(u,x)\in \mathbf{R}_+\times E,\quad A\times B\in \mathcal{B}(\mathbf{R}_+)\times \mathcal{E}
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  1. http://formula.s21g.com/?(u,x)%5Cin%20%5Cmathbf%7BR%7D_+%...
  2. http://formula.s21g.com/
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  4. http://mkprob.hatenablog.com/entry/2013/11/07/000227
  5. http://d.hatena.ne.jp/mkprob/