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Strange Symbol

  1. Nov 28, 2011 #1
    I just was wondering what is the meaning of this symbol
    It is used in the terminology of estimation of norms, I do not know if it is a standard notation, since I did not find anymore explanations. Also I do not know if there is a command to write it directly by LaTeX instead of "\stackrel{\smile}{\frown}".
    Thanks in advance.
  2. jcsd
  3. Nov 28, 2011 #2
    I just have found the symbol, so now the question is
    what does it mean?
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