Turkish Journal of Mathematics
Abstract
In this paper, we review the approach presented by An and Heo on the study of Weyl-type theorems for self-adjoint operators on Krein spaces and show that this approach is not appropriate due to a fallacy. Motivated by this fact, we define a new modification of the kernel of a bounded linear operator on a Krein space, namely $J$-kernel, which allows us to successfully introduce a Fredholm theory in this context and study some variations of Weyl-type theorems for bounded linear operators defined on these spaces. In addition, we will describe the $J$-index in terms of solution sets of homogeneous equations.
DOI
10.55730/1300-0098.3294
Keywords
Fredholm theory, Krein space, Weyl's theorem, homogeneous equation
First Page
2677
Last Page
2689
Recommended Citation
OJITO, D. P, SANABRIA, J, & BUELVAS, Y. O (2022). A Fredholm theory on Krein spaces and its application to Weyl-type theorems and homogeneous equations. Turkish Journal of Mathematics 46 (7): 2677-2689. https://doi.org/10.55730/1300-0098.3294
