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$$
(P_{1})\left\{
    \begin{array}{ll}
    \max  &   \text{N}(W_{T + 1} \geq W)\\
     s.t.    &   \text{P}(R_{P,t} \geq {R_t}) \geq \theta,                         (1)\\
             &   \text{P}(SD(R_{P,t}) \leq {\delta_t}) \geq 0.2,                   (2)\\
             &   \sum\limits_{i = 1}^n {{x_{t,i}} = 1} ,                               (3)\\
\end{array}
  \right.
$$

[ Last edited by ¸ï¸ï007 on 2011-8-13 at 10:26 ]
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\begin{align}
\max  &\text{N}(W_{T + 1} \geq W)\\
     s.t.    &\text{P}(R_{P,t} \geq {R_t}) \geq \theta,        \label{1}\\
             &\text{P}(SD(R_{P,t}) \leq {\delta_t}) \geq 0.2,          \label{2}\\
             &\sum\limits_{i = 1}^n {{x_{t,i}} = 1} ,      \label{3}\\
\end{align}
2Â¥2011-08-13 10:57:04
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\usepackage{cases}

\begin{numcases}{(P_{1})}
    \max  & $\text{N}(W_{T + 1} \geq W)$\nonumber\\
     s.t. & $\text{P}(R_{P,t} \geq {R_t}) \geq \theta,$                           \\
          & $- \sum\limits_{i = 1}^n {{x_{t,i}}\ln {x_{t,i}} \geq d,} $             \\
          & $\sum\limits_{i = 1}^n {{x_{t,i}} = 1} ,   $                        
\end{numcases}
4Â¥2011-08-13 14:15:42
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