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Theorem unconn 21561
Description: The union of two connected overlapping subspaces is connected. (Contributed by FL, 29-May-2014.) (Proof shortened by Mario Carneiro, 11-Jun-2014.)
Assertion
Ref Expression
unconn ((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ (𝐴𝐵) ≠ ∅) → (((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn) → (𝐽t (𝐴𝐵)) ∈ Conn))

Proof of Theorem unconn
Dummy variables 𝑥 𝑘 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 n0 4131 . . 3 ((𝐴𝐵) ≠ ∅ ↔ ∃𝑥 𝑥 ∈ (𝐴𝐵))
2 uniiun 4763 . . . . . . . . 9 {𝐴, 𝐵} = 𝑘 ∈ {𝐴, 𝐵}𝑘
3 simpl1 1243 . . . . . . . . . . . 12 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → 𝐽 ∈ (TopOn‘𝑋))
4 toponmax 21059 . . . . . . . . . . . 12 (𝐽 ∈ (TopOn‘𝑋) → 𝑋𝐽)
53, 4syl 17 . . . . . . . . . . 11 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → 𝑋𝐽)
6 simpl2l 1298 . . . . . . . . . . 11 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → 𝐴𝑋)
75, 6ssexd 5000 . . . . . . . . . 10 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → 𝐴 ∈ V)
8 simpl2r 1300 . . . . . . . . . . 11 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → 𝐵𝑋)
95, 8ssexd 5000 . . . . . . . . . 10 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → 𝐵 ∈ V)
10 uniprg 4642 . . . . . . . . . 10 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → {𝐴, 𝐵} = (𝐴𝐵))
117, 9, 10syl2anc 580 . . . . . . . . 9 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → {𝐴, 𝐵} = (𝐴𝐵))
122, 11syl5eqr 2847 . . . . . . . 8 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → 𝑘 ∈ {𝐴, 𝐵}𝑘 = (𝐴𝐵))
1312oveq2d 6894 . . . . . . 7 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → (𝐽t 𝑘 ∈ {𝐴, 𝐵}𝑘) = (𝐽t (𝐴𝐵)))
14 vex 3388 . . . . . . . . . 10 𝑘 ∈ V
1514elpr 4391 . . . . . . . . 9 (𝑘 ∈ {𝐴, 𝐵} ↔ (𝑘 = 𝐴𝑘 = 𝐵))
16 simpl2 1245 . . . . . . . . . 10 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → (𝐴𝑋𝐵𝑋))
17 sseq1 3822 . . . . . . . . . . . 12 (𝑘 = 𝐴 → (𝑘𝑋𝐴𝑋))
1817biimprd 240 . . . . . . . . . . 11 (𝑘 = 𝐴 → (𝐴𝑋𝑘𝑋))
19 sseq1 3822 . . . . . . . . . . . 12 (𝑘 = 𝐵 → (𝑘𝑋𝐵𝑋))
2019biimprd 240 . . . . . . . . . . 11 (𝑘 = 𝐵 → (𝐵𝑋𝑘𝑋))
2118, 20jaoa 979 . . . . . . . . . 10 ((𝑘 = 𝐴𝑘 = 𝐵) → ((𝐴𝑋𝐵𝑋) → 𝑘𝑋))
2216, 21mpan9 503 . . . . . . . . 9 ((((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) ∧ (𝑘 = 𝐴𝑘 = 𝐵)) → 𝑘𝑋)
2315, 22sylan2b 588 . . . . . . . 8 ((((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) ∧ 𝑘 ∈ {𝐴, 𝐵}) → 𝑘𝑋)
24 simpl3 1247 . . . . . . . . . . 11 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → 𝑥 ∈ (𝐴𝐵))
25 elin 3994 . . . . . . . . . . 11 (𝑥 ∈ (𝐴𝐵) ↔ (𝑥𝐴𝑥𝐵))
2624, 25sylib 210 . . . . . . . . . 10 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → (𝑥𝐴𝑥𝐵))
27 eleq2 2867 . . . . . . . . . . . 12 (𝑘 = 𝐴 → (𝑥𝑘𝑥𝐴))
2827biimprd 240 . . . . . . . . . . 11 (𝑘 = 𝐴 → (𝑥𝐴𝑥𝑘))
29 eleq2 2867 . . . . . . . . . . . 12 (𝑘 = 𝐵 → (𝑥𝑘𝑥𝐵))
3029biimprd 240 . . . . . . . . . . 11 (𝑘 = 𝐵 → (𝑥𝐵𝑥𝑘))
3128, 30jaoa 979 . . . . . . . . . 10 ((𝑘 = 𝐴𝑘 = 𝐵) → ((𝑥𝐴𝑥𝐵) → 𝑥𝑘))
3226, 31mpan9 503 . . . . . . . . 9 ((((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) ∧ (𝑘 = 𝐴𝑘 = 𝐵)) → 𝑥𝑘)
3315, 32sylan2b 588 . . . . . . . 8 ((((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) ∧ 𝑘 ∈ {𝐴, 𝐵}) → 𝑥𝑘)
34 simpr 478 . . . . . . . . . 10 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn))
35 oveq2 6886 . . . . . . . . . . . . 13 (𝑘 = 𝐴 → (𝐽t 𝑘) = (𝐽t 𝐴))
3635eleq1d 2863 . . . . . . . . . . . 12 (𝑘 = 𝐴 → ((𝐽t 𝑘) ∈ Conn ↔ (𝐽t 𝐴) ∈ Conn))
3736biimprd 240 . . . . . . . . . . 11 (𝑘 = 𝐴 → ((𝐽t 𝐴) ∈ Conn → (𝐽t 𝑘) ∈ Conn))
