A graphing calculator (10) or other computer based teaching tool that displays inequalities on a display screen. In contrast to prior art devices, the present invention provides displays of inequalities that are mathematically correct and consistent with non-electronic display of inequalities such as textbooks and black board representations to reinforce traditional teaching methods and help the student or user to readily see and understand the mathematical concepts involved. The display methods of the present invention are particularly useful for small, low-resolution displays that are typical of handheld computers and calculators.
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