A\in\Sigma\Rightarrow A^C\in\Sigma
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  1. http://formula.s21g.com/?A%5Cin%5CSigma%5CRightarrow%20A%...
  2. http://formula.s21g.com/?A%5Cin%5CSigma%5CRightarrow%20A%...
  3. http://maron8676.hatenablog.jp/entry/2015/01/20/025813
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