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 \begin{equation}
   C = \mathop{\argmax}_{c}{\sum_t{w^t_c}}%find how to write down the scripts.
 \end{equation}
 
 % latex.codecogs.com/eqneditor/editor.php
 
 % http://tex.stackexchange.com/questions/83169/commands-argmin-and-argmax-in-algorithm
 
\begin{algorithm}
\newcommand*{\argmax}{\operatornamewithlimits{argmax}\limits}
$k = \argmax\limits_{i} |R_i|$. % \arg\max_i S(R_i)
\end{algorithm}