Reasoning with Diagrams Only

George Furnas

Traditional deductive systems work with sentences of symbols. Even in newer systems that also reason from diagrams sentential representations still play a major role. The work here explores deductive systems that use only picture-like representations. Machinery functionally equivalent to variables, quantifiers, substitution, unification, and binding are defined based on a model of deductive chaining as the composition of mappings, where pictures themselves are used to specify the mappings.

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