A set which contains only two members is called a pair set. If a set has only one element, it's known as singleton set. By default std::set uses the operator < for comparing two elements and but if user passes the external sorting criteria i.e. Universal Set: The set of all objects under consideration is the universal set for that discussion. Even the null set is considered to be the subset of another set. The purpose of using sets is to represent the collection of relevant objects in a group. In these examples, certain conventions were used. Since a set is usually represented by the capital letter. If A is not a subset of B, then it is denoted as A⊄B. (b) Clearly there is no whole number less than 0. The elements of sets are the numbers, objects, symbols, etc contained in a set. A set is represented by a capital letter. For example: {1,2,3,4} is a set of numbers. If set A and set B are two sets, then set A difference set B is a set which has elements of A but no elements of B. A mathematical example of a set whose elements are named according to a rule might be: {x is a natural number, x < 10} If you're going to be technical, you can use full "set-builder notation" to express the above mathematical set. Python Set Operations. Each object or number in a set is called a member or element of the set. Set Notation The members(elements) of set is separated by comma and braces { } are used outside the comma separated elements. The order of set is also known as the cardinality. [ + of] I might need a spare set of clothes. Element of a set. Also, set a good or bad example. 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