b(t,x)=\sum_{j=1}^nc_j(t,x)a_j(t,x),\quad \parallel b(t,x)\parallel^2=\sum_{j=1}^n|c_j(t,x)|^2
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Recent Referers:
  1. http://formula.s21g.com/?b(t,x)%3D%5Csum_%7Bj%3D1%7D%5Enc...
  2. https://mkprob.hatenablog.com/entry/20121101/1351746957
  3. http://formula.s21g.com/
  4. http://reader.livedoor.com/reader/
  5. http://mkprob.hatenablog.com/entry/2013/11/07/000227