Greek atomist. Little is known of the life of Leucippus, who is yet treated by Aristotle as the founder of Greek atomism. Two works are attributed to him: On Mind and Great World-System, but nearly nothing is known of what they contained. It is impossible to distinguish his doctrines from those of Democritus, whose more extensive writings form the basis of what is known of the system he shared with Leucippus. For an outline, see atomism, Democritus of Abdera.