normal operator
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inner product space
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spectrum
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Banach algebra
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self-adjoint operator
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Hilbert–Schmidt operator
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mathematics
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International Standard Book Number
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complex number
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Wayback Machine
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digital object identifier
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quantum field theory
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continuous function
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Hilbert space
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functional analysis
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Riemann hypothesis
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linear map
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calculus of variations
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Cauchy–Schwarz inequality
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Banach space
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trace
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