  Original philosophical contributions are testified only for Diodorus Cronus and Philo, in the areas of logic, language and theory of motion (for Diodorus' contributions in the latter two areas see entry Diodorus Cronus); their views on logic were influential on Stoic logic, which in turn anticipated many of the developments in 20th century logic. Philosophers of the Dialectic sect had an impact also on Epicurean, Peripatetic, and Sceptic philosophy, and seem to have interacted in discussion with members of most Hellenistic philosophical schools. Diodorus Cronus’ modal theory and his Master Argument served as a major philosophical inspiration for Arthur Prior.