Abstract
Continuing some investigations started in previous papers, we introduce and study a sequence of multidimensional positive integral operators which generalize the Gauss-Weierstrass operators. We show that this sequence is an approximation process in some classes of weighted L p spaces on ℝN, N ≥ 1. Estimates of the rate of convergence are also obtained.
Our mean tool is a Korovkin-type theorem which we establish in the context of L p(X, µ) spaces, X being a locally compact Hausdorff space and µ a regular positive Borel measure on X. Several examples are explicitly indicated as well.
Резюме
В продолжение более ранних исследований, в Этой работе мы строим и изучаем последовательность многомерных положительных интегральных операторов, которые обобшают операторы Гаусса-Вейерштрасса. Мы доказываем, что Эта последовательность является аппроксимационным процессом в некоторых весовых пространствах L p на ℝN, N ≥ 1. Установлены также и оценки скорости сходимости.
Основой является одна теорема типа Коровкина, которую мы доказываем в контексте пространств L p(X, µ), где X — локально компактное пространство Хаусдорфа, а µ — регулярная положительная борелевская мера на X. Приведены некоторые конкретные примеры.
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References
F. Altomare and M. Campiti, Korovkin-type Approximation Theory and its Application, de Gruyter Studies in Mathematics, 17, de Gruyter (Berlin-New York, 1994).
F. Altomare and M. Cappelletti Montano, Regular vector lattices of continuous functions and Korovkin-type theorems. Part I, Studia Math., 171(2005), 239–260.
F. Altomare and M. Cappelletti Montano, Regular vector lattices of continuous functions and Korovkin-type theorems. Part II, Studia Math., 172(2006), 69–90.
F. Altomare and S. Milella, Integral-type operators on continuous function spaces on the real line, J. Approx. Theory, 152(2008), 107–124.
F. Altomare and S. Milella, On the C 0-semigroups generated by second order differential operators on the real line, Taiwan. J. Math., (2009), to appear.
H. Bauer, Measure and Integration Theory, de Gruyter Studies in Mathematics, 26, de Gruyter (Berlin-New York, 2001).
G. B. Folland, Real Analysis. Modern techniques and their applications, John Wiley and Sons (New York, 1999).
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This work has been partially supported by the Research Project “Real Analysis and Functional Analytic Methods for Differential Problems and Approximation Problems”, University of Bari, 2007.
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Altomare, F., Milella, S. On a sequence of integral operators on weighted L p spaces. Anal Math 34, 237–259 (2008). https://doi.org/10.1007/s10476-008-0401-5
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DOI: https://doi.org/10.1007/s10476-008-0401-5