Author : Hamead Alhusiny, Amjad
journal of kerbala university,
Volume 9, Issue 0, Pages 38-40
We know that a right R-module C is flat if and only if every short exact sequence O→A→B→C→O of right R-modules is pure. Dually a right R-module A is coflat if ever short exact sequence O→A→B→C→O of right R-modules is copure. Co flat modules are defined in several ways, (as shown in  and ), In this paper it has shown that these definitions are equivalents. And we shell prove that every direct sum of coflat modules is coflat.