User Guide

Note: In 1-D Math input, enter , , and using the <>, <=, and
>= operators.
The evalb command uses a three-valued logic system. The return values are
true, false, and FAIL. If evaluation is not possible, an unevaluated expression
is returned.
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Important: The evalb command does not perform arithmetic for inequalities
involving <, , >, or , and does not simplify expressions. Ensure
that you perform these operations before using the evalb command.
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Levels of Evaluation
In a symbolic mathematics program such as Maple, you encounter the issue
of levels of evaluation. If you assign y to x, z to y, and then 5 to z, what is
the value of x?
7.3 Working with Maple Expressions • 315