Asymptotically sharp uniform estimates in a scalar spectral stiff problem
Miguel Lobo, С. А. Назаров, Eugenia Pérez · Comptes Rendus Mécanique · 2003
Estimates of convergence rates for rescaled eigenvalues of the stiff Neumann problem for the Laplacian are obtained. The bounds are expressed in terms of the stiffness ratio and properties of the limit spectrum both for low and middle frequency ranges.