Iranian Mathematical Society (IMS) Bulletin of the Iranian Mathematical Society 1017-060X 39 1 2013 03 01 The Quasi-morphic Property of Group175 185 en Q. Wang Department of Mathematics and Systems Science, National University of Defense Technology, P.R.China 410073,Changsha, China. K. Long Department of Mathematics and Systems Science, National University of Defense Technology ,P.R.China 410073, Changsha, China. L. Feng Department of Mathematics and Systems Science, National University of Defense Technology, P.R.China 410073, Changsha, China. 2011 05 28 quasi-morphic group finitely generated abelian group normal endomorphism