대한수학회보 (Bulletin of the Korean Mathematical Society)

  • 제32권2호
  • /
  • Pages.201-204
  • /
  • 1995
  • /
  • 1015-8634(pISSN)
  • /
  • 2234-3016(eISSN)
대한수학회 (Korean Mathematical Society)
권호 표지

A PROPERTY OF CERTAIN ANALYTIC FUNCTIONS

  • Shigeyoshi Owa (Department of Mathemacis, Kinki University, Higashi-Osaka, Osaka 577, Japan) ;
  • Kang, Jin-Sook (Department of Mathematics, Pusan National University, Pusan 609-735)
  • 발행 : 1995.08.01
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초록

Let N be the class of functions of the form $$ (1.1) p(z) = 1 + p_1 z + p_2 z^2 + \cdots $$ which are analytic in the open unit disk $U = {z : $\mid$z$\mid$ < 1}$. If $p(z) \in N$ satisfies $Rep(z) > 0 (z \in U)$, then p(z) is called a Caratheodory function (cf. Goodman [2]).

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