Reverse order law for reflexive generalized inverses of products of matrices

Abstract The relationships between generalized inverses of the product of two matrices A . B and the product of generalized inverses of A , B have been studied in the literature. By applying the product singular value decomposition (P-SVD), in this paper we derive equivalent conditions for B {1, 2} A {1, 2} ⊆ ( AB ){1, 2}, ( AB ){1, 2} ⊆ B {1, 2} A {1, 2}, B {1, 2} A {1, 2} = ( AB ){1, 2}, and equivalent conditions for ( AB ){1} ⊆ B {1} A {1}.