SET THEORY (PART 2)
Set theory is the branch of mathematics that deals with collections of objects, called sets. A set is a well-defined collection of distinct elements, often denoted by curly brackets, such as {1, 2, 3}. Elements can be numbers, letters, or objects. Basic operations in set theory include union (A ∪ B), intersection (A ∩ B), and difference (A – B). A subset is a set where all elements are contained within another set, written as A ⊆ B. Set theory is fundamental in mathematics, helping to define and study relations between different groups of objects.