Conceptual Graph
Conceptual graphs (CGs) are a formalism for knowledge representation. In the first published paper on CGs, John F. Sowa (Sowa 1976) used them to represent the conceptual schemas used in database systems. The first book on CGs (Sowa 1984) applied them to a wide range of topics in artificial intelligence, computer science, and cognitive science.
Since 1984, the model has been developed along three main directions.
Read more about Conceptual Graph: A Graphical Interface For First-order Logic, A Diagrammatic Calculus of Logics, A Graph-based Knowledge Representation and Reasoning Model
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