Are two 'teams' stronger than one? This 'rotation' of judges means that Christina Aguilera and Cee Lo Green will return alongside Adam Levine and Blake Shelton for season 5 in the fall -- while Usher and Shakira will take season 6 in the spring of 2014.
A rule or rule set is a statement that tells browsers how to render particular elements on an HTML page. A rule set consists of a selector followed by a declaration block. The selector selects the elements on an HTML page that are affected by the rule set.
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.