Iranian Mathematical Society (IMS) Bulletin of the Iranian Mathematical Society 1017-060X 38 1 2012 04 01 Application of fundamental relations on n-ary polygroups169 184 en S. Mirvakili Payame Noor University B. Davvaz Yazd University 2009 04 30 Hypergroup polygroup $n$-ary hypergroup $n$-ary polygroup derived $n$-ary subgroup fundamental relation