Completion of Semi-Fredholm of Operator Partial Matrices
Zhang La · Shuxue de shijian yu renshi · 2013
Let H,K,be separable Hilbert spaces,A ∈B(H),B ∈B(H,K,) and D ∈B(K) are given,N_C =(ABCD).In this paper,we give some sufficient condition for Nc to be upper semi-Predholm(lower semi-Predholm,Fredholm)operator for some C ∈B(K,H).