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.
If Set A contains{1, 2} and Set B contains {1, 2, 3, 4}, then A is a subset of B because each element of A, the numbers 1 and 2, are also elements of B. The empty set has no elements, so we can say that all the elements of the empty set are elements of any other set. Therefore, the empty set is a subset of any set.