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#bessel's_inequality

Bessel's inequality

Theorem on orthonormal sequences

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. The inequality was derived by F.W. Bessel in 1828.

Sat 18th

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Bessel's inequality Cauchy–Schwarz inequality Hilbert space Generalized Fourier series Bessel Friedrich Wilhelm Bessel List of inequalities Bessel's correction Riesz–Fischer theorem List of things named after Friedrich Bessel
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