# Logical graph

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.

## See alsoEdit

## External linksEdit

Media related to Logical graphs at Wikimedia Commons

- Logical Graph @ Commens Dictionary of Peirce's Terms
- Existential Graphs, Jay Zeman, ed., U. of Florida. With 4 works by Peirce.
- Frithjof Dau's page of readings and links on existential graphs includes lists of: books exclusively on existential graphs; books containing existential graphs; articles; and some links and downloadables.
- The literature of C.S. Peirce’s Existential Graphs (via Internet Archive), Xin-Wen Liu, Institute of Philosophy, Chinese Academy of Social Sciences, Beijing, PRC. A whole lot there.