Note 1 to entry: For a periodic function, the given interval has a range equal to the period.

Note 2 to entry: The term peak value is mostly used for the global maximum value of a function of time.

Note 3 to entry: A global maximum value of function f is denoted by ${\displaystyle f_{\text{m}\text{m}}}$ or $\widehat{\widehat{f}}$.