Diagrammatic reasoning

For Peirce, the manipulation upon diagrams is called “diagrammatic reasoning” (NEM 4:47-48):

peirce

By diagrammatic reasoning, I mean reasoning which constructs a diagram according to a precept expressed in general terms, performs experiments upon this diagram, notes their results, assures itself that similar experiments performed upon any diagram constructed according to the same precept would have the same results, and expresses this in general terms. This was a discovery of no little importance, showing, as it does, that all knowledge without exception comes from observation.

Joao Queiroz

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