Question: The stream function for an incompressible, two-dimensional flow field is [ psi=a y-b y^{3} ] where (a) and (b) are constants. Is this an irrotational

The stream function for an incompressible, two-dimensional flow field is

\[ \psi=a y-b y^{3} \]

where \(a\) and \(b\) are constants. Is this an irrotational flow? Explain.

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