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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1111.1218math.CA
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几类经典正交多项式的极值零点的界

Bounds for extreme zeros of some classical orthogonal polynomials

K. Driver, K. Jordaan

摘要:

我们导出了Laguerre多项式、Jacobi多项式和Gegenbauer多项式的最小零点的上界和最大零点的下界。我们的方法使用混合的三项递归关系满足多项式对应的不同参数(S)在同一个经典的家庭。我们证明了交错性质的零施加限制的公共零点的多项式的可能位置,并推导出严格的界限属于这三个经典家庭的多项式的极端零点。我们数值计算表明,我们的方法产生的界限,提高已知的下(上)界的最大(最小)零点的多项式在这些家庭,特别是在雅可比和Gegenbauer多项式的情况下。

英文摘要:

We derive upper bounds for the smallest zero and lower bounds for the largest zero of Laguerre, Jacobi and Gegenbauer polynomials. Our approach uses mixed three term recurrence relations satisfied by polynomials corresponding to different parameter(s) within the same classical family. We prove that interlacing properties of the zeros impose restrictions on the possible location of common zeros of the polynomials involved and deduce strict bounds for the extreme zeros of polynomials belonging to each of these three classical families. We show numerically that the bounds generated by our method improve known lower (upper) bounds for the largest (smallest) zeros of polynomials in these families, notably in the case of Jacobi and Gegenbauer polynomials.

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