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

plural of Riemann zeta function

(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.

(complex analysis) A complex function defined as E_𝛼,𝛽(z)=∑ₖ₌₀ ᪲(zᵏ)/(𝛤(𝛼k+𝛽)), where 𝛤(x) is the gamma function.

(medicine, virology) Medical research that alters an organism or disease in a way that increases pathogenesis, transmissibility, or host range.

(mathematics, computing theory) The mathematical function that maps each positive integer n to the number of steps required for the busy beaver among machines with two colors and n states to terminate.

plural of gain-of-function research

plural of iterated function system

(medicine) A form of magnetic resonance imaging that records the flow of blood to areas of the brain when the patient is undertaking a specific neural activity.