Yasser Fathi Ibrahim Abdelwahab <br/><br/>
On projective modules and quasi-frobenius rings /  
 أنماط من التشكيلات الاسقاطية و اشباه الحلقات الفروبينية 
Yasser Fathi Ibrahim Abdelwahab ; Supervised Ismail A. Amin , Mohamed F. Yousif 
 - Cairo :   Yasser Fathi Ibrahim Abdelwahab ,   2012 
 - 144 P. ;   25cm 
<br/><br/>Thesis (Ph.D.) - Cairo University - Faculty of Science - Department of Mathematics 
<br/><br/> Injective modules and their dual projective modules play a central role in the theory of rings and modules. Both notions are used to characterize semisimple artinian rings. a class of rings that is easily described in the literature as direct sums of matrix rings over division rings. While, a result of eckmann and schopf asserts that, every right R-module M can be embedded in an injective envelope (hull) of M, the situation is different when it comes to projective modules 
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<br/><br/><label>Subjects--Index Terms: </label>Injective and projective modules Rad-projective and strongly rad-projective modules Soc-injective modules