f\in C^2(\mathbf{R}^d)
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Recent Referers:
  1. http://formula.s21g.com/?f%5Cin%20C%5E2(%5Cmathbf%7BR%7D%...
  2. http://d.hatena.ne.jp/mkprob/20130220/1361363246
  3. http://d.hatena.ne.jp/mkprob/touch/20121114
  4. http://reader.livedoor.com/reader/
  5. http://mkprob.hatenablog.com/entry/2013/11/07/000227