Some people find it helpful to think of the domain and range as people in romantic relationships if each number in the domain is a person and each number in the range is a different person then a function is when all of the people in the domain have 1 and only 1 boyfriend girlfriend in the range compare the two relations on the below they . Improve your math knowledge with free questions in domain and range of relations and thousands of other math skills. When functions are first introduced you will probably have some simplistic functions and relations to deal with usually being just sets of points these wont be terribly useful or interesting functions and relations but your text wants you to get the idea of what the domain and range of a function are. Now let us see the domain and range of functions and relations in detail you can read the introductory post about relations and functions here introduction to relations and functions domain of a relation the domain is the set of inputs to a function or x coordinates in the ordered pairs all valid inputs. Functions versus relations page 1 of 2 sections functions versus relations domain and range there are different ways of looking at functions we will consider a few but first we need to discuss some terminology a relation is just a relationship between sets of information
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