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Wang, Shixi; Bi, Hai; Yang, Yidu
Computers & mathematics with applications (1987), 11/2023, Volume: 150Journal Article
The transmission eigenvalue problem arising from the inverse scattering theory is of great importance in the theory of qualitative methods and in the practical applications. In this paper, we study the FEM for the transmission eigenvalue problem for anisotropic inhomogeneous media in Ω⊂Rd(d=2,3). Using the T-coercivity and the spectral approximation theory, we derive an a posteriori estimator of residual type and prove its effectiveness and reliability for eigenfunctions. In addition, we also prove the reliability of the estimator for transmission eigenvalues. The numerical experiments indicate our method is efficient and can reach the optimal order DoF−2m/d by using piecewise polynomials of degree m for real and complex eigenvalues.
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