Nest (Built-in Mathematica Symbol)

Nest[f, expr, n] gives an expression with f applied n times to expr.

Summary of New Features in Mathematica 8 (Mathematica Guide)

BooleanConvert (Built-in Mathematica Symbol)

BooleanConvert[expr] converts the Boolean expression expr to disjunctive normal form.BooleanConvert[expr, form] converts the Boolean expression expr to the specified ...

HeavisideTheta (Built-in Mathematica Symbol)

HeavisideTheta[x] represents the Heaviside theta function \[Theta](x), equal to 0 for x < 0 and 1 for x > 0. HeavisideTheta[x_1, x_2, ...] represents the multidimensional ...

CompiledFunction (Built-in Mathematica Symbol)

CompiledFunction[args...] represents compiled code for evaluating a compiled function.

CounterFunction (Built-in Mathematica Symbol)

CounterFunction is an option for counters that specifies the symbols used to display the value of the counter.

NearestFunction (Built-in Mathematica Symbol)

NearestFunction[data] represents a function whose values give the elements closest to an element that is supplied.

BesselK (Built-in Mathematica Symbol)

BesselK[n, z] gives the modified Bessel function of the second kind K_n (z).

TransformationFunction (Built-in Mathematica Symbol)

TransformationFunction[data] represents a transformation function that applies geometric and other transformations.

MultilineFunction (Built-in Mathematica Symbol)

MultilineFunction is an option for UnderscriptBox and related box objects that specifies what to do when the contents of a box object are too long to fit on one line.