4th INTERNATIONAL CONFERENCE ON MATHEMATICS “An Istanbul Meeting for World Mathematicians” 27-30 October 2020, Istanbul, Turkey This conference is dedicated to 67th birthday of Prof. M. Mursaleen ICOM 2020 ISTANBUL / TURKEY 4th International Conference on Mathematics “An Istanbul Meeting for World Mathematicians” ICOM 2020 ICOM 2020 Conference Abstracts Book ISBN: 978-, İstanbul, Türkiye, 27 Ekim 2020, ss.135