Constant Function

In mathematics, a constant function is a function whose values do not vary and thus are constant. For example the function f(x) = 4 is constant since f maps any value to 4. More formally, a function f : AB is a constant function if f(x) = f(y) for all x and y in A.

Every empty function is constant, vacuously, since there are no x and y in A for which f(x) and f(y) are different when A is the empty set.

In the context of polynomial functions, a non-zero constant function is called a polynomial of degree zero.

A function is said to be identically zero if it takes the value 0 for every argument; it is then trivially a constant function.

Read more about Constant Function:  Properties

Famous quotes containing the words constant and/or function:

    Sigh no more, ladies, sigh no more,
    Men were deceivers ever,
    One foot in sea and one on shore,
    To one thing constant never:
    Then sigh not so, but let them go,
    And be you blithe and bonny,
    Converting all your sounds of woe
    Into Hey nonny, nonny.
    William Shakespeare (1564–1616)

    The intension of a proposition comprises whatever the proposition entails: and it includes nothing else.... The connotation or intension of a function comprises all that attribution of this predicate to anything entails as also predicable to that thing.
    Clarence Lewis (1883–1964)