A logical graph is a special type of diagrammatic 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.
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