Michael Th. Rassias has received several awards in mathematical problem solving competitions including two gold medals at the Pan-Hellenic Mathematical Competitions of 2002 and 2003 held in Athens, a silver medal at the Balkan Mathematical Olympiad of 2002 held in Targu Mures, Romania and a silver medal at the 44th International Mathematical Olympiad of 2003 held in Tokyo, Japan.
Number Theory problems are among the most tricky in Mathematical Olympiads (MO). For students who are going to participate in such a tournament, and also for their teachers, a book that covers the main topics of fundamental number theory and contains various problems related to MOs is very useful. The book under review is exactly such a friendly volume, arranged in two main parts: Topics and Problems...The book under review is not the only book which focuses on olympiad problems in number theory, but because of its structure (containing topics and problems), it is also useful for teaching. I highly recommend this book for students and teachers of MOs. --Mehdi Hassani, MAA Reviews This book has a few particular characteristics which make it unique among similar problem books... [He] focused on problems of number theory, which was the field of mathematics that began to capture his passion. It appears like a confession of a young mathematician to students of his age, revealing to them some of his preferred topics in number theory based on solutions of particular problems... Michael does not limit himself to those particular problems. He also deals with topics in classical number theory and provided extensive proofs of the results...It offers pleasant reading for young people who are interested in mathematics. They will be guided to easy comprehension of some of the jewels of number theory. --Preda Mihailescu, EMS Newsletter March 2011 Number theory is one of the most active and important fields in Mathematics with a substantial and large variety of applications in several disciplines including representation theory, cryptography, coding theory, dynamical systems, [and] theoretical physics. The present book provides a wonderful presentation of concepts and ideas as well as problems with their solutions in Number Theory. Although most of the problems solved in this book were given in international mathematical contests and hence are of high level of complexity, the author has succeeded in providing solutions and extensive step-by-step proofs in a rigorous yet very simple and fascinating way. Even though the author is a very young mathematician! he is an outstanding specialist in this field. --Dorin Andrica, Zentralblatt MATH