Editorial.- Survey Papers.- A survey of minimal clones.- General theory of the translation equation.- Some recent applications of functional equations to the social and behavioral sciences. Further problems.- Progress of iteration theory since 1981.- On the representation of integers as sums of triangular numbers.- Chromatic sums revisited.- Conditional functional equations and orthogonal additivity.- Hyers-Ulam stability of functional equations in several variables.- Rep-tiling Euclidean space.Springer Book Archives