Research Article Some Properties of Certain Class of Integral Operators
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1 Hindawi Publishing Corporation Journal of Inequalities and Applications Volume 211, Article ID 53154, 1 pages doi:1.1155/211/53154 Research Article Some Properties of Certain Class of Integral Operators Jian-Rong Zhou, 1 Zhi-Hong Liu, 2 and Zhi-Gang Wang 3 1 Department of Mathematics, Foshan University, Foshan 528, Guangdong, China 2 Department of Mathematics, Honghe University, Mengzi 6611, Yunnan, China 3 School of Mathematics and Computing Science, Changsha University of Science and Technology, Yuntang Campus, Changsha, Hunan 41114, China Correspondence should be addressed to Zhi-Gang Wang, zhigangwang@foxmail.com Received 17 October 21; Accepted 1 January 211 Academic Editor: Andrea Laforgia Copyright q 211 Jian-Rong Zhou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The main object of this paper is to derive some inequality properties and convolution properties of certain class of integral operators defined on the space of meromorphic functions. 1. Introduction and Preliminaries Let Σ denote the class of functions of the form f z 1 z a k z k, 1.1 which are analytic in the punctured open unit disk U : {z : z C, < z < 1} : U \ {}. 1.2 Let f, g Σ, where f is given by 1.1 and g is defined by g z 1 z b k z k. 1.3
2 2 Journal of Inequalities and Applications Then the Hadamard product or convolution f g of the functions f and g is defined by 1 f g z : z a k b k z k : g f z. 1.4 For two functions f and g,analyticinu, we say that the function f is subordinate to g in U and write f z g z, 1.5 if there exists a Schwarz function ω, which is analytic in U with ω, ω z < 1 z U 1.6 such that f z g ω z z U. 1.7 Indeed, it is known that f z g z f g, f U g U. 1.8 Furthermore, if the function g is univalent in U, we have the following equivalence: f z g z f g, f U g U. 1.9 Analogous to the integral operator defined by Jung et al. 1, Lashin 2 recently introduced and investigated the integral operator Q α,β : Σ Σ 1.1 defined, in terms of the familiar Gamma function, by Q α,β f z Γ β α Γ β Γ α 1 z β 1 1 z Γ β α Γ β t β 1 t z α 1 f t dt Γ k β 1 Γ k β α 1 a kz k α>; β>; z U By setting f α,β z : 1 z Γ β Γ β α Γ k β α 1 Γ k β 1 zk α>; β>; z U, 1.12
3 Journal of Inequalities and Applications 3 we define a new function f z in terms of the Hadamard product or convolution α,β f α,β z f α,β z 1 z 1 z α>; β>; >; z U Then, motivated essentially by the operator Q α,β,wangetal. 3 introduced the operator Q α,β : Σ Σ, 1.14 which is defined as Q α,β f z : f α,β z f z 1 z Γ β α Γ β Γ k β 1 k 1! Γ k β α 1 a kz k z U ; f Σ, 1.15 where and throughout this paper unless otherwise mentioned the parameters α, β, and are constrained as follows: α>, β >, > 1.16 and k is the Pochhammer symbol defined by 1 k, k : 1 k 1 k N : {1, 2, } Clearly, we know that Q 1 α,β Q α,β. It is readily verified from 1.15 that z z Q α,β f Q 1 α,β f z 1 Q α,β f z, z z Q α 1,β f β α Q α,β f z β α 1 Q α 1,β f z Recently, Wang et al. 3 obtained several inclusion relationships and integralpreserving properties associated with some subclasses involving the operator Q, some subordination and superordination results involving the operator are also derived. Furthermore, α,β Sun et al. 4 investigated several other subordination and superordination results for the operator Q α,β. In order to derive our mainresults, we need the following lemmas.
4 4 Journal of Inequalities and Applications Lemma 1.1 see 5. Let φ be analytic and convex univalent in U with φ 1. Suppose also that p is analytic in U with p 1. If p z zp z c φ z R c ; c /, 1.2 p z cz c t c 1 φ t dt φ z, 1.21 and cz c tc 1 φ t dt is the best dominant of 1.2. Let P γ γ<1 denote the class of functions of the form p z 1 p 1 z p 2 z 2, 1.22 which are analytic in U and satisfy the condition R p z >γ z U Lemma 1.2 see 6. Let ψ j z P γ j γj < 1; j 1, Then ψ1 ψ 2 z P γ3 γ γ 1 1 γ The result is the best possible. Lemma 1.3 see 7. Let p z 1 p 1 z p 2 z 2 P γ γ< Then R p z > 2γ γ 1 z In the present paper, we aim at proving some inequality properties and convolution properties of the integral operator Q α,β.
