x_{i+1}={\frac {1}{3}}\left({\frac {a}{x_{i}^{2}}}+2x_{i}\right)} 哈雷法(英语:Halley'smethod): x i + 1 = x i ( x i 3 + 2 a 2 x i 3 + a ) {\displaystyle x_{i+1}=x_{i}\left({\frac
them after his advisor, Wolfgang Gröbner(英语:Wolfgang Gröbner). Halley's comet(英语:Halley's comet) was observed by astronomers since at least 240 BC, but
Society. 22 January 2005, 59 (1): 30. doi:10.1098/rsnr.2004.0067. Halley, Edmund. A New Method of Determining the Parallax of the Sun. Philosophical Transactions