Essential numerical ranges for linear operator pencils
(2019)
Journal Article
Boegli, S., & Marletta, M. (2020). Essential numerical ranges for linear operator pencils. IMA Journal of Numerical Analysis, 40(4), 2256-2308. https://doi.org/10.1093/imanum/drz049
We introduce concepts of essential numerical range for the linear operator pencil λ↦A−λB. In contrast to the operator essential numerical range, the pencil essential numerical ranges are, in general, neither convex nor even connected. The new concep... Read More about Essential numerical ranges for linear operator pencils.