Here is an expression in full form. TreeForm prints out expressions to show their "tree" structure. You can think of any Mathematica expression as a tree. In the expression ...

Long used in its simplest form in mathematics, functional iteration is an elegant way to represent repeated operations. Mathematica's symbolic architecture makes powerful ...

The symbolic architecture of Mathematica notebooks allows immediate interoperability with a wide range of document, web, graphics and other formats. Mathematica automatically ...

Mathematica's sophisticated notebook paradigm provides a uniquely powerful way to manage, organize, document and present computations—from a few input and output lines, to ...

Mathematica uses its symbolic architecture to provide a convenient modular framework for generating and managing messages, both in programs and interactive sessions.

Mathematica's symbolic architecture makes possible a uniquely convenient approach to working with statistical models. Starting from arbitrary data, Mathematica generates ...

New creates a new notebook, slide show, Demonstration, package, or text document.

p_1 | p_2 | ... is a pattern object which represents any of the patterns p_i.

Majority[e_1, e_2, ...] gives True if the majority of the e_i are True, and False if the majority are False.

StringQ[expr] gives True if expr is a string, and False otherwise.