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## 4 Relations## A conceptual graph is a bipartite graphIt will be remembered that a conceptual graph is a bipartite graph with two different kinds of nodes: - Concept nodes
- Relation nodes
We have already discussed concept nodes. Now we discuss the other kind, relation nodes. ## What are relations?If concepts can be likened to bricks in a wall, then relations can
be likened to the mortar that bonds the bricks together. Relations
For example, in the following graph, [Cat]->(On)->[Mat] "A cat is on a mat" the concepts "Cat" and "Mat" are related by the relation node "On". The concepts "Cat" and "Mat" are the "bricks" of the graph, while "On" is the "mortar" that binds the concepts together. ## NextWith this informal introduction in mind, we now gives some definitions that are useful when thinking and talking about relations. Prev: 3.5 Quiz: ConceptsUp: Part I: GraphsNext: 4.1 Definitions for relations |