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.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Gradient WRT a point.

**Physics Forums | Science Articles, Homework Help, Discussion**