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Expression Structure
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Built-in
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Everything Is an Expression
Specifying Types of Expression in Patterns
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Atomic Elements of Expressions
Expressions
Expression Structure
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Head
Head
[
expr
]
gives the head of
expr
.
EXAMPLES
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Basic Examples
(2)
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Generalizations & Extensions
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Applications
(2)
Properties & Relations
(1)
Possible Issues
(1)
Neat Examples
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SEE ALSO
Level
Part
Heads
TUTORIALS
Everything Is an Expression
Specifying Types of Expression in Patterns
MORE ABOUT
Atomic Elements of Expressions
Expressions
Expression Structure
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© 2008 Wolfram Research, Inc.
EXAMPLES
Basic Examples 
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