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arXiv 1602.00044math.CA
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拟正交超球面多项式的极值零点的界

Bounds for Extreme Zeros of Quasi-orthogonal Ultraspherical Polynomials

Kathy Driver, Martin E. Muldoon

摘要:

我们讨论和比较的上,下界由两种不同的方法获得的超球面多项式$C_{n}^{(λ)}$大于$1$时,$-3/2 < λ< -1/2.$我们的第一种方法使用混合三项递归关系和零交错,而第二种方法使用的方法回到欧拉和瑞利和已经应用到贝塞尔函数和拉盖尔和$q$ -拉盖尔多项式的正零。我们使用由第二种方法得到的界限来简化$-3/2 < λ< \infty$的$(1-x^2)C_{n}^{(λ)}$和$C_{n+1}^{(λ)}$的零交错的证明。

英文摘要:

We discuss and compare upper and lower bounds obtained by two different methods for the positive zero of the ultraspherical polynomial $C_{n}^{(λ)}$ that is greater than $1$ when $-3/2 < λ< -1/2.$ Our first approach uses mixed three term recurrence relations and interlacing of zeros while the second approach uses a method going back to Euler and Rayleigh and already applied to Bessel functions and Laguerre and $q$-Laguerre polynomials. We use the bounds obtained by the second method to simplify the proof of the interlacing of the zeros of $(1-x^2)C_{n}^{(λ)}$ and $C_{n+1}^{(λ)}$, for $-3/2 < λ< \infty$.

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