19. Transitive Closure of Relations
The chapter covers the concept of transitive closure in relations using graphical interpretations. The connectivity relationship is defined, showing how it is constructed through the union of powers of a relation. The naive algorithm for computing this transitive closure is introduced, emphasizing its significance in graph theory and practical applications like social networks.
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What we have learnt
- The transitive closure of a relation is equivalent to its connectivity relationship.
- A relation R defined over a finite set leads to the conclusion that R* is computed as the union of its first n powers.
- Graphical interpretations can illustrate connectivity in various contexts, such as social networks.
Key Concepts
- -- Transitive Closure
- The smallest transitive relation that contains a given relation R, indicating if paths exist between elements in R.
- -- Connectivity Relationship
- An abstraction where an element is related to itself if accessible by any path in a directed graph representation of the relation.
- -- Boolean Matrix
- A representation of a relation where each entry indicates the existence of a relation between elements, utilized for computing powers of relations.
- -- Naive Algorithm
- An algorithm to compute the transitive closure using successive Boolean matrix multiplications and disjunctions.
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