Difference between revisions of "Expression"
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Revision as of 15:02, 4 November 2006
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In mathematics, an expression is a combination of numbers, variables, and operators that can be evaluated. Constants, such as e and pi, are commonly used in expressions.
Variables can be bound or free. For example, in the expression 
, 
is a free variable, but 
is bound.
Two expressions are equivalent if they represent the same function. Equivalence is represented by an equal sign (=).
