Functional Equations — Results and Advances

The theory of functional equations has been developed in a rapid and productive way in the second half of the 20th century. This is due to the fact that the mathematical applications increased the number of investigations of newer and newer types of functional equations. At the same time, the self-development of this theory was also very fruitful. The material of this volume reflects the complexity and applicability of the most active research fields. The results and methods contained give a representative cross-section of what is happening in the theory of functional equations.