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An existential graph is a type of diagrammatic or visual notation for logical expressions, created 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.
The existential closure in K of a member M of K, when it exists, is, up to isomorphism, the least existentially closed superstructure of M. More precisely, it is any extensionally closed superstructure M ∗ of M such that for every existentially closed superstructure N of M , M ∗ is isomorphic to a substructure of N via an isomorphism that ...
A logical graph is a special type of graph-theoretic structure in any one of several systems of graphical syntax that Charles Sanders Peirce developed for logic.. In his papers on qualitative logic, entitative graphs, and existential graphs, Peirce developed several versions of a graphical formalism, or a graph-theoretic formal language, designed to be interpreted for logic.
In Aristotle's logic, categories are adjuncts to reasoning that are designed to resolve equivocations, ambiguities that make expressions or signs recalcitrant to being ruled by logic.
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XVI, no. 4, Oct. 1906), Peirce uses the words "seme", "pheme", and "delome" (pp. 506, 507, etc.) for the rheme-dicisign-argument typology, but retains the word "rheme" for the predicate in his system of Existential Graphs. Also note that Peirce once offered "seme" as an alternate expression for "index" in 1903.
Unfortunately, I do not know how to marry the output of graphics software to a Wikipedia entry. For that matter, I can create only alpha graphs on a computer, using boxes rather than ovals. If you would like to marry your graphics skills to my passion for the existential graphs, contact philip.meguire@canterbury.ac.nz
For instance, in the logic of graphs, testing whether a graph is disconnected belongs to monadic NP, as the test can be represented by a formula that describes the existence of a proper subset of vertices with no edges connecting them to the rest of the graph; however, the complementary problem, testing whether a graph is connected, does not ...