- About this Journal ·
- Abstracting and Indexing ·
- Advance Access ·
- Aims and Scope ·
- Article Processing Charges ·
- Articles in Press ·
- Author Guidelines ·
- Bibliographic Information ·
- Citations to this Journal ·
- Contact Information ·
- Editorial Board ·
- Editorial Workflow ·
- Free eTOC Alerts ·
- Publication Ethics ·
- Reviewers Acknowledgment ·
- Submit a Manuscript ·
- Subscription Information ·
- Table of Contents

Journal of Mathematics

Volume 2013 (2013), Article ID 841837, 8 pages

http://dx.doi.org/10.1155/2013/841837

## Convexity and Spirallikeness Conditions for Two New General Integral Operators

^{1}Department of Mathematics, Faculty of Science, Dicle University, 21280 Diyarbakir, Turkey^{2}Civil Aviation College, Kocaeli University, Arslanbey Campus, 41285 Kocaeli, Turkey

Received 3 January 2013; Accepted 11 April 2013

Academic Editor: Majid Soleimani-damaneh

Copyright © 2013 H. Özlem Güney and Serap Bulut. 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.

#### Abstract

We define two new general integral operators for certain analytic functions in the unit disc and give some sufficient conditions for these integral operators on some subclasses of analytic functions.

#### 1. Introduction

Let denote the class of all functions of the form which is analytic in the open unit disc .

In particular, we set

The fractional derivative of order is defined, for a function , by where the function is analytic in a simply connected region of the complex -plane containing the origin, and the multiplicity of is removed by requiring to be real when .

It readily follows from (3) that

Using the operator ,

Bulut [1] defined the general differential operator , namely, the generalization of the generalized Al-Oboudi differential operator as follows:

If is given by (1), then by (5) and (6), we see that where

By using the operator defined by (7), we introduce the new classes and as follows.

*Definition 1. *A function is in the class if and only if satisfies
where , , , and is defined by (7).

*Definition 2. *A function is in the class if and only if satisfies
where , , , , and is defined by (7).

Note that

*Remark 3. *(i) For , we have the classes
introduced and studied by Bulut [1]. In particular, we get the classes
introduced and studied by Bulut [2].(ii) For and , we have the classes
In particular, we set
for the -valently starlike and -valently convex functions with complex order , respectively.(iii) For , we have the classes
In particular, we set
Also, we have the classes
introduced and studied by Shams et al. [3].(iv) For and , we have the classes
of -valently starlike and -valently convex functions with complex order and type , respectively. In particular, we set
Note that for , we have
which are the classes of starlike and convex functions type , respectively.(v) For , , , and , we have the classes
of uniformly starlike and uniformly convex functions of order , respectively, investigated by Rønning [4]. In particular, we get the classes
of uniformly starlike and uniformly convex functions, respectively, first defined by Goodman [5].

*Remark 4. *If we set and in Definitions 1 and 2, then we have the classes
respectively. Also, we put
In particular, we set
for the the class of -spirallike functions of order [6], and the class of -Robertson functions of order [7], respectively.

We now define the following general integral operators.

*Definition 5. *Let , , and . One defines the following general integral operators:
where , , and is defined by (7) for .

*Remark 6. *(i) For , , , and , we have the integral operators
(ii) For , , and , we have the integral operators
introduced by Saltık et al. [8].(iii) For , we have the integral operators
introduced by Frasin [9].

#### 2. Sufficient Conditions for the Operator

Theorem 7. *Let , , and . Also let , , , and for . If
**
then the integral operator , defined by (29), is in the class , where
*

*Proof. *From the definition (29), we observe that . On the other hand, it is easy to see that
Differentiating (38) logarithmically and multiplying by , we obtain
or equivalently
Then, by multiplying (40) with , we have
or equivalently
Since , we get
Since
the integral operator with

Corollary 8. *In Theorem 7, letting*(i)*, , and , one obtains [10, Theorem 1].*(ii)*, , and , , one obtains [11, Theorem 1].*(iii)*, , and , , one obtains [12, Theorem 1]. *

Putting , , , , , and in Theorem 7, we have the following.

Corollary 9. *Let and . Also let , , , and . If
**
then the integral operator , defined by (32), is in the class , where
*

Putting and in Corollary 9, we have the following.

Corollary 10. *Let , , , , and . If
**
then the integral operator
**
is convex of complex order and type ; that is, .*

Putting , , and in Theorem 7, we have the following.

Corollary 11. *Let , , , , and for . If
**
then the integral operator
**
is in the class , where
*

Theorem 12. *Let , , and . Also let , , and for . If
**
then the integral operator , defined by (29), is in the class , where
*

*Proof. *From (24), (25), and (40), we get the desired result.

Putting , , , and in Theorem 12, we have the following.

Corollary 13. *Let and . Also let , , and . If
**
then the integral operator , defined by (32), is in the class , where
*

Putting and in Corollary 13, we have the following.

Corollary 14. *Let , , , and . If
**
then the integral operator , defined by (49), is in the class , where
*

Putting and in Theorem 12, we have the following.

Corollary 15. *Let , , , and for . If
**
then the integral operator , defined by (51), is in the class , where
*

Theorem 16. *Let , , and . Also let , , and for . If
**
for all , then the integral operator , defined by (29), is -valently convex of complex order ; that is, .*

*Proof. *From (43) and (61), we easily get that the integral operator is -valently convex of complex order .

