(mathematics) Any of a class of functions that are solutions to a particular form of differential equation (a Bessel equation) and are typically used to describe waves in a cylindrically symmetric system.

(mathematics) Any of class of special functions, usually denoted as two pairs of functions berₙ(x), beiₙ(x), kerₙ(x) and keiₙ(x) with variable x and given order number n. The former two functions berₙ(x) and beiₙ(x) respectively correspond to the real part and the imaginary part of the Kelvin differential equation's solution that can be expressed with the Bessel function of the first kind Jₙ(x), and the latter kerₙ(x) and keiₙ(x) correspond to those that can be expressed with the modified Bessel function of the second kind Kₙ(x).

(mathematics) a function of the type f:V⨯V→V, or more generally, a function of the type f:U_1⨯U_2⨯...⨯U_n→V in which exactly two of the sets Uᵢ are equal to V.

A work that can be considered to be of practical use, such as software, encyclopedias, dictionaries and textbooks; it has no point of view and is non-fiction.

Any fresh or processed food claimed to have a health-promoting and/or disease-preventing property beyond the basic function of supplying nutrients

(mathematical analysis) a function whose value at any point in its domain is equal its limit at the same point

plural of homogenous function

plural of homogeneous function

plural of continuous function

(mathematics) A function whose domain is the empty set.