Abstract
If λ is a positive vector measure on _l_2, the notion of λ-orthonormal system of functions leads to a natural generalization of the relation between orthogonality and best approximation in Hilbert spaces for spaces _L_2(λ) of square integrable functions with respect to λ. We provide a vector orthogonality criterion that induces the definition of a particular projection on a subspace of _L_2(λ) that we call the selfweighted approximation. As an application, we show a new extrapolation technique.
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