A=\{(a,b,t)\in \mathbf{R}^3\ |\ a<b,\ t\in \mathbf{R}\}
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Recent Referers:
  1. http://formula.s21g.com/?A%3D%5C%7B(a,b,t)%5Cin%20%5Cmath...
  2. https://mkprob.hatenablog.com/entry/20120118/1326896111
  3. http://formula.s21g.com/
  4. http://mkprob.hatenablog.com/category/%E5%B9%BE%E4%BD%95
  5. http://d.hatena.ne.jp/mkprob/?of=45