The members of the DEU Arithmetic group are the faculty members and students who are working on topics based on any arithmetic motivation. Our goal is to organize weekly seminars and to get closely acquainted with recent topics and progress related to arithmetic, and to learn them. In time, we plan to work on analytic number theory, algebraic number theory, harmonic analysis, sieve methods, zeta functions and rational points on curves. Participation of the students and from outside are important for us. Also, our objective is to organize workshops (Arithmetica Izmir) that last one or two days in each semester. In the seminars and workshops, we aim the emergence of new questions and to bring together the people who are interested in these questions.