S=\inf\{ t\geq 0 | M_t\geq x\}
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Recent Referers:
  1. http://formula.s21g.com/?S%3D%5Cinf%5C%7B%20t%5Cgeq%200%2...
  2. https://mkprob.hatenablog.com/entry/20120726/1343262108
  3. http://formula.s21g.com/
  4. http://d.hatena.ne.jp/mkprob/touch/20120726/1343262108
  5. http://mkprob.hatenablog.com/?page=1343480443