Operator (mathematics)In mathematics, an operator is generally a mapping or function that acts on elements of a space to produce elements of another space (possibly and sometimes required to be the same space). There is no general definition of an operator, but the term is often used in place of function when the domain is a set of functions or other structured objects.
IntegralOperation in calculusA definite integral of a function can be represented as the signed area of the region bounded by its graph and the horizontal axis; in the above graph as an example, the integral of f(x){\displaystyle f(x)} between a{\displaystyle a} and b{\displaystyle b} is the yellow (−) area subtracted from the blue (+) area*As an Amazon Associate I earn from qualifying purchases.