Expression

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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 $\displaystyle\sum^{5}_{k=1}kx$, $x$ is a free variable, but $k$ is bound.

Two expressions are equivalent if they represent the same function. Equivalence is represented by an equal sign (=).

See Also