Duke Zhuang II of Qi Duke Zhuang II of Qi Duke Zhuang II of Qi (; died 548 BC) was from 553 to 548 BC ruler of the State of Qi, a major power during the Spring and Autumn period of ancient China. His personal name was Lü Guāng (呂光), ancestral name Jiang (姜), and Duke Zhuang was his posthumous title. He was the second of the two Qi rulers called Duke Zhuang. Before ascending the throne he was known as Prince Guang. Prince Guang was the son of Duke Ling of Qi and his concubine Sheng Ji. In 572 BC Duke Dao of the
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