# Understanding Equation Form

by strokebow
Tags: equation, form
 P: 101 Hi, Example: Maxwell Relation (thermoD)... ($\frac{∂μ}{∂T}$)$_{p,n}$ = - ($\frac{∂S}{∂n}$)$_{T,p}$ what does it mean having those subscript variables outside of the brackets. thanks
 Mentor P: 10,853 They are kept constant in the process. For example, the left side is the change of µ if you change T, but keep p and n constant.
 P: 5,462 post#2 of http://www.physicsforums.com/showthread.php?t=666011 gives an example of the use of this for deriving one of Maxwells relations Have you studied partial differentiation?

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