Alternative spelling of Riemann zeta function

(computing) A requirement of a piece of software, such as accessibility or portability, that is not a specific, measurable aspect of performing a particular task.

(medicine) A test of the function of lungs, such as spirometry.

plural of non-functional requirement

(computing, database normalization) A functional dependency of an attribute on a superset of itself.

(mathematical analysis) A kind of linear functional which yields a non-negative scalar when given a non-negative function as parameter.

plural of programmed function key

plural of function-evaluation routine

plural of mathematical function program

(mathematics) A function of one real argument, whose value is zero when the argument is nonzero, and whose integral is one over any interval that includes zero.