Diodorus Cronus

Diodorus Cronus was a prominent ancient Greek philosopher, typically associated with the Megarian school of philosophy. He lived around the 4th century BCE and is known primarily for his work in logic, particularly his contributions to the theories of modality and the nature of time. Diodorus is often remembered for his "master argument," which is a formal argument against the possibility of future contingents—that is, statements about future events that are not yet determined.