Pinellas County is a county located in the state of Florida. As of the 2010 census, the population was 916,542. Its county seat is Clearwater, and its largest city is St. Petersburg. Pinellas County is included in the TampaâSt. PetersburgâClearwater, Florida Metropolitan Statistical Area.
Nowadays, we can say in plain English: A set is a well defined collection of objects. The elements or members of a set can be anything: numbers, characters, words, names, letters of the alphabet, even other sets, and so on.
The Empty Set and Set Equality. This lesson is part of a series of lessons on sets. In this lesson, we will learn how to define sets, the empty set, equal sets, subset, superset, proper subset, and proper superset. The Null set or Empty set. There are some sets that do not contain any element at all. For example, the set of months with 32 days. We call a set with no elements the null or empty set. It is represented by the symbol { } or Ã¸ . The set of dogs with six legs. The set of squares with 5 sides. The set of cars with 20 doors.