Representation of Reproducing Kernels and the Lebesgue Constants on the Ball
نویسنده
چکیده
For the weight function (1− ||x||) on the unit ball, a closed formula of the reproducing kernel is modified to include the case −1/2 < m < 0. The new formula is used to study the orthogonal projection of the weighted L space onto the space of polynomials of degree at most n, and it is proved that the uniform norm of the projection operator has the growth rate of n (d−1)/2 for m < 0, which is the smallest possible growth rate among all projections, while the rate for m \ 0 is n.
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ورودعنوان ژورنال:
- Journal of Approximation Theory
دوره 112 شماره
صفحات -
تاریخ انتشار 2001