Ax=\sum_{j=1}^{\infty}\langle Ax,e_n\rangle e_n
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Recent Referers:
  1. http://formula.s21g.com/?Ax%3D%5Csum_%7Bj%3D1%7D%5E%7B%5C...
  2. https://mkprob.hatenablog.com/entry/20130220/1361363246
  3. https://mkprob.hatenablog.com/
  4. http://d.hatena.ne.jp/
  5. http://mkprob.hatenablog.com/entry/20130427/1367068675