1 Partial differentiation and the chain rule
https://www.ucl.ac.uk/~ucahjva/multi4.pdf1 Partial differentiation and the chain rule In this section we review and discuss certain notations and relations involving partial derivatives. The more general case can be illustrated by considering a function f(x,y,z) of three variables x, y and z. If y and z are held constant and only x is allowed to vary, the partial derivative of f