Bessel's inequality

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Bessel's inequality. 1 connected concept: Hilbert space (related to).

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Community · Hilbert space

Summary

In mathematics, especially functional analysis, Bessel's inequality is a statement about the coefficients of an element in a Hilbert space with respect to an orthonormal sequence.

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Connections1

Constraint on coefficients in orthonormal expansions
This inequality provides a bound on the sum of the squares of the inner products of a vector with an orthonormal set in a Hilbert space.
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Facts