Statements
![{\displaystyle x{\frac {\partial f}{\partial x}}(p,q,r)+y{\frac {\partial f}{\partial y}}(p,q,r)+z{\frac {\partial f}{\partial z}}(p,q,r)=0}](https://wikimedia.org/api/rest_v1/media/math/render/svg/361cc6a85a5b7383a58f2c5d33f4e323319c68e8)
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