پديدآورندگان :
GHAZAVI S. H. Department of Mathematics, Shahid Ashrafi Esfahani University, Esfahan, Iran , MIRVAKILI S. Department of Mathematics, Payame Noor University, P. O. Box 19395-3697, Tehran, Iran
كليدواژه :
Semihypergroup , $EL^2$ , semihypergroup , Ends lemma