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Upper Bounds for the Distance to Finite-Dimensional Subspaces in Inner Product Spaces

Sever Silvestru Dragomir

math.MGarXiv:math/0412469

Abstract

We establish upper bounds for the distance to finite-dimensional subspaces in inner product spaces and improve some generalisations of Bessel's inequality obtained by Boas, Bellman and Bombieri. Refinements of the Hadamard inequality for Gram determinants are also given.

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