#### 3. Sufficient Conditions for the Operator

Theorem 17. *Let , , and . Also let , , , and for . If
**
then the integral operator , defined by (31), is in the class , where
*

*Proof. *From the definition (31), we observe that . On the other hand, it is easy to see that
Differentiating (64) logarithmically and multiplying by , we obtain
or equivalently
Then, by multiplying (66) with , we have
or equivalently
Since , we get
Since
the integral operator with

Corollary 18. *In Theorem 17, letting*(i)*, , and , one obtains [10, Theorem 3].*(ii)*, , and , , one obtains [11, Theorem 3].*(iii)*, , and , , one obtains [12, Theorem 2]. *

Putting , , , , , and in Theorem 17, we have the following.

Corollary 19. *Let and . Also let , , and . If
**
then the integral operator , defined by (33), is in the class , where
*

Putting and in Corollary 19, we have the following.

Corollary 20. *Let , , , , and . If
**
then the integral operator
**
is convex of complex order and type ; that is, .*

Putting , , and in Theorem 17, we have the following.

Corollary 21. *Let , , , , and for . If
**
then the integral operator
**
is in the class , where
*

Theorem 22. *Let , , and . Also let , , and for . If
**
then the integral operator , defined by (31), is in the class , where
*

*Proof. *From (25) and (66), we get the desired result.

Putting , , , , and in Theorem 22, we have the following.

Corollary 23. *Let and . Also let , , and . If
**
then the integral operator , defined by (33), is in the class , where
*

Putting and in Corollary 23, we have the following.

Corollary 24. *Let , , , and . If
**
then the integral operator , defined by (75), is in the class , where
*

Putting and in Theorem 22, we have the following.

Corollary 25. *Let , , , and for . If
**
then the integral operator , defined by (77), is in the class , where
*

Theorem 26. *Let , , and . Also let , , and for . If
**
for all , then the integral operator , defined by (31), is -valently convex of complex order ; that is, .*

*Proof. *From (69) and (87), we easily get that the integral operator is -valently convex of complex order .

#### References

- S. Bulut, “The generalization of the generalized Al-Oboudi differential operator,”
*Applied Mathematics and Computation*, vol. 215, no. 4, pp. 1448–1455, 2009. View at Publisher · View at Google Scholar · View at Zentralblatt MATH · View at MathSciNet - S. Bulut, “Coefficient inequalities for certain subclasses of analytic functions defined by using a general derivative operator,”
*Kyungpook Mathematical Journal*, vol. 51, no. 3, pp. 241–250, 2011. View at Publisher · View at Google Scholar · View at Zentralblatt MATH · View at MathSciNet - S. Shams, S. R. Kulkarni, and J. M. Jahangiri, “Classes of uniformly starlike and convex functions,”
*International Journal of Mathematics and Mathematical Sciences*, vol. 55, no. 53–56, pp. 2959–2961, 2004. View at Publisher · View at Google Scholar · View at Zentralblatt MATH · View at MathSciNet - F. Rønning, “On starlike functions associated with parabolic regions,”
*Annales Universitatis Mariae Curie-Skłodowska. A. Mathematica*, vol. 45, pp. 117–122, 1991. View at MathSciNet - A. W. Goodman, “On uniformly convex functions,”
*Annales Polonici Mathematici*, vol. 56, no. 1, pp. 87–92, 1991. View at Zentralblatt MATH · View at MathSciNet - R. J. Libera, “Univalent $\alpha $-spiral functions,”
*Canadian Journal of Mathematics*, vol. 19, pp. 449–456, 1967. View at MathSciNet - P. N. Chichra, “Regular functions $f(z)$ for which $z{f}^{\text{'}}(z)$ is $\alpha $-spiral-like,”
*Proceedings of the American Mathematical Society*, vol. 49, pp. 151–160, 1975. View at MathSciNet - G. Saltık, E. Deniz, and E. Kadıoğlu, “Two new general $p$-valent integral operators,”
*Mathematical and Computer Modelling*, vol. 52, no. 9-10, pp. 1605–1609, 2010. View at Publisher · View at Google Scholar · View at MathSciNet - B. A. Frasin, “New general integral operators of $p$-valent functions,”
*Journal of Inequalities in Pure and Applied Mathematics*, vol. 10, no. 4, article 109, p. 9, 2009. View at MathSciNet - S. Bulut, “A note on the paper of Breaz and Güney,”
*Journal of Mathematical Inequalities*, vol. 2, no. 4, pp. 549–553, 2008. View at Publisher · View at Google Scholar · View at MathSciNet - D. Breaz and H. Ö. Güney, “The integral operator on the classes ${\mathcal{S}}_{\alpha}^{\ast}(b)$ and ${C}_{\alpha}(b)$,”
*Journal of Mathematical Inequalities*, vol. 2, no. 1, pp. 97–100, 2008. View at Publisher · View at Google Scholar · View at MathSciNet - D. Breaz, M. K. Aouf, and N. Breaz, “Some properties for integral operators on some analytic functions with complex order,”
*Acta Mathematica. Academiae Paedagogicae Nyíregyháziensis. New Series*, vol. 25, no. 1, pp. 39–43, 2009. View at Zentralblatt MATH · View at MathSciNet