5 Journal of Inequalities and Applications 5 2. Main Results Our first main result is given by Theorem 2.1 below. Theorem 2.1. Let μ<1and 1 B<A 1. Iff Σ satisfies the condition [ 1 ] 1 α,β f z μq α,β f z 1 Az 1 Bz 2.1 1/n R zq α,β f z > 1/n 1 Au u du / 1 μ 1 n Bu The result is sharp. Proof. Suppose that p z : zq α,β f z z U; f Σ. 2.3 Then p is analytic in U with p 1. Combining 1.18 and 2.3, wefindthat α,β f z p z zp z. 2.4 zq 1 From 2.1, 2.3, and 2.4,weget p z 1 Az zp z 1 Bz. 2.5 By Lemma 1.1,weobtain p z z / 1 μ 1 At t / 1 μ 1 dt, 1 Bt 2.6 or equivalently, zq α,βf z 1 Auω z u / 1 μ 1 du, 1 Buω z 2.7 where ω is analytic in U with ω, ω z < 1 z U. 2.8
6 6 Journal of Inequalities and Applications Since μ<1and 1 B<A 1, we deduce from 2.7 that R zq α,β f z > 1 Au u / 1 μ 1 du. 1 Bu 2.9 By noting that R ϱ 1/n R ϱ 1/n ϱ C, R ϱ ; n 1, 2.1 the assertion 2.2 of Theorem 2.1 follows immediately from 2.9 and 2.1. To show the sharpness of 2.2, we consider the function f Σ defined by zq α,βf z 1 Auz u / 1 μ 1 du. 1 Buz 2.11 For the function f defined by 2.11, we easily find that it follows from 2.12 that [ 1 ] 1 α,β f z μq α,β f z 1 Az 1 Bz 2.12 zq α,βf z This evidently completes the proof of Theorem Au u / 1 μ 1 du z Bu In view of 1.19, by similarly applying the method of proof of Theorem 2.1,wegetthe following result. Corollary 2.2. Let μ<1 and 1 B<A 1. Iff Σ satisfies the condition [ 1 ] α,β f z μq α 1,β f z 1 Az 1 Bz /n R zq α 1,β f z > β α 1/n 1 Au u du β α / 1 μ 1 n Bu The result is sharp. For the function f Σ given by 1.1, we here recall the integral operator J υ : Σ Σ, 2.16
7 Journal of Inequalities and Applications 7 defined by J υ f z : υ 1 z υ t υ 1 f t dt υ > Theorem 2.3. Let μ<1, υ>1 and 1 B<A 1. Suppose also that J υ is given by If f Σ satisfies the condition [ 1 ] α,β f z μq α,β J 1 Az υf z 1 Bz /n υ 1 R zq α,β J υf z > 1/n 1 Au u du υ 1 / 1 μ 1 n Bu The result is sharp. Proof. We easily find from 2.17 that z. υ 1 Q α,β f z υq α,β J υf z z Q α,β υf J 2.2 Suppose that q z : zq α,β J υf z z U; f Σ It follows from 2.18, 2.2 and 2.21 that [ 1 ] α,β f z μq α,β J υf z q z 1 Az υ 1 zq z 1 Bz The remainder of the proof of Theorem 2.3 is much akin to that of Theorem 2.1, we therefore choose to omit the analogous details involved. Theorem 2.4. Let μ<1 and 1 B j <A j 1 j 1, 2. Iff Σ is defined by Q α,β f z Q α,β f1 f 2 z, 2.23 and each of the functions f j Σ j 1, 2 satisfies the condition [ 1 ] 1 α,β f j z μq α,β f j z 1 A jz 1 B j z 2.24
8 8 Journal of Inequalities and Applications [ 1 ] R 1 α,β f z μq α,β f z > 1 4 A 1 B 1 A 2 B 2 1 u / 1 μ 1 1 B 1 1 B 2 1 u du The result is sharp when B 1 B 2 1. Proof. Suppose that f j Σ j 1, 2 satisfy conditions By setting [ 1 ψ j z : 1 α,β f j z μq α,β j z ] f z U; j 1, 2, 2.26 it follows from 2.24 and 2.26 that ψ j P γ j γ j 1 A j ; j 1, B j Combining 1.18 and 2.26, weget Q α,β f j z z / 1 μ t / 1 μ 1 ψ j t dt j 1, For the function f Σ given by 2.23,wefindfrom 2.28 that Q α,β f z Q α,β f1 f 2 z z / 1 μ z / 1 μ t / 1 μ 1 ψ 1 t dt z / 1 μ t / 1 μ 1 ψ t dt, t / 1 μ 1 ψ 2 t dt 2.29 where ψ z z / 1 μ t / 1 μ 1 ψ 1 ψ 2 t dt. 2.3 By noting that ψ 1 P γ 1 and ψ 2 P γ 2, it follows from Lemma 1.2 that ψ1 ψ 2 z P γ3 γ γ 1 1 γ
