Some fixed point theorems for suzuki type nonexpansive mappings

The main purpose of fixed point theory is to determine the appropriate conditions to be put on the mapping or on the space where the mapping is defined in order for the mapping to have a fixed point. After the existence of the fixed point is guaranteed, it can be determined how to reach this fixed point using iteration methods. Under this approach, many fixed point theorems have been proved by defining new iteration methods by many authors and examining these methods for certain mappings classes. This thesis consists of five chapters. In the first chapter, fixed point theory, its importance, usage areas and previous studies are mentioned. In the second chapter, basic definitions and theorems that will be used in the following chapters are given. In the third chapter, some iteration methods available in the literature are given, the new iteration method is introduced and convergence, rate of convergence, and stability results are obtained for this iteration method. In the fourth chapter, strong and weak convergence theorems have been proved for Suzuki generalized nonexpansive mappings using the newly defined iteration method, and a numerical example is given for these mappings. In the last chapter, the results obtained from this thesis are summarized and studies that can be done in the future are expressed.