A Formal Model for Verification of Dynamic Consis tency of KBSs

K e y w o r d s F o r m a l models for KBS's, Formal approach to verification, Algebraic logic. 1. I N T R O D U C T I O N T h e a i m o f t h e p r e s e n t p a p e r is t o p r o p o s e a t r a n s l a t i o n of t h e c o n c e p t s o f f o r w a r d a n d b a c k w a r d r e a s o n i n g c o n s i s t e n c y of K n o w l e d g e B a s e d S y s t e m s ( K B S s ) in to a t h e o r e t i c a l m e t a l a n g u a g e b a s e d o n H a l m o s [1] a n d L e b l a n c ' s [2] " M o n a d i c a n d P o l y a d i c A l g e b r a s . " A few p a p e r s d e a l i n g w i t h t h e We thank the members of the teams of the ESPRIT project VALID, for their help. Our work has been supported by the Spanish Commission for Science CICYT. We also thank the anonymous referee of this paper for his most valuable comments. *Author to whom all correspondence should be addressed. 81 Typeset by ,4A/cS-TEX