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arXiv 0705.2477math.CAmath.GM
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多元正交展开式的Cesàro平均

Cesàro means of orthogonal expansions in several variables

Feng Dai, Yuan Xu

摘要:

$(C,δ)$方法研究了单位球上权函数$\prod_{i=1}^{d}|x_i|^{2\k_i}$的正交展开,以及单位球上相应的权函数和单形上Jacobi权的正交展开.一个尖锐的逐点估计建立的$(C,\d)$核与$\d > -1$和核的投影算子,这使我们能够推导出的Cesàro均值和投影算子在这些域上的范数的确切顺序。

英文摘要:

Cesàro $(C,δ)$ means are studied for orthogonal expansions with respect to the weight function $\prod_{i=1}^{d}|x_i|^{2\k_i}$ on the unit sphere, and for the corresponding weight functions on the unit ball and the Jacobi weight on the simplex. A sharp pointwise estimate is established for the $(C,\d)$ kernel with $\d > -1$ and for the kernel of the projection operator, which allows us to derive the exact order for the norm of the Cesàro means and the projection operator on these domains.

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。

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