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Part of a series on |
Charles Sanders Peirce |
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Pragmatism in epistemology |
Logic |
Semiotic theory |
Miscellaneous contributions |
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An existential graph is a type of diagrammatic or visual notation for logical expressions, proposed by Charles Sanders Peirce, who wrote on graphical logic as early as 1882,[1] and continued to develop the method until his death in 1914. They include both a separate graphical notation for logical statements and a logical calculus, i.e. (essentially) a formal system of rules of inference that can be used to derive new theorems from existing ones.
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