Leonid V. Kritskov, Abdizhahan M. Sarsenbi
Abstract:
We consider the differential equation
with the nonlocal boundary conditions
,
where
.
We prove that if
is irrational then the system of its eigenfunctions is complete and minimal
in
for any
,
but does not constitute a basis.
In the case of a rational value of r we specify the way of choosing
the associated functions which provides the system of all root functions
of the problem forms a basis in
.
Submitted October 17, 2015. Published November 4, 2015.
Math Subject Classifications: 34K08, 34L10, 46B15.
Key Words: ODE with involution; nonlocal boundary-value problem;
basicity of root functions.
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Leonid V. Kritskov Lomonosov Moscow State University Faculty of Computational Mathematics and Cybernetics 119899 Moscow, Russia email: kritskov@cs.msu.ru | |
Abdizhahan M. Sarsenbi Auezov South-Kazakhstan State University Department of Mathematical Methods and Modeling 160012 Shymkent Kazakhstan email: abzhahan@mail.ru |
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