摘要: 本文讨论不变调和函数的梯度范数估计的最优系数C(x,l)。根据不变Poisson核

及Möbius变换,计算出常数 C(x,l)的具体表达式。
Abstract:
In this paper, we discuss the optimal coefficient C(x,l) for the estimation of the gradient norm of the invariant harmonic function. According to the invariant Poisson kernel

and Möbius transforms, the specific expression of the constant C(x,l) is calculated.