Separability and Estimates for Eigenvalues and Singular Numbers of a Class of Hyperbolic‐Type Differential Operators
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DOI: 10.1002/mma.10829
Abstract: In this paper, we study the spectral properties of a class of differential operators of hyperbolic type with variable unbounded coefficients. We find conditions for the existence of a resolvent and maximum regularity of solutions.… read more here.
Keywords: hyperbolic type; estimates eigenvalues; separability estimates; class ... See more keywords
Estimates for Eigenvalues of Sturm--Liouville Operators with some PT-Symmetric Potentials
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DOI: 10.15672/hujms.1542854
Abstract: We provide some useful equations for calculating the periodic and antiperiodic eigenvalues of the one-dimensional Schrödinger operator S(q) with a special potential that is a PT-symmetric trigonometric polynomial. We even give estimates to approximate complex… read more here.
Keywords: eigenvalues sturm; estimates eigenvalues; liouville operators; operators symmetric ... See more keywords