In intervals, analysis can find function-root sets {spectral theory}. Root index is less than its multiplicity. General spectral theory can be for symmetric kernels. Function kernels can have orthonormal eigenfunctions {Hilbert-Schmidt theorem}. Eigenfunction roots {eigenvalue, spectral theory} can be point, band, or continuous spectrum.
Spectral theory can generalize Volterra's method {spectral radius theorem}.
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Date Modified: 2022.0225