Drazin inverses of the sum of four matrices and its applications

Daochang Zhang, Dijana Mosi\' c, Li Guo

Our aim is to establish relations between Drazin inverses of the pesudo-block matrix $(P,Q,R,S)$ and the block matrix composed of $P,R,S,Q$, where $R^2=S^2=0$. Based on the relatio…