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- DINGGONG YANG
- 2002

A subclass Ꮿ p (λ, µ) (p ∈ N, 0 < λ < 1, −λ µ < 1) of p-valently convex functions in the open unit disk U is introduced. The object of the present paper is to discuss some interesting properties of functions belonging to the class Ꮿ p (λ, µ).

- DINGGONG YANG
- 2004

The object of the present paper is to derive certain sufficient conditions for univalence, p-valently starlikeness and p-valently close-to-convexity of analytic functions in the unit disk. Our results extend and improve some results due to Owa [3], Frasin and Darus [2] and Chen [1].

- Neng Xu, Dinggong Yang
- Int. J. Math. Mathematical Sciences
- 2006

- DINGGONG YANG, NENG XU
- 2012

By using the method of differential subordination, we obtain some sufficient conditions for strongly p-valent starlikeness.

- NENG XU, DINGGONG YANG
- 2007

The Carlson-Shaffer operator L(a, c)f = φ(a, c) * f, where f (z) = z + a2z 2 + · · · is analytic in the unit disk E = {z : |z| < 1} and φ(a, c; z) is an incomplete beta function, is used to define the class T (a, c). An analytic function f belongs to T (a, c) if L(a, c)f is starlike in E. The object of the present paper is to derive some properties of… (More)

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