Q_n\stackrel{\rm def}{=}Q
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Recent Referers:
  1. http://formula.s21g.com/?Q_n%5Cstackrel%7B%5Crm%20def%7D%...
  2. https://mkprob.hatenablog.com/
  3. http://d.hatena.ne.jp/
  4. http://d.hatena.ne.jp/mkprob/?of=0
  5. http://d.hatena.ne.jp/mkprob/?via=201007