Abstract
A ring R is called NEC if for any a, b ? N(R), ab = ba. The class of NEC
rings is a proper generalization of the class of CN rings. First, with the
aid of NEC rings, some characterizations of CN rings and reduced rings are
given. Next we extend many properties of CN rings to NEC rings such as we
show that NEC rings are directly finite and left min-abel; NEC regular ring
are strongly regular; a ring R is NEC if and only if every Pierce stalk of
R is NEC; Also we discuss some properties of NEC exchange rings; Finally, we
give some properities of MP-invertible elements.
Publisher
National Library of Serbia