\xi_{t_j}
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Recent Referers:
  1. http://formula.s21g.com/?%5Cxi_%7Bt_j%7D
  2. http://formula.s21g.com/
  3. http://mkprob.hatenablog.com/entries/2012/07/14
  4. http://mkprob.hatenablog.com/?page=1343480443
  5. http://d.hatena.ne.jp/mkprob/touch/20120714