The Master Argument of Diodorus Cronus as an alternative account of modality

Abstract

This paper considers an argument due to Diodorus Cronus (3rd century BCE), called by the ancients the Master Argument, which provides a theory of modality different from the modern orthodoxy of modal logic. It is argued that the Master Argument is supported by plausible intuitions, and that the modal logic obtained has reasonable epistemological motivation.