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
ac.PNG
 
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Thread 'Help with Time-Independent Perturbation Theory "Good" States Proof'

Thread 'Help with Time-Independent Perturbation Theory "Good" States Proof'

(Disclaimer: this is not a HW question. I am self-studying, and this felt like the type of question I've seen in this forum. If there is somewhere better for me to share this doubt, please let me know and I'll transfer it right away.) I am currently reviewing Chapter 7 of Introduction to QM by Griffiths. I have been stuck for an hour or so trying to understand the last paragraph of this proof (pls check the attached file). It claims that we can express Ψ_{γ}(0) as a linear combination of...
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