The author (Knyazev) maintains a Web site, which can be accessed via the book's homepage, ETHOME, for interactive discussion on the subject, a bibliography page, and links to some software. In particular, the following software is available:

- MATLAB implementations of the block steepest ascent and the
block conjugate gradient methods, used for numerical experiments
in the previous subsection.
- A FORTRAN code that computes eigenvalues of the Laplacian in the L-shaped domain on a uniform mesh, using preconditioned domain decomposition Lanczos-type methods; see [270,266,271,272].

This software is experimental and does not reflect all insights and possibilities described in this section.

Susan Blackford 2000-11-20