Presents recent development and research in the theory of the measure of noncompactness and its applications in pure and applied mathematics. Discusses topics such as measures of noncompactness in the space of regulated functions, application in nonlinear infinite systems of fractional differential equations, coupled fixed point theorem.

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S. A. Mohiuddine is a full Professor of Mathematics at King Abdulaziz University, Jeddah, Saudi Arabia. An active researcher, he has co-authored 5 books: Convergence Methods for Double Sequences and Applications (Springer, 2014), Advances in Summability and Approximation Theory (Springer, 2018), Soft Computing Techniques in Engineering, Health, Mathematical and Social Sciences (CRC Press, Taylor & Francis Group, 2021), Approximation Theory, Sequence Spaces, and Applications (Springer, 2022), Sequence Space Theory with Applications (CRC Press, Taylor & Francis Group, 2023), and a number of chapters in numerous edited books. More than 170 research papers and various leading journals, bear his name.

Mohiuddine is the referee of scientific journals and a member of the editorial boards of those journals, various international scientific bodies and organizing committees. He has visited international universities, including Imperial College London, UK, and served as a guest editor for a number of special journals’ issues. His research interests are: sequence spaces, statistical convergence, matrix transformation, measures of non-compactness and approximation theory. His name has appeared in the prestigious list of World's Top 2% Scientists, compiled by Stanford University in California, USA, via Scopus data provided by Elsevier, for four consecutive years from 2020-2023.

M. Mursaleen, since 1982, has served at Aligarh Muslim University from lecturer to full Professor. From 2915 to 2018, he was Chairman of the Department of Mathematics. He has published 9 books, published more than 400 research papers in several highly reputed journals, and besides Masters’ students, has guided 21 Ph.D. students.

Mursaleen has been a reviewer for various international scientific journals and is a member of numerous editorial boards for various international scientific journals. He has received a number of awards for his research achievements and was recognized as a 2019 Highly Cited Researcher by the Web of Science.

Dragan Djordjević received his degrees in mathematics from the University of Niš Serbia: Bachelors in 1992, Masters in 1996, and a PhD in 1998. He has worked at the University of Niš since 1992, and from 2006, as full Professor at the Faculty of Sciences and Mathematics. He has taught courses in various levels of education (Functional Analysis, Operator Theory, Complex Analysis, Measure and integration, Algebras of Operators) and served as the Dean of the Faculty of Sciences and Mathematics, a member of several scientific boards of the University of Niš (Senat, Scientific Council for Sciences and Mathematics), Ministry of Education, Science and Technological Development of Serbia (Scientific Council for Mathematics, Mechanics and Computer Science, Head of the council), as well as in the Republic of Serbia (National council for higher education). He was the head and member of several scientific projects financed by the Ministry of Education, Science and Technological Development of Serbia. He is a member and vice president of the Association Serbian Scientific Mathematical Society. Djordjevic supervised 10 PhD theses (8 in Niš, 1 in Belgrade and 1 in Skopje). He has published 130 scientific papers, including 104 papers in JCR journals. He has collaborated with more than 30 authors, most of them his students, and his results are cited approximately 1400 times, with a Hirsch index of h=22.

Djordjević has been as an invited speaker for mathematical conferences in Korea, Japan, and Turkey, has organized conferences in mathematical or functional analysis in Niš and Novi Sad, has reviewed papers for mathematical journals, including Mathematical Reviews. His cientific work includes operator theory, with some aspects of functional analysis, linear algebra, general algebra and numerical analysis. His main focus is on operators on Banach and Hilbert spaces, their ordinary and generalized invertibility properties, Fredholm and spectral theory, as well as applications to general ring theory, and operator equations in various structures. He has results related to majorizaion and doubly stochastic operators, theory of spaces with indefinite inner products, and Hilbert C*- modules. Dragan Djordjevic sits on the boards of these mathematical journals: Filomat (one of the editors-in-chief), Functional Analysis, Approximation and Computation (founder, editor-in-chief), Applied Mathematics and Computer Science (founder, one of the editors-in-chief), Advances in the Theory of Nonlinear Analysis and its Application (member of the board), Publications de l'Institute Mathematique (member of the board), and Advances in Operator Theory (member of the board).

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