On open mappings in Banach algebras, II
On open mappings in Banach algebras, II
This paper contains an elementary way to look at the results of [l] and [2].We prove Theorems 4 and S of [2].Let % be a Banach algebra, ƒ a holomorphic function on an open set U in the plane, a£2I, cr(^)CZ7, and f(<r(a))C.f(V)where V is an open set on which …