Spectral theory
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Spectrum (functional analysis)
Shift operator
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Spectral radius
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Jordan normal form
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Rayleigh quotient
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Eigenfunction
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Unitary operator
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Self-adjoint operator
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Langlands program
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Scattering
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Spectral theorem
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Partition of unity
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Dirac delta function
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Spectrum
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Operator (mathematics)
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Mathematical formulation of quantum mechanics
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C*-algebra
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Banach algebra
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