Sqrt' in Mathematica

Question

I was taking a derivative in Mathematica and the result containted the term Sqrt', and I was wondering what the ' on the end ment? I believe in means 1/Sqrt from doing the derivative by hand but if someone could confirm this is how the result is displayed I would appreciate it. Here is my input and output.

 In    f[p_] := cSqrt[(m^2)*(c^2) + (p - eA/c)^2] + e*phi
 In    f'[p]
 Out    2 (-(eA/c) + p) Derivative[1][cSqrt][c^2 m^2 + (-(eA/c) + p)^2]

Best, Ben

Answer 1

This may help: http://blog.wolfram.com/2011/05/20/mathematica-qa-three-functions-for-computing-derivatives/

Apparently ' is the standard shorthand notation for the derivative.