Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10224148 | Journal of Mathematical Analysis and Applications | 2018 | 10 Pages |
Abstract
We prove that all possible values of the deficiency indices r,s of a symmetric (formally self-adjoint) differential expression M with complex coefficients which satisfy the well known inequalities are realized. Subject to these inequalities, in 1974 Kogan and Rofe-Beketov showed that all values of r,s which differ by no more than 1 can be realized, in 1978, 1979 Gilbert showed that their difference can be arbitrarily large provided the order of M is large enough. In this paper we show that all values of r and s are realized.
Related Topics
Physical Sciences and Engineering
Mathematics
Analysis
Authors
Aiping Wang, Anton Zettl,