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Logical graph

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A logical graph is a special type of diagramatic 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 the century since Peirce initiated this line of development, a variety of formal systems have branched out from what is abstractly the same formal base of graph-theoretic structures.

See also

Logical Graph : Introduction
Logical Graph : Formal Development
Logical Graph
Peirce's Law
Logical Graph
Spencer-Brown's talks at Esalen 1973 — Self-referential forms are introduced in the section entitled "Degree of Equations and the Theory of Types"
Box Algebra, Boundary Mathematics, Logic, and Laws of Form
Conceptual Graphs — Brief Summary
Conceptual Graphs — Resource Hub
Conceptual Structures, Home Page for annual conference.