(aerodynamics) A function describing the angle through which a flow can turn isentropically for the given initial and final Mach number.

plural of probability density function

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

(mathematics) A certain arithmetic function that is neither multiplicative nor additive. It is denoted by Λ(n) and defined as :𝛬(n)= log p mbox ifn=pᵏ mbox forsomeprimep mbox andintegerk>1,\0 mbox otherwise.

(mathematics) A formal power series with one indeterminate, whose coefficients are fractions with factorial denominators (of index corresponding to the power of the indeterminate) and numerators which represent a sequence of numbers that is to be studied.

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

plural of inverse trigonometric function

plural of user-defined function

plural of non-functional requirement

(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.