p-closure in pseudo bci-algebras

In this paper, for any non-empty subset c of a pseudo bci-algebra x, the concept of p-closure of c, denoted by c pc, is introduced and some related properties are investigated. applying this concept, a characterization of the minimal elements of x is given. it is proved that c ^pc is the least closed pseudo bci-ideal of x containing c and k(x) for any ideal c of x. finally, by using the concept of p-closure, a closure operator is introduced.