Set
Definition
A well-defined collection of distinct objects (called elements or members). Sets are denoted by capital letters and elements are listed within curly braces. Key operations include Union (∪), Intersection (∩), and Complement.
Example
"A = {1, 2, 3, 4, 5} and B = {4, 5, 6, 7}. Then A∪B = {1,2,3,4,5,6,7} and A∩B = {4,5}."