\mathbf{R}
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Recent Referers:
  1. http://formula.s21g.com/?%5Cmathbf%7BR%7D
  2. http://formula.s21g.com/
  3. http://webcache.googleusercontent.com/search?q=cache:m1Nw...
  4. http://mkprob.hatenablog.com/?page=1330249108
  5. http://d.hatena.ne.jp/mkprob/20120118/1326896111