Xu Shichang (Pinyin) or Hsu shih chang (Wade-Giles) (1855-1939) was a prominent figure of the Beiyang[?] warlords and President of the Republic of China from 1918 - 1922.
... complex conjugates of each other. (In this case, the parabola does not intersect the x-axis at all.) Note that when computing roots numerically, the usual form of the ...