| The theory of prime ends was developed by Caratheodory. This paper shows that the definition and examples of prime end and gives the connectivity and properties of impression.THEOREM 1 let U ? C) be a simply connected domain such that K = C)\U contains more than one point and let P be a prime end of U . Then the impression I ( p) contains at most two points at which K is locally connected.THEOREM 2 The set K is locally connected if and only if every prime end impression is trivial.THEOREM 3 Let Q1 , Q2,L QnLbe a sequence of chains such that(a) for all n, Q n+1is a looped refinement of Q n(b) for all n, the radius of each link of Q n isTHEOREM 4 Let f be a conformal map of D onto G and let the prime end P be symmetric, Ifξ≠ξ′,and if E is a continuum withAt the same time, it shows properties of that impression of the prime end . This is useful for study of the boundary. |