ROUGH SETS, ROUGH RELATIONS AND ROUGH FUNCTIONS
Zdzisław Pawlak · Fundamenta Informaticae · 1996
The paper explores the concepts of approximate relations and functions in the framework of the theory of rough sets. The difficulties with the application of the idea of rough relation to general rough function definition are discussed. The definition of rough function for the domain of real numbers is introduced and its properties are investigated in detail including the generalization of the standard notion of function continuity known in the theory of real functions.