Bohdan Zabavsky 
Vasyl’ Petrychkovych 

Professor Department of Algebra and Logic Faculty of Mechanics and Mathematics Ivan Franko National University of Lviv email: zabavskii at gmail.com 
Professor Department of Algebra Pidstryhach Institute for Applied Problems of Mechanics and Mathematics National Academy of Sciences of Ukraine email: vpetrych at iapmm.lviv.ua 

Andriy Gatalevych 
Volodymyr Shchedryk 

Associate Professor Department of Algebra and Logic Faculty of Mechanics and Mathematics Ivan Franko National University of Lviv email: gatalevych at ukr.net 
Senior Research Fellow Department of Algebra Pidstryhach Institute for Applied Problems of Mechanics and Mathematics National Academy of Sciences of Ukraine email: shchedrykv at ukr.net 

Volodymyr Zelisko 
Nataliia Dzhaliuk 

Associate Professor Department of Algebra and Logic Faculty of Mechanics and Mathematics Ivan Franko National University of Lviv email: zelisko_vol at yahoo.com 
Associate Professor Department of Algebra Pidstryhach Institute for Applied Problems of Mechanics and Mathematics National Academy of Sciences of Ukraine email: nataliya.dzhalyuk at gmail.com 

Yurii Ishchuk 
Andrij Romaniv 

Associate Professor Department of Algebra and Logic Faculty of Mechanics and Mathematics Ivan Franko National University of Lviv email: yu.ishchuk at gmail.com 
PhD Department of Algebra Pidstryhach Institute for Applied Problems of Mechanics and Mathematics National Academy of Sciences of Ukraine email: romaniv_a at ukr.net 

Ivanna Melnyk 
Nataliya Ladzoryshyn 

Associate Professor Department of Algebra and Logic Faculty of Mechanics and Mathematics Ivan Franko National University of Lviv email: ivannamelnyk at yahoo.com 
MSc Department of Algebra Pidstryhach Institute for Applied Problems of Mechanics and Mathematics National Academy of Sciences of Ukraine email: natalja.ladzoryshyn at gmail.com 

Marta MaloidGlebova 
Bogdan Shavarovskii 

Teaching assistant Department of Algebra and Logic Faculty of Mechanics and Mathematics Ivan Franko National University of Lviv email: martamaloid at gmail.com 
Senior Research Fellow Department of Algebra Pidstryhach Institute for Applied Problems of Mechanics and Mathematics National Academy of Sciences of Ukraine email: bshavarovskii at gmail.com 

Vasyl’ Fedorchuk 
Volodymyr Fedorchuk 

Extraordinary Professor, Institute of Mathematics, Pedagogical University of Kraków, Poland; Senior Research Fellow, Department of Algebra Pidstryhach IAPMM of NAS of Ukraine email: vasfed at gmail.com 
PhD Department of Algebra Pidstryhach Institute for Applied Problems of Mechanics and Mathematics National Academy of Sciences of Ukraine email: volfed at gmail.com 

Andriy Sagan 

PhD student Department of Algebra and Logic Faculty of Mechanics and Mathematics Ivan Franko National University of Lviv email: andrij.sagan at gmail.com 
