"function" - key terms from Wikipedia

analytic function
beta function
characteristic function
computable function
continuous function
convex function
cost function
cumulative distribution function
delta function
demand function
density function
distribution function
error function
executive function
exponential function
function
function	keys
gamma function
gaussian function
generating function
green's function
hash function
holomorphic function
hypergeometric function
inverse function
kidney function
likelihood function
loss function
mertens function
mertens function	zero
objective function
partition function
probability density function
probability mass function
production function
propositional function
rational function
recursive function
renal function
riemann zeta function
sinc function
smooth function
theta function
transfer function
trigonometric function
utility function
wave function
window function
work function
zeta function