November 8th to 11th, 2004

Érica Gonçalves
ericalg@terra.com.br
PUC - SP - Brazil

HISTORICAL ASPECTS OF CHARLES S. PEIRCE'S LOGICAL DIAGRAMS

ABSTRACT
John Venn was the first citizen on working with the diagrammatic speech (Symbolic Logic, 2nd ed., London, 1894). The works of John Venn has deserved good considerations of I. M. Bochenski (A History of Formal Logic, translated by Ivo Thomas, University of Notre Dame Press, 1961, pp. 260-2) and H. Scholz (Esquisse d´une histoire de la logique, aubier - Montaigne, 1968, pp. 130-132) et alii.
C. S. pierce has started his logical studies in 1856 and along his way the work influence of John Venn was enough having another influence on his diagrammatic thought the chemist William K. Clifford and James J. Sylvester, people who used chemical diagrams for algebraic representation, besides, C. S. Peirce has worked with diagrams in logic.
C. S. Peirce has had as an aim amplifying the field of using diagrammatic speech. From its note had begun the existential graphs on levels alpha, beta and gamma, corresponding respectively to the classical calculus, to the classical predicate calculus of the first order, and to a type of modal logic.
Our consideration have restricted to a historic brief of logical diagrams. For that purpose we will use texts of C. S. Peirce and his followers.

KEYWORDS: Logical- Diagrams, C. S. Peirce.

Center for Pragmatism Studies
Philosophy Graduate Program
Departament of Philosophy
Pontifical Catholic University of São Paulo - Brazil