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Positive

Concept

Positive vs. Negative

Part of the description of any real number is its sign; it can be positive, negative, or zero. When discussing a set of numbers, it can sometimes be helpful to know how to describe the sign of all numbers within the set.

Positive

A real number is said to be positive if it is greater than

Non-negative

Sets of numbers that are non-negative can include not only positive numbers but also

Negative

Negative numbers are the opposite of positive numbers; a real number is said to be negative if it is less than Adding a positive number and its corresponding negative will result in a sum of

Non-positive

Similar to non-negative numbers, a set of numbers that are non-positive can include both negative numbers and

Graphical Representation

Each of these sets of numbers can be represented with a number line inequality.
Notice how the point at is closed when it is included in the set and open when it is not.