Peirce's Search for a Graphical Modal Logic (Propositional Part)

History and Philosophy of Logic 32 (2):153 - 176 (2011)


This paper deals with modality in Peirce's existential graphs, as expressed in his gamma and tinctured systems. We aim at showing that there were two philosophically motivated decisions of Peirce's that, in the end, hindered him from producing a modern, conclusive system of modal logic. Finally, we propose emendations and modifications to Peirce's modal graphical tinctured systems and to their underlying ideas that will produce modern modal systems

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Esther Ramharter
University of Vienna
Christian Gottschall
University of Vienna

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