 𝑘 ∈ 𝐴 𝐵)
61	58, 60	syl 18	. . . . . . . . . . . . . 14 ⊢ (𝜓 → 𝑃 ∈ ∪ 𝑘 ∈ 𝐴 𝐵)
62	10, 61	sseldd 3937	. . . . . . . . . . . . 13 ⊢ (𝜓 → 𝑃 ∈ (𝑢 ∪ 𝑣))
63		elun 4106	. . . . . . . . . . . . . 14 ⊢ (𝑃 ∈ (𝑢 ∪ 𝑣) ↔ (𝑃 ∈ 𝑢 ∨ 𝑃 ∈ 𝑣))
64	63	biimpi 219	. . . . . . . . . . . . 13 ⊢ (𝑃 ∈ (𝑢 ∪ 𝑣) → (𝑃 ∈ 𝑢 ∨ 𝑃 ∈ 𝑣))
65	62, 64	syl 18	. . . . . . . . . . . 12 ⊢ (𝜓 → (𝑃 ∈ 𝑢 ∨ 𝑃 ∈ 𝑣))
66	8, 65	sylbir 238	. . . . . . . . . . 11 ⊢ (((((((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))
67	50, 1	syl 18	. . . . . . . . . . . . . 14 ⊢ (𝜓 → 𝐽 ∈ (TopOn‘𝑋))
68	50, 2	sylan 591	. . . . . . . . . . . . . 14 ⊢ ((𝜓 ∧ 𝑘 ∈ 𝐴) → 𝐵 ⊆ 𝑋)
69		iunconnlem2.5	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → (𝐽 ↾_t 𝐵) ∈ Conn)
70	50, 69	sylan 591	. . . . . . . . . . . . . 14 ⊢ ((𝜓 ∧ 𝑘 ∈ 𝐴) → (𝐽 ↾_t 𝐵) ∈ Conn)
71		simp-6r 799	. . . . . . . . . . . . . . 15 ⊢ (((((((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)
72	9, 71	syl 18	. . . . . . . . . . . . . 14 ⊢ (𝜓 → 𝑢 ∈ 𝐽)
73		simp-5r 797	. . . . . . . . . . . . . . 15 ⊢ (((((((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)
74	9, 73	syl 18	. . . . . . . . . . . . . 14 ⊢ (𝜓 → 𝑣 ∈ 𝐽)
75		simpllr 787	. . . . . . . . . . . . . . 15 ⊢ (((((((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) ≠ ∅)
76	9, 75	syl 18	. . . . . . . . . . . . . 14 ⊢ (𝜓 → (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅)
77		simplr 780	. . . . . . . . . . . . . . 15 ⊢ (((((((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))
78	9, 77	syl 18	. . . . . . . . . . . . . 14 ⊢ (𝜓 → (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))
79	67, 68, 52, 70, 72, 74, 76, 78, 10, 48	iunconnlem 23595	. . . . . . . . . . . . 13 ⊢ (𝜓 → ¬ 𝑃 ∈ 𝑢)
80		incom 4161	. . . . . . . . . . . . . . 15 ⊢ (𝑣 ∩ 𝑢) = (𝑢 ∩ 𝑣)
81	80, 78	eqsstrid 3974	. . . . . . . . . . . . . 14 ⊢ (𝜓 → (𝑣 ∩ 𝑢) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵))
82		uncom 4111	. . . . . . . . . . . . . . 15 ⊢ (𝑣 ∪ 𝑢) = (𝑢 ∪ 𝑣)
83	10, 82	sseqtrrdi 3977	. . . . . . . . . . . . . 14 ⊢ (𝜓 → ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑣 ∪ 𝑢))
84	67, 68, 52, 70, 74, 72, 12, 81, 83, 48	iunconnlem 23595	. . . . . . . . . . . . 13 ⊢ (𝜓 → ¬ 𝑃 ∈ 𝑣)
85		pm4.56 1003	. . . . . . . . . . . . . . 15 ⊢ ((¬ 𝑃 ∈ 𝑢 ∧ ¬ 𝑃 ∈ 𝑣) ↔ ¬ (𝑃 ∈ 𝑢 ∨ 𝑃 ∈ 𝑣))
86	85	biimpi 219	. . . . . . . . . . . . . 14 ⊢ ((¬ 𝑃 ∈ 𝑢 ∧ ¬ 𝑃 ∈ 𝑣) → ¬ (𝑃 ∈ 𝑢 ∨ 𝑃 ∈ 𝑣))
87	86	idiALT 45215	. . . . . . . . . . . . 13 ⊢ ((¬ 𝑃 ∈ 𝑢 ∧ ¬ 𝑃 ∈ 𝑣) → ¬ (𝑃 ∈ 𝑢 ∨ 𝑃 ∈ 𝑣))
88	79, 84, 87	syl2anc 595	. . . . . . . . . . . 12 ⊢ (𝜓 → ¬ (𝑃 ∈ 𝑢 ∨ 𝑃 ∈ 𝑣))
89	8, 88	sylbir 238	. . . . . . . . . . 11 ⊢ (((((((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))
90	66, 89	pm2.65da 828	. . . . . . . . . 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))
91	90	ex 417	. . . . . . . . 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)))
92	91	ex 417	. . . . . . . 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))))
93	92	ex3 1364	. . . . . . 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)))))
94	93	3impd 1366	. . . . . 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)))
95	94	3expia 1138	. . . . 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))))
96	95	ex 417	. . . 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)))))
97	96	impd 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))))
98	97	ralrimivv 3205	. 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)))
99		connsub 23589	. . 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))))
100	99	biimp3ar 1498	. 2 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ 𝑋 ∧ ∀𝑢 ∈ 𝐽 ∀𝑣 ∈ 𝐽 (((𝑢 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑣 ∩ ∪ 𝑘 ∈ 𝐴 𝐵) ≠ ∅ ∧ (𝑢 ∩ 𝑣) ⊆ (𝑋 ∖ ∪ 𝑘 ∈ 𝐴 𝐵)) → ¬ ∪ 𝑘 ∈ 𝐴 𝐵 ⊆ (𝑢 ∪ 𝑣))) → (𝐽 ↾_t ∪ 𝑘 ∈ 𝐴 𝐵) ∈ Conn)
101	1, 7, 98, 100	syl3anc 1397	1 ⊢ (𝜑 → (𝐽 ↾_t ∪ 𝑘 ∈ 𝐴 𝐵) ∈ Conn)

