arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2102.04126math.NAcs.NA
收藏

关于区间上的$(β,γ)$ -Chebyshev函数和点

On $(β,γ)$-Chebyshev functions and points of the interval

Stefano De Marchi, Giacomo Elefante, Francesco Marchetti

摘要:

本文引入了$(β,γ)$ -Chebyshev函数类及相应的点,它可以看作是{ \it广义}切比雪夫多项式和点的族。对于$(β,γ)$函数,我们证明了它们在$[-1,1]$的某些子区间上关于加权反余弦测度是正交的.特别是我们调查的情况下,他们成为多项式,推导出新的结果,关于经典的切比雪夫多项式的第一类。此外,还证明了Chebyshev点和Chebyshev-Lobatto点的子集是$(β,γ)$ -Chebyshev点的实例.我们还研究了多项式插值的勒贝格常数在这些点上的不同的参数$β$和$γ$的行为。

英文摘要:

In this paper, we introduce the class of $(β,γ)$-Chebyshev functions and corresponding points, which can be seen as a family of {\it generalized} Chebyshev polynomials and points. For the $(β,γ)$-Chebyshev functions, we prove that they are orthogonal in certain subintervals of $[-1,1]$ with respect to a weighted arc-cosine measure. In particular we investigate the cases where they become polynomials, deriving new results concerning classical Chebyshev polynomials of first kind. Besides, we show that subsets of Chebyshev and Chebyshev-Lobatto points are instances of $(β,γ)$-Chebyshev points. We also study the behavior of the Lebesgue constants of the polynomial interpolant at these points on varying the parameters $β$ and $γ$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