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First Author:
 
Michael Zarichnyi
University of Rzeszow, Lviv National University
mzar@litech.lviv.ua
 
Department of Mathematics, Lviv National University, 1 Universytetska Str.
Lviv, 79000, Ukraine
 
 
 

Second Author:

Oleksandra Hubal
Lviv National University
topology@franko.lviv.ua
 
Department of Mathematics, Lviv National University, 1 Universytetska Str.
Lviv, 79000, Ukraine
 
+380322964218(Phone)