Theorem connsubclo 23309

Description: If a clopen set meets a connected subspace, it must contain the entire subspace. (Contributed by Mario Carneiro, 10-Mar-2015.)

Hypotheses

Ref	Expression
connsubclo.1	⊢ 𝑋 = ∪ 𝐽
connsubclo.3	⊢ (𝜑 → 𝐴 ⊆ 𝑋)
connsubclo.4	⊢ (𝜑 → (𝐽 ↾t 𝐴) ∈ Conn)
connsubclo.5	⊢ (𝜑 → 𝐵 ∈ 𝐽)
connsubclo.6	⊢ (𝜑 → (𝐵 ∩ 𝐴) ≠ ∅)
connsubclo.7	⊢ (𝜑 → 𝐵 ∈ (Clsd‘𝐽))

Assertion

Ref	Expression
connsubclo	⊢ (𝜑 → 𝐴 ⊆ 𝐵)

Proof of Theorem connsubclo

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2729	. . . 4 ⊢ ∪ (𝐽 ↾t 𝐴) = ∪ (𝐽 ↾t 𝐴)
2		connsubclo.4	. . . 4 ⊢ (𝜑 → (𝐽 ↾t 𝐴) ∈ Conn)
3		connsubclo.7	. . . . . 6 ⊢ (𝜑 → 𝐵 ∈ (Clsd‘𝐽))
4		cldrcl 22911	. . . . . 6 ⊢ (𝐵 ∈ (Clsd‘𝐽) → 𝐽 ∈ Top)
5	3, 4	syl 17	. . . . 5 ⊢ (𝜑 → 𝐽 ∈ Top)
6		connsubclo.1	. . . . . . . 8 ⊢ 𝑋 = ∪ 𝐽
7	6	topopn 22791	. . . . . . 7 ⊢ (𝐽 ∈ Top → 𝑋 ∈ 𝐽)
8	5, 7	syl 17	. . . . . 6 ⊢ (𝜑 → 𝑋 ∈ 𝐽)
9		connsubclo.3	. . . . . 6 ⊢ (𝜑 → 𝐴 ⊆ 𝑋)
10	8, 9	ssexd 5263	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ V)
11		connsubclo.5	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ 𝐽)
12		elrestr 17332	. . . . 5 ⊢ ((𝐽 ∈ Top ∧ 𝐴 ∈ V ∧ 𝐵 ∈ 𝐽) → (𝐵 ∩ 𝐴) ∈ (𝐽 ↾t 𝐴))
13	5, 10, 11, 12	syl3anc 1373	. . . 4 ⊢ (𝜑 → (𝐵 ∩ 𝐴) ∈ (𝐽 ↾t 𝐴))
14		connsubclo.6	. . . 4 ⊢ (𝜑 → (𝐵 ∩ 𝐴) ≠ ∅)
15		eqid 2729	. . . . . 6 ⊢ (𝐵 ∩ 𝐴) = (𝐵 ∩ 𝐴)
16		ineq1 4164	. . . . . . 7 ⊢ (𝑥 = 𝐵 → (𝑥 ∩ 𝐴) = (𝐵 ∩ 𝐴))
17	16	rspceeqv 3600	. . . . . 6 ⊢ ((𝐵 ∈ (Clsd‘𝐽) ∧ (𝐵 ∩ 𝐴) = (𝐵 ∩ 𝐴)) → ∃𝑥 ∈ (Clsd‘𝐽)(𝐵 ∩ 𝐴) = (𝑥 ∩ 𝐴))
18	3, 15, 17	sylancl 586	. . . . 5 ⊢ (𝜑 → ∃𝑥 ∈ (Clsd‘𝐽)(𝐵 ∩ 𝐴) = (𝑥 ∩ 𝐴))
19	6	restcld 23057	. . . . . 6 ⊢ ((𝐽 ∈ Top ∧ 𝐴 ⊆ 𝑋) → ((𝐵 ∩ 𝐴) ∈ (Clsd‘(𝐽 ↾t 𝐴)) ↔ ∃𝑥 ∈ (Clsd‘𝐽)(𝐵 ∩ 𝐴) = (𝑥 ∩ 𝐴)))
20	5, 9, 19	syl2anc 584	. . . . 5 ⊢ (𝜑 → ((𝐵 ∩ 𝐴) ∈ (Clsd‘(𝐽 ↾t 𝐴)) ↔ ∃𝑥 ∈ (Clsd‘𝐽)(𝐵 ∩ 𝐴) = (𝑥 ∩ 𝐴)))
21	18, 20	mpbird 257	. . . 4 ⊢ (𝜑 → (𝐵 ∩ 𝐴) ∈ (Clsd‘(𝐽 ↾t 𝐴)))
22	1, 2, 13, 14, 21	connclo 23300	. . 3 ⊢ (𝜑 → (𝐵 ∩ 𝐴) = ∪ (𝐽 ↾t 𝐴))
23	6	restuni 23047	. . . 4 ⊢ ((𝐽 ∈ Top ∧ 𝐴 ⊆ 𝑋) → 𝐴 = ∪ (𝐽 ↾t 𝐴))
24	5, 9, 23	syl2anc 584	. . 3 ⊢ (𝜑 → 𝐴 = ∪ (𝐽 ↾t 𝐴))
25	22, 24	eqtr4d 2767	. 2 ⊢ (𝜑 → (𝐵 ∩ 𝐴) = 𝐴)
26		sseqin2 4174	. 2 ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐵 ∩ 𝐴) = 𝐴)
27	25, 26	sylibr 234	1 ⊢ (𝜑 → 𝐴 ⊆ 𝐵)

Syntax hints:   → wi 4   ↔ wb 206   = wceq 1540   ∈ wcel 2109   ≠ wne 2925  ∃wrex 3053  Vcvv 3436   ∩ cin 3902   ⊆ wss 3903  ∅c0 4284  ∪ cuni 4858  ‘cfv 6482  (class class class)co 7349   ↾_t crest 17324  Topctop 22778  Clsdccld 22901  Conncconn 23296

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 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5218  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371  ax-un 7671

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-reu 3344  df-rab 3395  df-v 3438  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-pss 3923  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-int 4897  df-iun 4943  df-br 5093  df-opab 5155  df-mpt 5174  df-tr 5200  df-id 5514  df-eprel 5519  df-po 5527  df-so 5528  df-fr 5572  df-we 5574  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-ima 5632  df-ord 6310  df-on 6311  df-lim 6312  df-suc 6313  df-iota 6438  df-fun 6484  df-fn 6485  df-f 6486  df-f1 6487  df-fo 6488  df-f1o 6489  df-fv 6490  df-ov 7352  df-oprab 7353  df-mpo 7354  df-om 7800  df-1st 7924  df-2nd 7925  df-en 8873  df-fin 8876  df-fi 9301  df-rest 17326  df-topgen 17347  df-top 22779  df-topon 22796  df-bases 22831  df-cld 22904  df-conn 23297

This theorem is referenced by:  conncn  23311  conncompclo  23320