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

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

Note 3 to entry: A global minimum value of function f is denoted by ${\displaystyle f_{\text{v}}}$ or $\stackrel{⌣}{\stackrel{⌣}{f}}$.