Perturbazioni singolari per un problema quasi-ellittico a coefficienti costanti nel semispazio
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A singular perturbation analysis is performed for a case in which both the reduced and the perturbed problems are semi-elliptic boundary problems with constant coefficients in a half space. Our treatment is based on the results presented in the first part of this paper, in which a theorem by Ostrowski is employed to analyse the asymptotic behavior of the roots of the symbol of P(D)+ɛQ(D) for ɛ→0+.
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