Vector-valued L_p convergence of orthogonal series and Lagrange interpolation

Details Vector-valued L_p convergence of orthogonal series and Lagrange interpolation Vector-valued L_p convergence of orthogonal series and Lagrange interpolation

1992-08-13

arxiv.org/abs/math/9208201v1

Forum Math. 6 (1994), 183-207

Mathematics

Functional Analysis

Scientific paper

We give necessary and sufficient conditions for interpolation inequalities of the type considered by Marcinkiewicz and Zygmund to be true in the case of Banach space-valued polynomials and Jacobi weights and nodes. We also study the vector-valued expansion problem of $L_p$-functions in terms of Jacobi polynomials and consider the question of unconditional convergence. The notion of type $p$ with respect to orthonormal systems leads to some characterizations of Hilbert spaces. It is also shown that various vector-valued Jacobi means are equivalent.

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