Bull. Korean Math. Soc. 2005 Vol. 42, No. 2, 295-305 Printed June 1, 2005
Huanyin Chen Zhejiang Normal University
Abstract : In this paper, we investigate exchange ideals and get some new characterization of exchange rings. It is shown that an ideal $I$ of a ring $R$ is an exchange ideal if and only if so is $QM_2(I)$. Also we observe that every exchange ideal can be characterized by exchange elements.