Diodorus Cronus (; died c. 284 BC) was a Greek philosopher and dialectician connected to the Megarian school. He was most notable for logic innovations, including his master argument formulated in response to Aristotle's discussion of future contingents. Life Diodorus was the son of Ameinias of Iasus in Caria. He lived in the court of Alexandria in the reign of Ptolemy I Soter, who is said to have given him the surname of Cronus ("old fogey") on account of his inability to solve at once some dialectic problem proposed by Stilpo, when the two philosophers were dining with the king. Diodorus is said to have taken that disgrace so much to heart that after his return from the meal, and writing a treatise on the problem, he died in despair. However, according to Strabo, Diodorus himself adopted the surname of Cronus from his teacher, Apollonius Cronus. Diodorus is thought to have died around 284 BC; his date of birth is unknown. It was once thought that he was old enough to have influenced Aristotle (384–322 BC), but there is no strong evidence for this. Diodorus was particularly celebrated for his great dialectic skill, for which he was called The Dialectician. This effectively became his surname, and descended even to his five daughters, Menexene, Argia, Theognis, Artemesia, and Pantaclea, who were likewise distinguished as dialecticians. His pupils included Philo the Dialectician, and Zeno of Citium—the founder of the Stoic school. Although influenced by the Megarian school it is not clear how closely Diodorus and his fellow dialecticians were connected to that particular philosophical school. Philosophy He was most notable for logic innovations, including his master argument formulated in response to Aristotle's discussion of future contingents. Diogenes Laërtius says that Diodorus also made use of the Sorites paradox, and is said to have invented two others of the same kind, viz. The Masked Man and The Horns, which are, however, also ascribed to Eubulides. Aulus Gellius claims that he also rejected the view that words are ambiguous, any uncertainty in understanding was always due to speakers expressing themselves obscurely. According to Sextus Empiricus, he also maintained that space was indivisible, and consequently that motion was impossible. He further denied the coming into existence and all multiplicity both in time and in space; but he considered the things that fill up space as one whole composed of an infinite number of indivisible particles.