Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8906144 | Indagationes Mathematicae | 2017 | 14 Pages |
Abstract
In this paper, we give some new results on the spectral theory for some operator matrices. It focuses on the theory of the measure of non strict singularity which amounts to study the stability of the Schechter essential spectrum of unbounded block 2Ã2 operator matrix in terms of the union of the Schechter essential spectrum of its diagonal operators entries. This result is tested for two-group transport operator model.
Keywords
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Physical Sciences and Engineering
Mathematics
Mathematics (General)
Authors
Nedra Moalla, Ines Walha,