Diagrammatic method for modal syllogistic
DOI:
https://doi.org/10.4013/fsu.2025.263.04Keywords:
Syllogism, modal logic; de dicto, diagrammatic method, Theophrastus, in peiorem.Abstract
I develop a diagrammatic method for Modal Syllogistic restricted to de dicto modalities in their contemporary interpretation. This method is a conservative extension of a previous diagrammatic method for Assertoric Syllogistic. It uses two types of inference rules: the intralevel inference rules contain the inference rules of the diagrammatic method for Assertoric Syllogistic, while the interlevel inference rules implement Theophrastus’ in peiorem rule.
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Copyright (c) 2025 Frank Thomas Sautter
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