# Wolfram Language & System 10.0 (2014)|Legacy Documentation

This is documentation for an earlier version of the Wolfram Language.
WOLFRAM LANGUAGE GUIDE

# Numerical Functions

Throughout the Wolfram Language there is support not only for approximate real numbers, but also for exact numbers represented in algebraic or symbolic form. Functions like Floor, IntegerPart, and Max are all in effect set up to "prove theorems"often using original algorithms developed at Wolfram Researchto give values with exact inputs.

## Learning ResourcesLearning Resources

### Tutorials

Related Web Resources

Demonstrations

## ReferenceReference

Min, Max minimum or maximum of numbers or lists

Abs absolute value

Sign sign (, , )

Clip clip to between and or other limits

Rescale rescale to run between and

Chop chop small values to

Threshold set values in a list below a threshold to 0.

Unitize 0 for x0, and 1 otherwise

UnitStep 0 for , and 1 for

Piecewise general piecewise function

Boole 1 for True, 0 for False

DiscreteIndicator indicator function for a discrete set

Less(<)  ▪  Greater(>)  ▪  LessEqual(<=)  ▪  GreaterEqual (>=)

### Integer Functions »

IntegerQ test whether an expression is an integer