x\in \bigcap_{i=1}^nO_i
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  1. http://formula.s21g.com/?x%5Cin%20%5Cbigcap_%7Bi%3D1%7D%5...
  2. http://formula.s21g.com/
  3. http://d.hatena.ne.jp/mkprob/touch/searchdiary?word=%A5%B...
  4. http://d.hatena.ne.jp/mkprob/?of=16
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