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Bessel inequality
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Mathematics
Area of mathematics
Analysis
Functional analysis
Hilbert space
Orthonormal sequence
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Words: 12
For an orthonormal sequence
(
e
n
)
in a Hilbert space,
∑
n
∣
⟨
x
,
e
n
⟩
∣
2
≤
∥
x
∥
2
.
(25)
Ancestors
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Orthonormal sequence
Hilbert space
Functional analysis
Analysis
Area of mathematics
Mathematics
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Weakly null orthonormal sequence