Visualizations of the Square of Opposition
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.
Mathematics Subject Classification (2000).Primary 03B99 Secondary 03A05
Keywords.Square of opposition visualization diagrams Euler Venn Frege Peirce
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