Definition:Derivative/Higher Derivatives/Second Derivative/Notation/Newton Notation

's Notation for Second Derivative
's notation for the second derivative of a function $y = f \left({t}\right)$ with respect to the independent variable $t$ is:
 * $\ddot f \left({t}\right)$

or:
 * $\ddot y$

This notation is usually reserved for the case where the independent variable is time.