A mathematical expression is a sequence of symbols which can be evaluated. For example, if the symbols represent numbers, the expressions are evaluated according to a standard order of operations which provides for calculation, if feasible, of any expressions within parentheses, followed by any exponents and roots, then multiplications and divisions and finally any additions or subtractions, all completed from left to right. In a computer language, these rules are implemented by the compilers. For more on expression evaluation, see the computer science topics: keen evaluation, lazy evaluation, and evaluation operator.
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