Set theory

Set theory is the study of sets in mathematics. Sets are collections of objects. We refer to these objects as "elements" or "members" of the set. To write a set, one wraps the numbers in {curly brackets}, and separates them with commas. For example. the set ${\displaystyle \{1,2,3\}}$ holds 1, 2, and 3. Sets are also often referred to using capital roman letters such as ${\displaystyle A}$, ${\displaystyle B}$, ${\displaystyle C}$.^[1]

There are three methods one can use to describe a set: Description method, Roster method (tabular form) and Rule method (set builder form).

1. ↑ "Comprehensive List of Set Theory Symbols". Math Vault. 2020-04-11. Retrieved 2020-08-20.