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- Hari M. Srivastava, Ding-Gong Yang, N.-Eng Xu
- Applied Mathematics and Computation
- 2008

Let Rp denote the class of functions normalized by 0096-3 doi:10. * Co E-m f ðzÞ 1⁄4 z p þ X1 n1⁄41 anz p ðp 2 N :1⁄4 f1; 2; 3; . . .gÞ; which are analytic and p-valent in 0 < jzj < 1. Making use of a linear operator, which is defined here by means of the Hadamard product (or convolution), we introduce some new subclasses of the meromorphically p-valent… (More)

- DING-GONG YANG
- 2007

Making use of a linear operator, which is defined here by means of the Hadamard product (or convolution), we introduce a class Qp(a, c;h) of analytic and multivalent functions in the open unit disk. An inclusion relation and a convolution property for the class Qp(a, c;h) are presented. Some integral-preserving properties are also given.

- N.-Eng Xu, Ding-Gong Yang
- Mathematical and Computer Modelling
- 2009

- Ding-Gong Yang, Jin-Lin Liu
- Mathematical and Computer Modelling
- 2010

Let Ss(α) (0≤α< 1/2) be the class of functions f(z)= z+··· which are analytic in the unit disk and satisfy there Re{zf ′(z)/(f (z)−f(−z))} > α. In the present paper, we find the sharp lower bound on Re{(f (z)−f(−z))/z} and investigate two subclasses S0(α) and T0(α) of Ss(α). We derive sharp distortion inequalities and some properties of the partial sums for… (More)

- Ding-Gong Yang, Jin-Lin Liu
- Computers & Mathematics with Applications
- 2010

- Ding-Gong Yang, Jin-Lin Liu
- Applied Mathematics and Computation
- 2008

- N-ENG XU, DING-GONG YANG
- 2013

Let Ap(p ∈ N) be the class of functions f(z) = z + ∑∞ m=1 ap+mz p+m which are analytic in the unit disk. By virtue of the Ruscheweyh derivatives we introduce the new subclasses Cp(n, α, β, λ, μ) of Ap. Subordination relations, inclusion relations, convolution properties and a sharp coefficient estimate are obtained. We also give a sufficient condition for a… (More)

- Ding-Gong Yang, Jin-Lin Liu
- Applied Mathematics and Computation
- 2011

- Ding-Gong Yang, Jin-Lin Liu
- Applied Mathematics and Computation
- 2010

and Applied Analysis 3 2. The bounds on Ref ′ z , Re f z /z , and |f z | in Tn A,B, γ, α In this section, we let λm ( A,B, γ ) ⎧ ⎪ ⎪⎨ ⎪ ⎪⎩ m ∑ j 0 ⎛ ⎝ γ j ⎞ ⎠ ⎛ ⎝ −γ m − j ⎞ ⎠AjBm−j , ( A ≤ 1; 0 < γ < 1, A − B −B m−1, γ 1, 2.1

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