QuadraticIrrationalQ[x] gives True if x is a quadratic irrational and False otherwise.

Options associated with the interactive entering of expressions. The option SingleLetterItalics is typically set whenever a cell uses TraditionalForm. Here is an expression ...

RootOfUnityQ[a] yields True if a is a root of unity, and yields False otherwise.

WolframAlpha["query"] sends query to Wolfram|Alpha and imports the output.WolframAlpha["query", format] imports the output according to the specified format.

PolynomialReduce[poly, {poly_1, poly_2, ...}, {x_1, x_2, ...}] yields a list representing a reduction of poly in terms of the poly_i. The list has the form {{a_1, a_2, ...}, ...

Sometimes you may want to set up functions where certain arguments, if omitted, are given "default values". The pattern x_:v stands for an object that can be omitted, and if ...

When you install a MathLink-compatible external program using Install, the program is set up to behave somewhat like a simplified Mathematica kernel. Every time you call a ...

Dividers is an option for Grid and related constructs that specifies where and how to draw divider lines.

Mathematica has many powerful features which enable you to solve many kinds of equations.

Enabled is an option for objects such as Slider that specifies whether the objects should be enabled for interactive manipulation.