HUANG Zhi-gang1,YU Yun-ni2(1.Department of Mathematics,University of Science and Technology of Suzhou,Suzhou 215011,China;2.Nanchang Teachers College,Nanchang 330029,China)
Abstract:Let G be a semigroup generated by a family of transcendental entire functions with the semigroup operation being functional composition.It is shown that if H is a finite index or cofinite index subsemigroup of G,then F(H)=F(G).Let U be a connected compone