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If I define [tex] z_\mu = \frac{\partial{\phi}}{\partial{x^{\mu}}}, \, \mu = 0,1,...,n [/tex], (for some scalar function phi of x=(x_0,...,x_n)) how is then [tex] \frac{\partial{}}{\partial{z_{\mu}}} [/tex] defined or rather what is it equal to? How would you call this expression? the inverse of a differential?

Thank you.

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# B Inverse of a differential?

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