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On block-quasi-tridiagonal matrices
We intend to invert (and to study the eigenvalues of) block-quasi--tridíagonal matrices, We also mention ways for handling the problem of eigenvalues of a block-quasi-tridiagonal matrix and we obtain upper bounds for the spectral radius of á (certain) block--quasi-tridiagonal matrix which arises in the discretization of partial differential equations of elliptic type, self-adjoint case .doi:10.5565/publmat_20180_48 fatcat:nn4uti6xw5bfhaxctjl2byxc7e