9 Journal of Inequalities and Applications 9 Furthermore, by Lemma 1.3, we know that R ψ 1 ψ 2 z > 2γ γ 3 1 z In view of 2.24, 2.3, and 2.32, we deduce that [ 1 ] R 1 α,β f z μq α,β f z R ψ z u / 1 μ 1 R ψ 1 ψ 2 uz du u / 1 μ 1 2γ γ 3 du 1 u z 1 4 A 1 B 1 A 2 B 2 1 B 1 1 B 2 1 u / 1 μ 1 1 u du When B 1 B 2 1, we consider the functions f j Σ j 1, 2 which satisfy conditions 2.24 and are given by Q α,β f j z z / 1 μ 1 Aj t / 1 μ 1 t dt 1 t j 1, It follows from 2.26, 2.28, 2.3, and 2.34 that ψ z [ u / 1 μ A 1 1 A 2 1 A ] 1 1 A 2 du. 1 uz 2.35 Thus, we have ψ z 1 1 A 1 1 A 2 1 u / 1 μ 1 1 u du z The proof of Theorem 2.4 is evidently completed. With the aid of 1.19, by applying the similar method of the proof of Theorem 2.4,we obtain the following result. Corollary 2.5. Let μ<1 and 1 B j <A j 1 j 1, 2. Iff Σ is defined by 2.23 and each of the functions f j Σ j 1, 2 satisfies the condition [ 1 ] α,β f j z μq α 1,β f j z 1 A jz 1 B j z 2.37
10 1 Journal of Inequalities and Applications [ 1 μ ] R z Q α,β f z μq α 1,β f z >1 4 A 1 B 1 A 2 B 2 1 β α 1 B 1 1 B 2 1 μ u β α / 1 μ 1 1 u du The result is sharp when B 1 B 2 1. Acknowledgments This work was supported by the National Natural Science Foundation under Grant , the Science Research Fund of Guangdong Provincial Education Department under Grant LYM811, the Natural Science Foundation of Guangdong Province under Grant , and the Excellent Youth Foundation of Educational Committee of Hunan Province under Grant 1B2 of the People s Republic of China. References 1 I. B. Jung, Y. C. Kim, and H. M. Srivastava, The Hardy space of analytic functions associated with certain one-parameter families of integral operators, Journal of Mathematical Analysis and Applications, vol. 176, no. 1, pp , A. Y. Lashin, On certain subclasses of meromorphic functions associated with certain integral operators, Computers & Mathematics with Applications, vol. 59, no. 1, pp , Z.-G. Wang, Z.-H. Liu, and Y. Sun, Some subclasses of meromorphic functions associated with a family of integral operators, Journal of Inequalities and Applications, vol. 29, Article ID 93123, 18 pages, Y. Sun, W.-P. Kuang, and Z.-H. Liu, Subordination and superordination results for the family of Jung- Kim- Srivastava integral operators, Filomat, vol. 24, pp , S. S. Miller and P. T. Mocanu, Differential subordinations and univalent functions, The Michigan Mathematical Journal, vol. 28, no. 2, pp , J. Stankiewicz and Z. Stankiewicz, Some applications of the Hadamard convolution in the theory of functions, Annales Universitatis Mariae Curie-Skłodowska Sectio A, vol. 4, pp , H. M. Srivastava and S. Owa, Eds., Current Topics in Analytic Function Theory, World Scientific, River Edge, NJ, USA, 1992.
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