Abstract
Laurent solutions of systems of linear ordinary differential equations with truncated power series as coefficients are considered. The Laurent series in the solutions are also truncated. As a means for constructing such solutions, induced recurrent systems are used; earlier, an algorithm for the case when the induced recurrent system has a nonsingular leading matrix was proposed. For the series in solutions, this algorithm finds the maximum possible number of terms that are invariant with respect to any prolongation of the truncated coefficients of the original system. Results on extending the applicability of the earlier proposed algorithm to the case when the leading matrix is singular using the EG-elimination algorithm as an auxiliary tool. An implementation of the proposed algorithm in the form of a Maple procedure is given and examples of its use are presented.
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The operation of the implementation was also tested in Maple 2022 and Maple 2021; in earlier versions of Maple the implementation can also work correctly, but it was not tested.
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ACKNOWLEDGMENTS
We are grateful to S. A. Abramov for useful discussions of the problem and results.
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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.
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Translated by A. Klimontovich
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Ryabenko, A.A., Khmelnov, D.E. Searching for Laurent Solutions of Truncated Systems of Linear Differential Equations with the Use of EG-Eliminations. Program Comput Soft 50, 188–196 (2024). https://doi.org/10.1134/S0361768824020129
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DOI: https://doi.org/10.1134/S0361768824020129