math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement

mathematical relation - a relation between mathematical expressions (such as equality or inequality)

inverse function - the function obtained by expressing the dependent variable of one function as the independent variable of another; f and g are inverse functions if f(x)=y and g(y)=x

Kronecker delta - a function of two variables i and j that equals 1 when i=j and equals 0 otherwise

metric, metric function - a function of a topological space that gives, for any two points in the space, a value equal to the distance between them

transformation - (mathematics) a function that changes the position or direction of the axes of a coordinate system

mapping, map, correspondence - a function such that for every element of one set there is a unique element of another set

operator - (mathematics) a symbol that represents a function from functions to functions; "the integral operator"

circular function, trigonometric function - function of an angle expressed as a ratio of the sides of right-angled triangle containing the angle

threshold function - a function that takes the value 1 if a specified function of the arguments exceeds a given threshold and 0 otherwise

exponential, exponential function - a function in which an independent variable appears as an exponent