## Eigenvalue approximation.(English)Zbl 0583.65035

Computational mathematics, Banach Cent. Publ. 13, 559-573 (1984).
[For the entire collection see Zbl 0556.00012.]
The selfadjoint eigenvalue problem $find\quad \mu \in {\mathbb{R}}\quad and\quad 0\neq u\in V\quad such\quad that\quad b(u,v)=\mu \cdot (u,v)\quad \forall v\in V$ is solved in a Hilbert space V. This problem is approximated by a family of eigenvalue problems on finite-dimensional spaces. Sufficient conditions for convergent approximations are given. The eigenvalues are found using Rayleigh quotients. The convergence of the method is proved and error estimates as well as some examples are given.
Reviewer: L.Boubelíková

### MSC:

 65J10 Numerical solutions to equations with linear operators 65L15 Numerical solution of eigenvalue problems involving ordinary differential equations 47A10 Spectrum, resolvent 34L99 Ordinary differential operators

Zbl 0556.00012