Geodesic
On the Riemann–Hilbert problem for difference and $q$-difference systems
Informatics and Automation, Order and chaos in dynamical systems, Tome 297 (2017), pp. 326-343 
I. V. Vyugin; R. I. Levin. On the Riemann–Hilbert problem for difference and $q$-difference systems. Informatics and Automation, Order and chaos in dynamical systems, Tome 297 (2017), pp. 326-343. http://geodesic.mathdoc.fr/item/TRSPY_2017_297_a17/
@article{TRSPY_2017_297_a17,
     author = {I. V. Vyugin and R. I. Levin},
     title = {On the {Riemann{\textendash}Hilbert} problem for difference and $q$-difference systems},
     journal = {Informatics and Automation},
     pages = {326--343},
     year = {2017},
     volume = {297},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2017_297_a17/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

We study an analog of the classical Riemann–Hilbert problem stated for the classes of difference and $q$-difference systems. We generalize Birkhoff's existence theorem.

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