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Статья

Various versions of the Riemann-Hilbert problem for linear differential equations

Russian Mathematical Surveys. 2008. Vol. 63. No. 4. P. 603-639.
V A Poberezhnyi, R R Gontsov.

A counterexample to Hilbert's 21st problem was found by Bolibrukh in 1988 (and published in 1989). In the further study of this problem he substantially developed the approach using holomorphic vector bundles and meromorphic connections. Here the best-known results of the past that were obtained by using this approach (both for Hilbert's 21st problem and for certain generalizations) are presented.