- "England expects that every man will do his duty". -- Horatio Nelson

Sowa credits the **Existential Graphs** of Charles Sanders Peirce for his conceptual graphs. See also conceptual schema, semantic network, knowledge representation. Together with concepts like principal components analysis, Tuevo Kohonen's self-organizing map and Bayesian inference, Sowa's conceptual graphs may eventually make it possible to implement agentss for unsupervised learning.

Reference: John F. Sowa, *Conceptual Structures* 1984 IBM Systems Programming Series ISBN 0-201-14472-7