Solution
= Solution
For a <velocity potential> $\phi$, one requires $u=\partial_x\phi$ and $v=\partial_y\phi$. Integration gives
$$
\boxed{\phi(x,y)=-\frac{x}{x^2+y^2}},
$$
again up to an additive constant.
= Solution
For a <velocity potential> $\phi$, one requires $u=\partial_x\phi$ and $v=\partial_y\phi$. Integration gives
$$
\boxed{\phi(x,y)=-\frac{x}{x^2+y^2}},
$$
again up to an additive constant.