在 $0le x \le 1$ 的区间内对 $x^m (-\log x)^l$ 进行切比雪夫近似计算

Richard J. Mathar
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引用次数: 0

摘要

用移位切比雪夫多项式 $T_n^*(x)$ 对 $x^m (-\log x)^l$ 进行级数展开需要对积分族 $\int_0^1 x^m(-\log x)^l dx / \sqrt{x-x^2}$进行求值。我们证明可以通过部分积分将其简化为指数为 $m=0$ 的积分之和,这些积分具有已知的多伽马函数有限和的表示形式。
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Chebyshev approximation of $x^m (-\log x)^l$ in the interval $0\le x \le 1$
The series expansion of $x^m (-\log x)^l$ in terms of the shifted Chebyshev Polynomials $T_n^*(x)$ requires evaluation of the integral family $\int_0^1 x^m (-\log x)^l dx / \sqrt{x-x^2}$. We demonstrate that these can be reduced by partial integration to sums over integrals with exponent $m=0$ which have known representations as finite sums over polygamma functions.
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