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Existential graph
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<p>An existential graph is a type of <a href="/facts/Diagram/H0PKEUrI">diagrammatic</a> or visual notation for logical expressions, created by <a href="/facts/Charles_Sanders_Peirce/z76dNqhM">Charles Sanders Peirce</a>, who wrote on graphical logic as early as 1882, 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, a formal system of rules of inference that can be used to derive theorems. </p>