👉 Set theory is a foundational branch of mathematics that deals with collections of objects, known as sets. These collections can contain any type of entity—numbers, letters, people, or even other sets—and are defined by their membership criteria. Basic operations in set theory include union (combining elements from two or more sets), intersection (finding common elements between sets), and difference (elements in one set but not another). Set theory also introduces concepts like subsets, power sets, and cardinality, which measure the size of sets. It serves as a crucial framework for more advanced mathematical disciplines, providing a structured way to reason about collections and their relationships.
