$Input is a global variable whose value is the name of the stream from which input to Mathematica is currently being sought.

$MaxPiecewiseCases gives the maximum number of cases to allow in explicit Piecewise objects generated by expanding any single piecewise function.

$Notebooks is True if Mathematica is being used with a notebook-based front end.

$ProcessorType is a string giving the architecture of the processor on which Mathematica is being run.

$SyntaxHandler is a global variable which, if set, is applied to any input string that is found to contain a syntax error.

Depending on the purpose for which you are using a Mathematica notebook, you may want to change its overall appearance. The front end allows you to specify independently the ...

This dialog displays information regarding the editing times of the input notebook. This is a "live" dialog that dynamically updates as changes are made to the notebook. It ...

On most computer systems, Mathematica can produce not only graphics but also sound. Mathematica treats graphics and sound in a closely analogous way. For example, just as you ...

There are four kinds of bracketing used in Mathematica. Each kind of bracketing has a very different meaning. It is important that you remember all of them. The four kinds of ...

The function FindRoot has a Jacobian option; the functions FindMinimum, FindMaximum, and FindFit have a Gradient option; and the "Newton" method has a method option Hessian. ...