Aiping Wang, Anton Zettl
We characterize the two point boundary conditions which determine symmetric ordinary differential operators of any order, even or odd, with complex coefficients and arbitrary deficiency index, in a Hilbert space.The self-adjoint characterizations are a special case.
Submitted September 14, 2017. Published January 10, 2018.
Math Subject Classifications: 34B20, 34B24, 47B25.
Key Words: Symmetric domains; differential operators; LC solutions.
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| Aiping Wang |
School of Mathematics and Physics
North China Electric Power University
Beijing 102206, China
| Anton Zettl |
Math. Dept., Northern Illinois University
DeKalb, IL 60115, USA
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