Problem Descriptor Reference > The Elements of a Descriptor > Operators

The following operators may be used in constructing conditional expressions:

Relational Operators

Operator	Definition
=	Equal to
<	Less than
>	Greater than
<=	Less than or equal to
>=	Greater than or equal to
<>	Not equal to

Relational Combinations

Operator	Definition
AND	Both conditions true
OR	Either condition true
NOT	(Unary) reverses condition

Assignment Operator

In addition to its use as an equal operator, problem descriptors use the '=' symbol to assign (associate) values functions and expressions with defined names.