On Nilpotent Polygroups

In this paper we introduce a new de tion for center of a polygroup in a di erent way. Also, we de ne nilpotent polygroup and upper central series of a polygroup.We show that each normal subpolygroup and every qoutient of a polygroup is nilpotent too. Moreover, we prove that each minimal normal subpolygroup of a nilpotent polygroup is contained in the center of it.

کلیدواژه ها:

polygroup ، fundamental relation