I. Introduction:
Since the introduction of the concepts of BCK and BCI algebras ([6,7]) by K. Iseki in 1966, some more systems of similar type have been introduced and studied by a number of authors in the last two decades. K. H. Kim and Y.H. Yon studied dual BCK algebra and M.V. algebra in 2007 ([8]). It is known that BCK-algebras is a proper subclass of BCI-algebras. There are so many generalizations of BCK/BCI-algebras, such as BCH-algebras ([10]), dual BCK-algebras ([8]), d-algebras ([5]), etc. In ([3]), H. S. Kim and Y. H. Kim introduced the concept of BE-algebra as a generalization dual BCK-algebra. S. S. Ahn and Y. H. Kim ([11]) , S. S. Ahn and K. S. So ([12]) introduced the notion of ideals and upper sets in BE-algebra discussed several properties of ideals. A. Walendziak ([1]) introduced the notion of commutative BE-algebras and discussed some of its properties. H. S. Kim and K. J. Lee in ([4]) generalized the notions of upper sets and generalized upper sets and introduced the concept of extended upper sets and with the help of this concept they gave several descriptions of filters in BE-algebras. The concept of CI- algebra has been introduced by B. L. Meng in ([2]) as a generalization of BE-algebra and studied some of its important properties and relations with BE-algebras.