Did you mean: Bernhardt, Peter
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    Peter Bernhard (2008). Visualizations of the Square of Opposition. Logica Universalis 2 (1):31-41.
    . In logic, diagrams have been used for a very long time. Nevertheless philosophers and logicians are not quite clear about the logical status of diagrammatical representations. Fact is that there is a close relationship between particular visual (resp. graphical) properties of diagrams and logical properties. This is why the representation of the four categorical propositions by different diagram systems allows a deeper insight into the relations of the logical square. In this paper I want to give some examples.
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