Chapter 3 - Derivatives - 3.1 Introducing the Derivative - 3.1 Execises - Page 133: 4

For the given function $f$ the symbol $f'$ represents the derivative function of the function $f$.

For the given function $f$ the symbol $f'$ represents the derivative function of the function $f$. This is the mapping, similarly as $f$ in contrast to $f(x)$ and $f'(x)$ which are the values of those functions at $x$.