Let A = {a, b, c}, B = {a, c, d, e}, and C = {a, d, f, g}. Find the indicated set A ∩ B.

Key Concepts

Set Intersection

Set intersection is a fundamental operation in set theory that identifies the common elements between two or more sets. For sets A and B, the intersection, denoted as A ∩ B, includes all elements that are present in both sets. Understanding this concept is crucial for solving problems involving multiple sets and their relationships.

Set Notation

Set notation is a way to represent sets and their operations using specific symbols and terminology. Common symbols include curly braces for sets, the intersection symbol (∩) for common elements, and the union symbol (∪) for all elements from both sets. Familiarity with set notation is essential for accurately interpreting and solving set-related problems.

Element Membership

Element membership refers to the relationship between an element and a set, indicating whether the element is part of the set. This is denoted by the symbol '∈', meaning 'is an element of'. Understanding element membership is vital for determining the contents of sets and performing operations like intersection, as it helps identify which elements belong to both sets involved.