Asymptotics and bounds for the zeros of Laguerre polynomials: a survey
Asymptotics and bounds for the zeros of Laguerre polynomials: a survey
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拉盖尔多项式零点的渐近和界限:一项调查
DOI:
10.1016/s0377-0427(01)00549-0
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发表时间:
2002
影响因子:
2.4
通讯作者:
L. Gatteschi
中科院分区:
文献类型:
--
作者:
L. Gatteschi
Some of the work on the construction of inequalities and asymptotic approximations for the zeros λn,k(α), k=1,2,…,n, of the Laguerre polynomial Ln(α)(x) as ν=4n+2α+2→∞, is reviewed and discussed. The cases when one or both parameters n and α unrestrictedly diverge are considered. Two new uniform asymptotic representations are presented: the first involves the positive zeros of the Bessel function Jα(x), and the second is in terms of the zeros of the Airy function Ai(x). They hold for k=1,2,…,[qn] and for k=[pn],[pn]+1,…,n, respectively, where p and q are fixed numbers in the interval (0,1). Numerical results and comparisons are provided which favorably justify the consideration of the new approximations formulas.