Remarks to Galerkin and least squares methods with finite elements for general elliptic problems. (English) Zbl 0353.65067


65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs
45B05 Fredholm integral equations
45E10 Integral equations of the convolution type (Abel, Picard, Toeplitz and Wiener-Hopf type)
58J40 Pseudodifferential and Fourier integral operators on manifolds
35S15 Boundary value problems for PDEs with pseudodifferential operators