Abstract
This paper is concerned with second order matrix differential systems involving a parameter together with boundary conditions specified at two points. The object of the paper is to establish sufficient conditions for the existence of eigenvalues for the system. Although such problems have been considered using the results of and techniques from the calculus of variations, the methods and results here are entirely in the context of ordinary differential equations. Use is made of the matrix generalization of the polar coordinate transformation introduced by J. H. Barrett and the unitary transformation suggested by F. V. Atkinson and V. A. JakuboviÄ. The sufficient conditions for the existence of eigenvalues obtained here represent certain extensions of W. M. Whyburnâs work concerning linear and nonlinear boundary problems for second order differential systems.
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