设H,K为Hilbert空间,L(H,K)为H到K的有界线性算子全体.设A∈L(H)=d L(H,H)及X,Y∈L(K,H)满足条件:R(A)闭,R(X)真包含R(A),R(Y)真包含R(A^*).如果(A-XY^*)^+存在,则可以得到A-XY^*的Moore-Penrose逆的表示.
Let K,H be Hilbert spaces and L(K,H) the set of all bounded linear operators from K to H.A∈L(H)=d L(H,H) with R(A) closed and X,Y∈L(K,H) with R(X)lohtain in R(A),R(Y)lohtain in R(A^*).In this paper,the representation of Moore-Penrose inverse of A-XY^* is obtained if it exists.