S: (n) expansion (a function expressed as a sum or product of terms) "the expansion of (a+b)^2 is a^2 + 2ab + b^2"
S: (n) 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)
S: (n) Kronecker delta (a function of two variables i and j that equals 1 when i=j and equals 0 otherwise)
S: (n) metric function, metric (a function of a topological space that gives, for any two points in the space, a value equal to the distance between them)
S: (n) transformation ((mathematics) a function that changes the position or direction of the axes of a coordinate system)
S: (n) 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"
S: (n) operator ((mathematics) a symbol or function representing a mathematical operation)
S: (n) parity ((mathematics) a relation between a pair of integers: if both integers are odd or both are even they have the same parity; if one is odd and the other is even they have different parity) "parity is often used to check the integrity of transmitted data"
S: (n) transitivity ((logic and mathematics) a relation between three elements such that if it holds between the first and second and it also holds between the second and third it must necessarily hold between the first and third)