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In mathematics, the word expression is a term for any well-formed combination of mathematical symbols. An algebraic expression is only a phrase, not a whole sentence, so it cannot contain an equality sign (=).For a given combination of values for the free variables, an expression may be evaluated, although for some combinations of values of the free variables, the value of the expression may be undefined. Thus an expression represents a function whose inputs are the value assigned the free variables and whose output is the resulting value of the expression.