My textbook (Taylor, Classical Mechanics) and professor introduced the concept of [itex]\nabla[/itex][itex]_{1}[/itex](adsbygoogle = window.adsbygoogle || []).push({});

to mean "the gradient of the function (potential energy) with respect to the position (x[itex]_{1}[/itex],y[itex]_{1}[/itex],z[itex]_{1}[/itex]) of particle 1.

I do not understand this. I am familiar with partial derivatives and gradients with respect to general x,y,and z, but not with respect to a fixed point. I could not find anything from my calculus book to help.

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# Gradient WRT a point.

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