"function" - key terms from Wikipedia

analytic function
beta function
brain function
characteristic function
continuous function
convex function
cost function
cumulative distribution function
delta function
differentiable function
distribution function
dominant function
error function
even function
exponential function
factorial function
function
function	keys
gamma function
generating function
hash function
holomorphic function
injective function
inverse function
kidney function
likelihood function
liver function
logistic function
mertens function	zero
objective function
odd function
partition function
periodic function
probability density function
production function
propositional function
quadratic function
rational function
renal function
riemann zeta function
sinc function
smooth function
step function
transfer function
trigonometric function
utility function
wave function
window function
work function
zeta function