Geodesic
On a singular nonlinear self-adjoint spectral problem for differential-algebraic systems of equations
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 50 (2010) no. 2, pp. 249-254 Cet article a éte moissonné depuis la source Math-Net.Ru

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The general nonlinear self-adjoint eigenvalue problem for a differential algebraic system of equations on a half-line is examined. The boundary conditions are chosen so that the solution to this system is bounded at infinity. Under certain assumptions, the original problem can be reduced to a self-adjoint system of differential equations. After certain transformations, this system, combined with the boundary conditions, forms a nonlinear self-adjoint eigenvalue problem. Requirements for the appropriate boundary conditions are clarified. Under the additional assumption that the initial data are monotone functions of the spectral parameter, a method is proposed for calculating the number of eigenvalues of the original problem that lie on a prescribed interval of this parameter. 
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A. A. Abramov; V. I. Ul'yanova; L. F. Yukhno. On a singular nonlinear self-adjoint spectral problem for differential-algebraic systems of equations. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 50 (2010) no. 2, pp. 249-254. http://geodesic.mathdoc.fr/item/ZVMMF_2010_50_2_a4/

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