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75 Ideas of Indivisibility and Motion among the Chinese Mohists and Logicians Dahai Zou Abstract Among the Various Schools of the pre-qin period, the Mohists ( ) and Logicians ( ) were the most speculative, with their ideas of indivisibility and motion demonstrating a high level of sophistication. This paper discusses these ideas in-depth, holding that both the Mohists and Logicians possessed a concept of the indivisible, and believed that indivisible time was summable. While the Mohists held that indivisible space was summable, the Logicians did not. Moreover, while the Mohists believed that infinite successive divisions would produce an indivisible entity, the Logicians felt that such a procedure would continue without end. The Mohists realized the contradiction between the motion and rest of a moving object at the same moment, and chose to avoid this issue. Although the Logicians exposed this contradiction, they themselves came to a forced compromise. Because both the Mohists and Logicians indiscriminately applied the concept of motion in terms of an interval to motion, in terms of a moment they remained far from establishing the concept of instantaneous velocity. They are therefore only able to expose the above contradiction, but not solve it. Finally, this paper explores the relationship between the ideas of the Mohists and Logicians and the social environment of their times. Keywords: pre-qin philosophy, Mohists, Logicians, indivisibility, motion * Dahai Zou is an associate research professor at the Institute for History of Natural Sciences, Chinese Academy of Sciences.