What Defines a Solenoidal Vector Field?

tweedle2
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Homework Statement
So I know how to work out if a vector field is incompressible normally, the divergence is 0. However I don't know how to do it for cylindrical or spherical coordinates, can anyone help me
Relevant Equations
Div f = 0
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Thread 'Product of two boosts and then two inverse boosts is rotation matrix'

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