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J_{1}=\left[
\begin{array}{c}
1 \\
1 \\
\end{array}
\right]
\int\int_G{f(x,y) dxdy} = \int\int_{G1}{f(x,y) dxdy}+\int\int_{G2}{f(x,y) dxdy}
\begin{tabular}{|ccc|}
  \raisebox{1em}{A} & \shortstack{B1 \\ B2 \\ B3} & \raisebox{1em}{C}
\end{tabular}
\pi = \frac{\beta}{\omega+\beta^2}\{ (k-1)y^*+\beta\pi^e\}
y-y^* =\beta (\pi-\pi^e)