Binary decision diagram

A Binary Decision Diagram (BDD) is a data structure used to represent and manipulate Boolean functions efficiently. It is a directed acyclic graph where each node represents a variable, and the edges indicate the outcomes of variable assignments, leading to terminal nodes that represent the function's output (true or false). BDDs are particularly useful in various applications, including hardware verification, model checking, and optimization, due to their ability to compactly represent large sets of Boolean expressions and facilitate efficient operations on them. Their size can vary significantly based on the variable ordering, making the choice of ordering crucial for performance.