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Kahn’s research was devoted to the history of philosophy, mostly Greek. He published extensively on Presocratic philosophy, with emphasis on the origins of Greek cosmology and the interaction between science and religion in early Greek thought. He developed a new reading of Plato’s dialogues as the diversified literary expression for a unified world view. He composed a history of the Pythagorean movement from archaic Greek to Copernicus and Kepler. He also published in historical linguistics, including a study of the verb for “to be” in Ancient Greek.