$Urgent (Built-in Mathematica Symbol)

$Urgent gives the list of files and pipes to which urgent output from Mathematica is sent.

$UserDocumentsDirectory (Built-in Mathematica Symbol)

$UserDocumentsDirectory gives your default "documents" directory.

$Version (Built-in Mathematica Symbol)

$Version is a string that gives the version of the Mathematica kernel you are running.

Advanced Topics in Algebra (Mathematica Overview)

Complex Polynomial Systems Real Polynomial Systems Diophantine Polynomial Systems

Algebraic Calculations (Mathematica Overview)

Symbolic Computation Values for Symbols Transforming Algebraic Expressions

Automatic Numbering (Mathematica Tutorial)

Two ways to set up automatic numbering in a Mathematica notebook. These cells are in DisplayFormulaNumbered style. DisplayFormulaNumbered style is available in the default ...

Core Language (Mathematica Overview)

"How to" Topics Building Up Calculations Lists

Dynamic Interactivity How to Topics (Mathematica Overview)

Create Animations Build an Interactive Application Import and Export Animations

Functional Operations (Mathematica Overview)

Function Names as Expressions Applying Functions Repeatedly Applying Functions to Lists and Other Expressions

Graphics and Sound (Mathematica Overview)

Basic Plotting Options for Graphics Redrawing and Combining Plots