"function" - key terms from Wikipedia

algebraic function
analytic function
beta function
characteristic function
computable function
continuous function
convex function
correlation function
cost function
cumulative distribution function
delta function
distribution function
error function
exponential function
function
function	keys
function	points
gamma function
generating function
hash function
holomorphic function
identity function
inverse function
kidney function
likelihood function
logistic function
loss function
mertens function	zero
objective 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
social welfare function
step function
transfer function
trigonometric function
utility function
wave function
wave function	collapse
window function
work function
zeta function