Browder's theorem for 2*2 upper triangular operator matrices
Huaijie Zhong · Fuzhou daxue xuebao. Ziran kexue ban · 2007
Let Mc=A C0 B∈B(XY) be an upper triangular operator acting on the Banach spaces B(XY),this paper explores the condition under which Browder's theorem survive for upper triangular operator matrices.And by giving a counter-example,the author points out that one of the result(theorem 2.1) in the paper[9] is wrong, and provides a solution.