38 oveq2 6886 . . . . . . . . . . . . 13 (𝑘 = 𝐵 → (𝐽t 𝑘) = (𝐽t 𝐵))
3938eleq1d 2863 . . . . . . . . . . . 12 (𝑘 = 𝐵 → ((𝐽t 𝑘) ∈ Conn ↔ (𝐽t 𝐵) ∈ Conn))
4039biimprd 240 . . . . . . . . . . 11 (𝑘 = 𝐵 → ((𝐽t 𝐵) ∈ Conn → (𝐽t 𝑘) ∈ Conn))
4137, 40jaoa 979 . . . . . . . . . 10 ((𝑘 = 𝐴𝑘 = 𝐵) → (((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn) → (𝐽t 𝑘) ∈ Conn))
4234, 41mpan9 503 . . . . . . . . 9 ((((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) ∧ (𝑘 = 𝐴𝑘 = 𝐵)) → (𝐽t 𝑘) ∈ Conn)
4315, 42sylan2b 588 . . . . . . . 8 ((((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) ∧ 𝑘 ∈ {𝐴, 𝐵}) → (𝐽t 𝑘) ∈ Conn)
443, 23, 33, 43iunconn 21560 . . . . . . 7 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → (𝐽t 𝑘 ∈ {𝐴, 𝐵}𝑘) ∈ Conn)
4513, 44eqeltrrd 2879 . . . . . 6 (((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) ∧ ((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn)) → (𝐽t (𝐴𝐵)) ∈ Conn)
4645ex 402 . . . . 5 ((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ 𝑥 ∈ (𝐴𝐵)) → (((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn) → (𝐽t (𝐴𝐵)) ∈ Conn))
47463expia 1151 . . . 4 ((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋)) → (𝑥 ∈ (𝐴𝐵) → (((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn) → (𝐽t (𝐴𝐵)) ∈ Conn)))
4847exlimdv 2029 . . 3 ((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋)) → (∃𝑥 𝑥 ∈ (𝐴𝐵) → (((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn) → (𝐽t (𝐴𝐵)) ∈ Conn)))
491, 48syl5bi 234 . 2 ((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋)) → ((𝐴𝐵) ≠ ∅ → (((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn) → (𝐽t (𝐴𝐵)) ∈ Conn)))
50493impia 1146 1 ((𝐽 ∈ (TopOn‘𝑋) ∧ (𝐴𝑋𝐵𝑋) ∧ (𝐴𝐵) ≠ ∅) → (((𝐽t 𝐴) ∈ Conn ∧ (𝐽t 𝐵) ∈ Conn) → (𝐽t (𝐴𝐵)) ∈ Conn))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 385  wo 874  w3a 1108   = wceq 1653  wex 1875  wcel 2157  wne 2971  Vcvv 3385  cun 3767  cin 3768  wss 3769  c0 4115  {cpr 4370   cuni 4628   ciun 4710  cfv 6101  (class class class)co 6878  t crest 16396  TopOnctopon 21043  Conncconn 21543
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1891  ax-4 1905  ax-5 2006  ax-6 2072  ax-7 2107  ax-8 2159  ax-9 2166  ax-10 2185  ax-11 2200  ax-12 2213  ax-13 2377  ax-ext 2777  ax-rep 4964  ax-sep 4975  ax-nul 4983  ax-pow 5035  ax-pr 5097  ax-un 7183
This theorem depends on definitions:  df-bi 199  df-an 386  df-or 875  df-3or 1109  df-3an 1110  df-tru 1657  df-ex 1876  df-nf 1880  df-sb 2065  df-mo 2591  df-eu 2609  df-clab 2786  df-cleq 2792  df-clel 2795  df-nfc 2930  df-ne 2972  df-ral 3094  df-rex 3095  df-reu 3096  df-rab 3098  df-v 3387  df-sbc 3634  df-csb 3729  df-dif 3772  df-un 3774  df-in 3776  df-ss 3783  df-pss 3785  df-nul 4116  df-if 4278  df-pw 4351  df-sn 4369  df-pr 4371  df-tp 4373  df-op 4375  df-uni 4629  df-int 4668  df-iun 4712  df-br 4844  df-opab 4906  df-mpt 4923  df-tr 4946  df-id 5220  df-eprel 5225  df-po 5233  df-so 5234  df-fr 5271  df-we 5273  df-xp 5318  df-rel 5319  df-cnv 5320  df-co 5321  df-dm 5322  df-rn 5323  df-res 5324  df-ima 5325  df-pred 5898  df-ord 5944  df-on 5945  df-lim 5946  df-suc 5947  df-iota 6064  df-fun 6103  df-fn 6104  df-f 6105  df-f1 6106  df-fo 6107  df-f1o 6108  df-fv 6109  df-ov 6881  df-oprab 6882  df-mpt2 6883  df-om 7300  df-1st 7401  df-2nd 7402  df-wrecs 7645  df-recs 7707  df-rdg 7745  df-oadd 7803  df-er 7982  df-en 8196  df-fin 8199  df-fi 8559  df-rest 16398  df-topgen 16419  df-top 21027  df-topon 21044  df-bases 21079  df-cld 21152  df-conn 21544
This theorem is referenced by: (None)
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