$System is a string describing the type of computer system on which Mathematica is being run.

$UserDocumentsDirectory gives your default "documents" directory.

Structural Operations on Polynomials Finding the Structure of a Polynomial Polynomial Orderings

[1] Mehrotra, S. "On the Implementation of a Primal-Dual Interior Point Method." SIAM Journal on Optimization 2 (1992): 575–601. [2] Nelder, J.A. and R. Mead. "A Simplex ...

Introduction to Editing Mathematica Graphics Drawing Tools Selecting Graphics Objects

A standard electronic calculator does all your calculations to a particular accuracy, say ten decimal digits. With Mathematica, however, you can often get exact results. ...

Picking out elements of lists. We will use this list for the examples. Here is the last element of t.

If you experience internet connectivity problems, such as trouble using Mathematica's integrated data functions, try following the troubleshooting techniques described below. ...

Type the symbol that will have the subscript. Type x. Create a subscript by pressing the Control key and the - key at the same time.

DatabaseLink provides a number of functions for connection to an SQL database. It also supports a resource mechanism that allows the details of how the connection is set up ...