The Structure of Expressions
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Everything in Mathematica is an expression. Expressions are either atomic or composite and have a head and zero or more elements. The FullForm function gives the full internal representation of an expression and the TreeForm function shows its tree structure.
Contributed by: Xiang Li (October 2011)
Open content licensed under CC BY-NC-SA
"The Structure of Expressions"
Wolfram Demonstrations Project
Published: October 13 2011