\mathbf{R}^*
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Recent Referers:
  1. http://formula.s21g.com/?%5Cmathbf%7BR%7D%5E*
  2. http://formula.s21g.com/
  3. http://mkprob.hatenablog.com/
  4. http://mkprob.hatenablog.com/?page=1327509307
  5. http://d.hatena.ne.jp/mkprob/?of=45