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A description of a function in terms of big O notation usually only provides an upper bound on the growth rate of the function.Īssociated with big O notation are several related notations, using the symbols o, Ω, ω, and Θ, to describe other kinds of bounds on asymptotic growth rates. The letter O is used because the growth rate of a function is also referred to as the order of the function. Big O notation is also used in many other fields to provide similar estimates.īig O notation characterizes functions according to their growth rates: different functions with the same asymptotic growth rate may be represented using the same O notation. In analytic number theory, big O notation is often used to express a bound on the difference between an arithmetical function and a better understood approximation a famous example of such a difference is the remainder term in the prime number theorem. In computer science, big O notation is used to classify algorithms according to how their run time or space requirements grow as the input size grows.

The letter O was chosen by Bachmann to stand for Ordnung, meaning the order of approximation.

Big O is a member of a family of notations invented by German mathematicians Paul Bachmann, Edmund Landau, and others, collectively called Bachmann–Landau notation or asymptotic notation. Big O notation is a mathematical notation that describes the limiting behavior of a function when the argument tends towards a particular value or infinity.

O&O Defrag Pro 27.0.8042 for ios instal free