Abstract:
Let B(H) be the set of all bounded linear operators on the complex Hilbert space H. Let A,B∈B(H).By discussing some necessary and sufficient conditions for the existence of Re-nnd solution and hermitian solution of the operator equation AX=B, some necessary and sufficient conditions for the existence of Re-nnd {1}-,{1,3}-,{1,4}-,{1,3,4}-inverses and hermitian {1,3}-,{1,4}-, {1,3,4}-inverses for an operator with closed range are given.