Commutative Sequences of Integrable Functions and Best Approximation With Respect to the Weighted Vector Measure Distance |
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Authors: | L. M. García. Raffi E. A. Sánchez. Pérez J. V. Sánchez. Pérez |
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Affiliation: | (1) Departamento de Matemática Aplicada, E.T.S. Ingenieros de Caminos, Canales y Puertos, Camino de Vera, E-46071 Valencia, Spain |
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Abstract: | Let λ be a countably additive vector measure with values in a separable real Hilbert space H. We define and study a pseudo metric on a Banach lattice of integrable functions related to λ that we call a λ-weighted distance. We compute the best approximation with respect to this distance to elements of the function space by the use of sequences with special geometric properties. The requirements on the sequence of functions are given in terms of a commutation relation between these functions that involves integration with respect to λ. We also compare the approximation that is obtained in this way with the corresponding projection on a particular Hilbert space. |
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Keywords: | 46G10 46E30 46C05 |
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