%0 Journal Article %T $\mathcal{X}$-injective and $\mathcal{X}$-projective complexes %J Bulletin of the Iranian Mathematical Society %I Iranian Mathematical Society (IMS) %Z 1017-060X %A Özen, T. %A ‎Yıldırım, E. %D 2016 %\ 10/01/2016 %V 42 %N 5 %P 1221-1235 %! $\mathcal{X}$-injective and $\mathcal{X}$-projective complexes %K Injective (Projective) complex‎ %K precover‎ %K preenvelope %R %X Let $\mathcal{X}$ be a class of $R$-modules‎. ‎In this paper‎, ‎we investigate \;$\mathcal{X}$-injective (projective) and DG-$\mathcal{X}$-injective (projective) complexes which are generalizations of injective (projective) and DG-injecti‎‎ve (projective) complexes‎. ‎We prove that some known results can be extended to the class of \;$\mathcal{X}$-injective (projective) and DG-$\mathcal{X}$-injective (projective) complexes for this general settings. %U http://bims.iranjournals.ir/article_876_bcc953321d1ed4f3a9c517d160fe4c40.pdf