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Journal Article
A Characterization of Positive Self-Adjoint Extensions and Its Application to Ordinary Differential Operators
Guangsheng Wei and Yaolin Jiang
Proceedings of the American Mathematical Society
Vol. 133, No. 10 (Oct., 2005), pp. 2985-2995
Published
by: American Mathematical Society
https://www.jstor.org/stable/4097913
Page Count: 11
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Topics: Differential operators, Adjoints, Boundary conditions, Inner products, Eigenvalues, Hilbert spaces, Abstracting, Linear transformations, Operator theory, Differential equations
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Abstract
A new characterization of the positive self-adjoint extensions of symmetric operators, T0, is presented, which is based on the Friedrichs extension of T0, a direct sum decomposition of domain of the adjoint $T_0^*$ and the boundary mapping of $T_0^*$. In applying this result to ordinary differential equations, we characterize all positive self-adjoint extensions of symmetric regular differential operators of order 2n in terms of boundary conditions.
Proceedings of the American Mathematical Society
© 2005 American Mathematical Society