Peirce's Graphs Amended

Hartley Slater

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


One of the claims made for C. S. Peirce's existential graphs has been that they are a deductively complete formulation of first-order logic with identity. As Peirce presented them, this is true only for certain versions of first-order logic: those which do not include terms for individuals. I amend Peirce's rules here, showing, in particular, how they are capable of demonstrating that, for instance, 'Jack is in the kitchen' contradicts 'Jack is not in the kitchen'.
Original languageEnglish
Pages (from-to)101-106
JournalHistory and Philosophy of Logic
Publication statusPublished - 1998


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