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math.AP2020★ 2 cited
The stiff Neumann problem: asymptotic specialty and "kissing" domains
V. Chiadò Piat, L. D'Elia, S. A. Nazarov
We study the stiff spectral Neumann problem for the Laplace operator in a smooth bounded domain which is divided into two subdomains: an annulus and a…
math.AP2016
Effects of Rayleigh waves on the essential spectrum in perturbed doubly periodic elliptic problems
F. L. Bakharev, G. Cardone, S. A. Nazarov +1
We give an example of a scalar second order differential operator in the plane with double periodic coefficients and describe its modification, which causes an additional spectral…