Approximation property
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Bounded operator
Hellinger–Toeplitz theorem
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Invariant subspace
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Compact operator
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Hilbert transform
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Measurement in quantum mechanics
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Projection (linear algebra)
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Locally convex topological vector space
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Spectral theory
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Sturm–Liouville theory
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Continuous linear extension
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Reflexive operator algebra
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Nest algebra
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Weak operator topology
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Strong operator topology
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Predual
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Von Neumann bicommutant theorem
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Operator algebra
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Positive operator
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Group algebra of a locally compact group
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Schur decomposition
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Gelfand–Naimark theorem
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Bounded function
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Gelfand–Naimark–Segal construction
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Von Neumann algebra
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Uniform boundedness principle
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Operator norm
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Unitary operator
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Spectrum (functional analysis)
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Inverse problem
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Self-adjoint operator
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Quantum decoherence
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List of unsolved problems in mathematics
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Toeplitz matrix
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Singular value decomposition
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Cholesky decomposition
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Fourier transform
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Lp space
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Topological group
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Definite matrix
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Metric space
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Linear map
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John von Neumann
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Hahn–Banach theorem
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Functional analysis
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Banach space
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Bounded linear map
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Bounded linear operator
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Continuous operator
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Bounded linear function
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