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The Description Form, Roster Form, and The Set-Builder Notation Form.
Points on a grid? It would then be x,y and z coordinates
by congruence, difference, or by identifying w/c is greater or less
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There are two ways of describing, or specifying the members of, a set. One way is by intensional definition, using a rule or semantic description. See this example: A is the set whose members are the first four positive integers. B is the set of colors of the French flag. The second way is by extension, that is, listing each member of the set. An extensional definition is notated by enclosing the list of members in braces: C = {4, 2, 1, 3} D = {blue, white, red}