In mathematics, a domain is the set of all possible values of the independent variable that make sense in the given situation. A reasonable domain is a set of values that are appropriate for the context of the problem being considered. For example, if we are considering the weight of a package being mailed, the domain would be 0 < w ≤ 3.5 ounces, since negative weights dont make sense and weights greater than 3.5 ounces would require a different mailing method.
Determining a reasonable domain can depend on the context of the problem and the values that make sense in that context. In general, a reasonable domain should include all values that are relevant to the problem being considered and exclude values that do not make sense in that context.
