# Editorial Team

**Editors-in-Chief:** M.M. Sheremeta (Lviv), O.B. Skaskiv (Lviv), M.M. Zarichnyi (Lviv)

#### Section Editors:

- Oleh Skaskiv (Function Theory and Complex Analysis), professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)
- Michael Zarichnyi (Topology), professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)
- Taras Banakh (Topology), professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)
- Mykola Bokalo (Differential Equations), professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)
- Oleh Storozh (Functional Analysis), professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)
- Myroslav Sheremeta (Function Theory and Complex Analysis), professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)
- Yaroslav Mykytyuk (Functional Analysis), professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)
- Igor Chyzhykov (Function Theory and Complex Analysis), professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)
- Orest Artemovych (Algebra), professor (Cracow University of Technology, Kraków, Poland)
- Oleh Lopushansky (Functional Analysis), professor (Institute of Mathematics, Rzeszow University, Rzeszow, Poland)
- Yuriy Golovaty (Differential Equations), professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)
- Rostyslav Hryniv (Functional Analysis), professor (Institute of Mathematics, Rzeszow University, Rzeszow, Poland; Pidstryhach Institute for Applied Problems of Mechanics and Mathematics, Lviv, Ukraine)
- Anatolii Korenovskii (Function Theory and Complex Analysis), professor (Department of Mathematics, Physics and Information Technologies, Odesa I.I.Mechnikov National University, Odesa, Ukraine)
- Misha Popov (Functional Analysis), professor (Pomeranian University in Słupsk, Słupsk, Poland)
- Serguei Ivashkovych (Function Theory and Complex Analisys), professor (Laboratoire de mathématiques Paul Painlevé, University Lille 1, Lille, France)
- Andrey Dorogovtsev (Probability Theory), professor (Institute of Mathematics, National Academy of Sciences of Ukraine, Kyiv, Ukraine)
- Bohdan Kopytko (Probability Theory), professor (Institute of Mathematics, Czestochowa University of Technology, Czestochowa, Poland)
- Alexander Rashkovskii (Function Theory and Complex Analisys), professor (Department of Mathematics and Physics, University of Stavanger, Stavanger, Norway)
- Volodymyr Kyrylych (Differential Equations), professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)
- Bogdan Zabavskiy (Algebra), professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)
- Bogdana Oliynyk (Algebra), professor (Department of Mathematics, National University of Kyiv-Mohyla Academy, Kyiv, Ukraine)
- Andriy Zagorodnyuk (Functional Analysis), professor (Faculty of Mathematics and Computer Science, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine)

#### Editorial Board

**O.D. Artemovych**, professor (Cracow University of Technology, Kraków, Poland)**T.O. Banakh**, professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine; Jan Kochanowski University in Kielce, Kielce, Poland)**M.M. Bokalo**, professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)**I.E. Chyzhykov**, professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv Lviv, Ukraine; University of Warmia and Mazury in Olsztyn, Olsztyn, Poland)**A.A. Dorogovtsev**, professor (Institute of Mathematics, National Academy of Sciences of Ukraine, Kyiv, Ukraine)**Yu.A. Drozd**, professor (Institute of Mathematics, National Academy of Sciences of Ukraine, Kyiv, Ukraine)**S.Yu. Favorov**, professor (Department of Mathematics and Computer Sciences, Karazin Kharkiv National University, Kharkiv, Ukraine)**Y.D. Golovaty**, associate professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)**R.I. Grigorchuk**, professor (Steklov Mathematical institute, Russian Academy of Sciences, Moscow, Russia)**I.Yo. Guran**, associate professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)**R.O. Hryniv**, professor (Institute of Mathematics, Rzeszow University, Rzeszow, Poland; Pidstryhach Institute for Applied Problems of Mechanics and Mathematics, Lviv, Ukraine)**S.D. Ivasyshen**, professor (National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine)**S.M. Ivashkovych**, professor (Laboratoire de mathématiques Paul Painlevé, University Lille 1, Lille, France)**B.N. Khabibullin**, professor (Department of Mathematics and Information Technologies,Bashkir State University, Ufa, Russia)**V.V. Kirichenko,**professor (Department of Mechanics and Mathematics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine)**B.I. Kopytko**, professor (Institute of Mathematics, Czestochowa University of Technology, Czestochowa, Poland)**A.A. Korenovskii**, professor (Department of Mathematics, Physics and Information Technologies, Odesa I.I.Mechnikov National University, Odesa, Ukraine)**O.V. Lopushansky**, professor (Institute of Mathematics, Rzeszow University, Rzeszow, Poland)**O.V. Maslyuchenko**, professor (Institute of Mathematics, University of Silesia in Katowice, Katowice, Poland)**Ya.V. Mykytyuk**, associate professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)**B. V. Oliynyk,**professor (Department of Mathematics, National University of Kyiv-Mohyla Academy, Kyiv, Ukraine)**I.V. Ostrovskii,**professor (Department of Mathematics, Bilkent University, Ankara, Turkey)**O.A. Pankov**, professor (Morgan State University, Baltimore, USA)**M.M. Popov**, professor (Pomeranian University in Słupsk, Słupsk, Poland)**I.V. Protasov**, professor (Department of Computer Science and Cybernetics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine)**A. Rashkovskii**, professor (Department of Mathematics and Physics, University of Stavanger, Stavanger, Norway)**D. Repovš**, professor (Institute of Mathematics, Physics and Mechanics, University of Ljubljana, Slovenia)**V.G. Samoylenko**, professor (Department of Mechanics and Mathematics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine)**A.M. Sedletskii**, professor (Department of Mechanics and Mathematics, Lomonosov Moscow State University, Moscow, Russia)**S. Stepin**, professor (Department of Mechanics and Mathematics, Lomonosov Moscow State University, Moscow, Russia, and University of Bialystok, Bialystok, Poland)**O.G. Storozh**, professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)**A.V. Zagorodnyuk**, professor (Faculty of Mathematics and Computer Science, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine)**B.V. Zabavskyi,**professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine)

**Technical editors:**

Andriy Bandura, professor (Department of Advanced Mathematics, Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Ukraine),

Andriy Kuryliak, associate professor (Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine),

Dmytro Zikrach (JSC SoftServe, Lviv, Ukraine).