Geodesic
General Linear Problem of the Isomonodromic Deformation of Fuchsian Systems
Matematičeskie zametki, Tome 81 (2007) no. 4, pp. 599-613.

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In contrast to nonresonance systems whose continuous deformations are always Schlesinger deformations, systems with resonances provide great possibilities for deformations. In this case, the number of continuous parameters of deformation, in addition to the location of the poles of the system, includes the data describing the Levelt structure of the system, or, in other words, the distribution of resonance directions in the space of solutions. The question of classifying the form and structure of deformations according to these parameters arises. In the present paper, we consider continuous isomonodromic deformations of Fuchsian systems, including those with respect to additional parameters, describe the corresponding linear problem, and present the Pfaff form of the linear problem of general continuous isomonodromic deformation of Fuchsian systems.
Keywords: Fuchsian equations and systems, Levelt normalization, gauge transformation, resonance singular point
Mots-clés : isomonodromic deformation, Pfaff form. 
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V. A. Poberezhnyi. General Linear Problem of the Isomonodromic Deformation of Fuchsian Systems. Matematičeskie zametki, Tome 81 (2007) no. 4, pp. 599-613. http://geodesic.mathdoc.fr/item/MZM_2007_81_4_a12/

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