Zeros of orthogonal polynomials on the real line

Zeros of orthogonal polynomials on the real line
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DOI:
10.1016/s0021-9045(03)00038-8
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发表时间:
2003-04-01
影响因子:
0.9
通讯作者:
Simon, B
Simon, B
中科院分区:
数学3区
文献类型:
--
作者:
Denisov, SA;Simon, B

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设p(n)(x)是R中紧支集测度dmu的正交多项式。如果E不是supp(dmu)的元素,我们证明了有一个delta > 0,使得对于所有n,p(n)或p(n+1)在(E - delta,E + delta)中没有零。如果E是supp(mu)的一个孤立点,我们证明了存在一个delta,使得对所有n,p(n)或p(n+1)在(E - delta,E + delta)中至多有一个零.我们提供了一个例子,其中p(n)的零点在supp(dmu)的间隙中是稠密的。(C)2003 Elsevier Science(美国)。All rights reserved.
Let p(n)(x) be the orthonormal polynomials associated to a measure dmu of compact support in R. If E is not an element of supp(dmu), we show there is a delta > 0 so that for all n, either p(n) or p(n+1) has no zeros in (E - delta, E + delta). If E is an isolated point of supp(mu), we show there is a delta so that for all n, either p(n) or p(n+1) has at most one zero in (E - delta, E + delta). We provide an example where the zeros of p(n) are dense in a gap of supp(dmu). (C) 2003 Elsevier Science (USA). All rights reserved.