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A transformation of a hypergeometric function,

A function of more than one variable.

For a discrete function f(n), the summatory function is defined by F(n)=sum_(k in D)^nf(k), where D is the domain of the function.

An unknown is an independent variable of a function. A function with n independent variables is said to be a function "in," "with," or "of" n unknowns.

An even Mathieu function ce_r(z,q) with characteristic value a_r.

A special function is a function (usually named after an early investigator of its properties) having a particular use in mathematical physics or some other branch of ...

A function f:A->B such that B is a set of numbers.

A function that has a natural boundary.

A function composed of a set of equally spaced jumps of equal length, such as the ceiling function f(x)=[x], floor function f(x)=|_x_|, or nearest integer function f(x)=[x].

The application of an apodization function.