1. V.I. Romanovskiy Institute of Mathematics, Uzbekistan Academy of Sciences, 9, University str., 100174, Tashkent, Uzbekistan, Akfa University, 264, National Park Street, Barkamol MFY, Yangiabad village, Qibray district,111221, Tashkent region, Uzbekistan, National University of Uzbekistan, 4, University str., 100174, Tashkent, Uzbekistan. ,
2. Faculty of Mathematics, Karshi State University, 17, Karabag str., 180100, Karshi, Uzbekistan.