On determination of eigenvalues and eigenvectors of selfadjoint operators
Josef Kolomý · Applications of Mathematics · 1981
Two simple methods for approximate determination of eigenvalues and eigenvectors of linear self-adjoint operators are considered in the following two cases: (i) lower-upper bound $\lambda _1$ of the spectrum $\sigma (A)$ of $A$ is an isolated point of $\sigma (A)$; (ii) $\lambda _1$ (not necessarily an isolated point of $\sigma (A)$ with finite multiplicity) is an eigenvalue of $A$.