(management) Any secondary business activity that supports the line functions of a business, but does not directly affect customers or profits

(mathematics) A generalization of the indicator function for a fuzzy set which assigns a truth value (0 or 1) to each element.

(mathematics) Either of a pair of functions that have the same domain and that the values of one are equal to or greater than the other for all points in that domain.

(chemistry) The relationship between the acidity of a solution and the concentration of its solute.

(mathematics) A function whose value is the same for all the elements of its domain.

(mathematics) Any function in which the interchange of two independent variables changes the sign of the dependent variable.

(mathematics) An inverse hyperbolic function

(algebraic geometry) Informally, any function expressible using (only) the operations of addition, subtraction, multiplication, division and raising to a rational power; more precisely, any continuous function definable as the root of some polynomial equation.

(mathematics) an inverse trigonometric function

(mathematics) Any function whose value is zero except for a finite part of its argument for which it has a constant non-zero value