Abstract:
We consider the problem of confluence of singular points under isomonodromic deformations of linear systems. We prove that a system with irregular singular points is a result of isomonodromic confluence of singular points with minimal Poincaré ranks, i.e., of singular points whose Poincaré rank does not decrease under gauge transformations.
Keywords:
isomonodromic deformation, linear differential equation, confluence of singular points, Poincaré rank, gauge transformation, monodromy matrix, Fuchsian system.
This publication is cited in the following 2 articles:
Malek S., “On Boundary Layer Expansions For a Singularly Perturbed Problem With Confluent Fuchsian Singularities”, Mathematics, 8:2 (2020), 189
D. V. Anosov, V. P. Leksin, “Andrei Andreevich Bolibrukh's works on the analytic theory of differential equations”, Russian Math. Surveys, 66:1 (2011), 1–33