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## Homework Statement

Hi

The stream function for a cylinder with radius [itex]a[/itex] in a uniform crosswind is given by (https://en.wikipedia.org/wiki/Potential_flow_around_a_circular_cylinder#Stream_function)

[tex]

\psi = Ur \sin(1-a^2/r^2)

[/tex]

How does one show this formally?