I am trying to understand the derivation of the divergence formula in cylindrical coordinates. www.csupomona.edu/~ajm/materials/delcyl.pdf [Broken] paper does a good job of explaining it but I don't understand 2 things that the author does.(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\frac{\partial\hat{\rho}}{\partial\phi} = \hat{\phi}[/tex] and [tex]\frac{\partial\hat{\phi}}{\partial\phi} = \hat{\rho}[/tex]

Derivation is on page 3.

Can anyone help me understand this?

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# Divergence in cylindrical coordinate system

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