We study linear systems of ordinary differential equations of higher order with an identically singular matrix at the higher derivative of the required vector-valued function in the domain of definition. We give definitions of the index and singular points for these systems, formulate the conditions of solvability, and deduce a formula for the general solution. The algorithms for finding the index and singular points are presented.
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Translated from Neliniini Kolyvannya, Vol. 20, No. 2, pp. 274–288, April–June, 2017.
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Chistyakov, V.F., Chistyakova, E.V. Evaluation of the Index and Singular Points of Linear Differential-Algebraic Equations of Higher Order. J Math Sci 231, 827–845 (2018). https://doi.org/10.1007/s10958-018-3852-7
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DOI: https://doi.org/10.1007/s10958-018-3852-7