We show that, by using the Galois differential theory, one can substantially improve the description of algebraic-geometric operators. In particular, we give a complete description of all elementary algebraic-geometric operators, present simple relations for the construction of all second-order operators of this type, and give a criterion for testing the algebraic-geometric properties of a linear differential operator with meromorphic coefficients.
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References
G. Floquet, “Sur la théorie des équations differentielles linéaries,” Ann. Sci. Ecole Norm. Supér, 8, Suppl., 1–132 (1979).
R. Weikard, “On common differential operators,” Electron. J. Different. Equat., Paper No. 19, 1–11 (2000).
R. Weikard, “On rational and periodic solutions of stationary KdV equations,” Doc. Math. J., 5, 109–126 (2000).
E. R. Kolchin, Differential Algebra and Algebraic Groups, Academic Press, New York (1973).
E. T. Whittaker and G. N. Watson, A Course of Modern Analysis. An Introduction to the General Theory of Infinite Processes and of Analytic Functions; with an Account of the Principal Transcendental Functions [Russian translation], Vol. 2, Fizmatgiz, Moscow (1963).
N. V. Grigorenko, “Abelian extensions in the Picard–Vessiot theory,” Mat. Zametki, 17, 113–117 (1975).
J. Kovacic, “Geometric characterization of strongly normal extensions,” Trans. Amer. Math. Soc., 358, 4135–4157 (2006).
M. Ohmiya, “Darboux–Lamé equation and isomonodromic deformations,” Abstr. Appl. Anal., 6, 511–524 (2004).
N. V. Grigorenko, “Criterion for solvability in quadratures and the direct problem of the Galois theory for linear differential equations,” in: Theoretical and Applied Problems in Differential Equations and Algebra [in Russian], Naukova Dumka, Kiev (1978), pp. 71–75.
S. Lang, Algebra [Russian translation], Mir, Moscow (1968).
E. Kamke, Differentialgleichungen Lösungsmethoden und Lösungen [Russian translation], Mir, Moscow (1976).
N. V. Grigorenko, “Logarithmic singularities of Fuchsian equations and a criterion for finiteness of a monodromy group,” Mat. Zametki, 33, 881–884 (1983).
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Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 61, No. 1, pp. 14–27, January, 2009.
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Grigorenko, N.V. Algebraic-geometric operators and Galois differential theory. Ukr Math J 61, 14–29 (2009). https://doi.org/10.1007/s11253-009-0200-6
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DOI: https://doi.org/10.1007/s11253-009-0200-6