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Spectral theory
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==See also== {{Portal|Mathematics}} * [[functional calculus|Functions of operators]], [[Operator theory]] * [[Lax pair]]s * [[Least-squares spectral analysis]] * [[Riesz projector]] * [[Self-adjoint operator]] * [[Spectrum (functional analysis)]], [[Resolvent formalism]], [[Decomposition of spectrum (functional analysis)]] * [[Spectral radius]], [[Spectrum of an operator]], [[Spectral theorem]] * [[Spectral theory of compact operators]] * [[Spectral theory of normal C*-algebras]] * [[Sturm–Liouville theory]], [[Integral equation]]s, [[Fredholm theory]] * [[Compact operator]]s, [[Isospectral]] operators, [[complete metric space|Completeness]] * [[Spectral geometry]] * [[Spectral graph theory]] * [[List of functional analysis topics]]
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