单词	Bessel's inequality
释义	Bessel's inequality For a vector v and an orthonormal set v1,…,vk, in an inner product space V, the inequality Equality holds for all v, if and only if v1,…,vk, is an orthonormal basis. Compare Parseval's identity.
随便看	equating real and imaginary parts equation equation of motion equations of motion with constant acceleration equator equiangular equiangular equiangular spiral equiareal equicontinuity equidistant equilateral equilibrium equinumerous equipollent equiprobable equivalence equivalence class equivalence relation equivalent equivalent norms equivariant map equi‐ Eratosthenes of Cyrene Erdős conjecture

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