Alpha graph

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.

References

• Peirce, C.S., Bibliography.

See also

Ampheck Boolean algebra (logic) Boolean function Boolean logic Boolean-valued function Conceptual graph

Laws of Form Logical matrix Minimal negation operator Peirce's law Propositional calculus Propositional formula Truth table

External links

• Logical Graph @ PlanetMath
• Logical Graph @ Commens Dictionary of Peirce's Terms
• Laws of Form web site
• Spencer-Brown's talks at Esalen 1973 — Self-referential forms are introduced in the section entitled "Degree of Equations and the Theory of Types"
• Louis H. Kauffman — Box Algebra, Boundary Mathematics, Logic, and Laws of Form

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