Geodesic
Investigation of integrodifferential equations by methods of spectral theory
Contemporary Mathematics. Fundamental Directions, Dedicated to the memory of Professor N. D. Kopachevsky, Tome 67 (2021) no. 2, pp. 255-284

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This paper provides a survey of results devoted to the study of integrodifferential equations with unbounded operator coefficients in a Hilbert space. These equations are operator models of integrodifferential partial differential equations arising in numerous applications: in the theory of viscoelasticity, in the theory of heat propagation in media with memory (Gurtin–Pipkin equations), and averaging theory. The most interesting and profound results of the survey are devoted to the spectral analysis of operator functions that are symbols of the integrodifferential equations under study. 
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     author = {V. V. Vlasov and N. A. Rautian},
     title = {Investigation of integrodifferential equations by methods of spectral theory},
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V. V. Vlasov; N. A. Rautian. Investigation of integrodifferential equations by methods of spectral theory. Contemporary Mathematics. Fundamental Directions, Dedicated to the memory of Professor N. D. Kopachevsky, Tome 67 (2021) no. 2, pp. 255-284. http://geodesic.mathdoc.fr/item/CMFD_2021_67_2_a3/