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Solution: Circulation $\Gamma $.


\begin{displaymath}\int\limits_{C_1 } {\mathord{\buildrel{\lower3pt\hbox{$\scrip... ...array}{c}\mbox{vortex} \\ \mbox{strenght}\end{array}}} \notag \end{displaymath}  


\begin{figure} \centering\epsfig{file=lfig1012.eps,height=2in,clip=}\end{figure}