Colors of variables: wff setvar class

This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 400 ∨ wo 860 ∧ w3a 1102 ∃wex 1808 Ⅎwnf 1812 ∈ wcel 2142 ≠ wne 2957 ∀wral 3078 ∃wrex 3088 ∖ cdif 3901 ∪ cun 3902 ∩ cin 3903 ⊆ wss 3904 ∅c0 4285 ∪ ciun 4955 ‘cfv 6536 (class class class)co 7412 ↾_t crest 17479 TopOnctopon 23078 Conncconn 23579

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-rep 5237 ax-sep 5256 ax-nul 5268 ax-pow 5335 ax-pr 5403 ax-un 7734

This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1103 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-nf 1813 df-sb 2096 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-reu 3369 df-rab 3416 df-v 3456 df-sbc 3744 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4487 df-pw 4563 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-int 4912 df-iun 4957 df-br 5109 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5555 df-eprel 5560 df-po 5568 df-so 5569 df-fr 5613 df-we 5615 df-xp 5666 df-rel 5667 df-cnv 5668 df-co 5669 df-dm 5670 df-rn 5671 df-res 5672 df-ima 5673 df-ord 6363 df-on 6364 df-lim 6365 df-suc 6366 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7861 df-1st 7984 df-2nd 7985 df-en 8942 df-fin 8945 df-fi 9369 df-rest 17481 df-topgen 17502 df-top 23062 df-topon 23079 df-bases 23114 df-cld 23187 df-conn 23580

This theorem is used by: iunconnALT 45672

W3C validator