In the present paper we introduce the generalized inverse operators which have an interesting role in operator theory. We establish Douglas' factorization theorem type for Hilbert pro-$C^{ \ast}$-module. We introduce the notion of atomic system and of $K$-frame in Hilbert pro-$C^{ \ast}$-module and we study the relationship between them. We also demonstrat some properties of $K$-frame by using Douglas' factorization theorem.Finally we demonstrate that the sum of two $K$-frames in a Hilbert pro-$C^{ \ast}$-module with certain conditions is once again a $K$-frame.
Categories: math.FA