## Question

###### Suppose that $f$ is a function of three independent variables $x, y$, and $z .$ Show that $D_{mathrm{i}} f=f_{x}, D_{mathrm{j}} f=f_{y}$, and $D_{mathrm{k}} f=f_{z}$

Suppose that $f$ is a function of three independent variables $x, y$, and $z .$ Show that $D_{mathrm{i}} f=f_{x}, D_{mathrm{j}} f=f_{y}$, and $D_{mathrm{k}} f=f_{z}$

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