Liu Xiang, Prince of Qi Liu Xiang, Prince of Qi Liu Xiang (; died 179 BC), formally King Ai of Qi () was a key player during the Lü Clan Disturbance (180 BC). He was the grandson of Emperor Gaozu of Han and the eldest son of Liu Fei, Prince of Qi by Consort Si. With Liu Fei's death in 189 BC, Emperor Hui allowed Liu Xiang to inherit the title of "Prince of Qi". During the Lü Clan Disturbance, Liu Xiang led the Qi forces and also seized the forces of the nearby Principality of Langye, and was ready to march to the capital
What Is Mathematics? Expectations" by Charles Dickens. According to Constance Reid, Courant finalized the title after a conversation with Thomas Mann. What Is Mathematics? What Is Mathematics? is a mathematics book written by Richard Courant and Herbert Robbins, published in England by Oxford University Press. It is an introduction to mathematics, intended both for the mathematics student and for the general public. First published in 1941, it discusses number theory, geometry, topology and calculus. A second edition was published in 1996 with an additional chapter on recent progress in mathematics, written by Ian Stewart. The book was based on Courant's course material. Although