Biography
Li Chi Hsu or Lizhi Xu, Chinese mathematician (Zhangjiagang, Jiangsu Province 23 September 1920 –
Born Quanyong Xu
ACHIEVEMENTS
Extended Laplace asymptotic method to multiple integrals involving a large parameter (1948-51)
Obtained a class of complete asymptotic expansions for the differences of zero
Found a general asymptotic expansion formula for a wide class of oscillatory integrals (1958)
First to offer a quantitative estimation for the first exponential formula of Hille
With R.H. Wang formulated the method of multiplier enlargement in a very general form
Obtained the square root iteration method with global convergence (reported in 1964; published in 1973)
With Y.S. Zhou, R.H. Wang, T.X. He & J.X. Yang developed a general process for the construction of lowering dimensional expansions
Established some general pairs of Moebius inversion formulae that are useful for finding solutions of VolterrA type integral equations
Eponym of Gould-Hsu inversion pair
