King Xuan of Qi King Xuan of Qi King Xuan of Qi (; died 301 BC) was from 319 to 301 BC ruler of Qi, one of the seven major states of the Warring States period of ancient China. King Xuan's personal name was Tian Bijiang (田辟疆), ancestral name Gui (媯), and King Xuan was his posthumous title. King Xuan succeeded his father King Wei of Qi, who died in 320 BC after 37 years of reign. He reigned for 19 years and died in 301 BC. He was succeeded by his son, King Min of Qi. In traditional Chinese historiography, king Xuan is
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