A\subset \bigcup_{n=1}^{\infty} U_n,\quad B\subset \bigcup_{n=1}^{\infty} V_n
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  1. http://formula.s21g.com/?A%5Csubset%20%5Cbigcup_%7Bn%3D1%...
  2. https://mkprob.hatenablog.com/?page=1347467854
  3. https://mkprob.hatenablog.com/archive/2012/09/12
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