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Noun

single-valued function - (mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function)

function, mapping, mathematical function, map

multinomial, polynomial - a mathematical function that is the sum of a number of terms

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)

expansion - a function expressed as a sum or product of terms; "the expansion of (a+b)^2 is a^2 + 2ab + b^2"

inverse function - a 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

isometry - a one-to-one mapping of one metric space into another metric space that preserves the distances between each pair of points; "the isometries of the cube"

operator - (mathematics) a symbol or function representing a mathematical operation

circular function, trigonometric function - function of an angle expressed as a ratio of the length 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