A_t,\langle X,Y\rangle _t
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Recent Referers:
  1. http://formula.s21g.com/?A_t,%5Clangle%20X,Y%5Crangle%20_t
  2. https://mkprob.hatenablog.com/?page=1340878551
  3. https://formula.s21g.com/?A_t,%5Clangle%20X,Y%5Crangle%20...
  4. http://formula.s21g.com/
  5. http://d.hatena.ne.jp/mkprob/20120618