Elementary linear algebra for advanced spectral problems
Spectral Theory
2025-10-20 v1 Numerical Analysis
Numerical Analysis
Abstract
We discuss the general method of Grushin problems, closely related to Shur complements, Feshbach projections and effective Hamiltonians, and describe various appearances in spectral theory, pdes, mathematical physics and numerical problems.
Cite
@article{arxiv.math/0312166,
title = {Elementary linear algebra for advanced spectral problems},
author = {J. Sjoestrand and M. Zworski},
journal= {arXiv preprint arXiv:math/0312166},
year = {2025}
}
Comments
2 figures