Best Approximation and Cyclic Variation Diminishing Kernels
نویسندگان
چکیده
where the kernel K(x, y) is strictly cyclic variation diminishing, and related problems including periodic generalized perfect splines. For various approximation problems of this type, we show the uniqueness of the best approximation and characterize the best approximation by extremal properties of the error function. The results are proved by using a characterization of best approximants from quasiChebyshev spaces and certain perturbation results. 1997 Academic Press
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تاریخ انتشار 1995