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.
A real number is said to be positive if it is greater than
Sets of numbers that are non-negative can include not only positive numbers but also
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
Similar to non-negative numbers, a set of numbers that are non-positive can include both negative numbers and