The convergence of the so-called quadratic method for computing eigenvalue enclosures of general self-adjoint operators is examined. Explicit asymptotic bounds for convergence to isolated eigenvalues are found. These bounds turn out to improve signi?cantly upon those determined in previous investigations. The theory is illustrated by means of several numerical experiments performed on particularly simple benchmark models of one-dimensional Schrodinger operators.
|Journal||IMA Journal of Numerical Analysis|
|Early online date||14 Jul 2015|
|Publication status||Published - Oct 2015|
- 34L15, 35P15