Abstract
This article aims to significantly advance geometric function theory by providing a valuable contribution to analytic and multivalent functions. It focuses on differential subordination and superordination, which characterize the interactions between analytic functions. To achieve our goal, we employ a method that relies on the characteristics of differential subordination and superordination. As one of the latest advancements in this field, this technique is able to derive several results about differential subordination and superordination for multivalent functions defined by the new operator within the open unit disk . Additionally, by employing the technique, the differential sandwich outcome is achieved. Therefore, this work presents crucial exceptional instances that follow the results. The findings of this paper can be applied to a wide range of mathematical and engineering problems, including system identification, orthogonal polynomials, fluid dynamics, signal processing, antenna technology, and approximation theory. Furthermore, this work significantly advances the knowledge and understanding of the analytical functions of the unit and its interactive higher relations. The characteristics and consequences of differential subordination theory are symmetric to those of differential superordination theory. By combining them, sandwich-type theorems can be derived.
1. Introduction and Definitions
Geometric function theory is a branch of complex analysis concerned with, and investigating, the geometric characteristics of analytic functions. The study of the theory of analytic univalent and multivalent functions is a cornerstone of complex analysis, captivating researchers due to its elegant geometric and abundant research prospects.
The study of univalent functions constitutes a fundamental pillar of complex analysis for both single and many variables. This concept traces its roots to the novel works of Koebe in 1907 [1], Gronwall in 1914, and Bieberbach in 1916. Their contributions, including Koebe’s fundamental publication, Gronwall’s area theorem, and Bieberbach’s second coefficient estimate, have been considered the groundwork for the subsequent development in this field [2]. Univalent function theory had become a distinct discipline at that point. Sanford S. Miller and Petru T. Mocanu proposed the notion of differential subordinations. Miller and Mocanu first introduced the concept of differential subordination in their book published in 2000 [3]. Also, in 2003, they developed the concept of differential superordination as a complementary concept [4].
In 2009, the idea of strong differential superordination was introduced, expanding on the twin notions of differential subordination and differential superordination [4]. Additionally, the authors in [5] provided initial instances of strong differential subordinations and superordinations for analytic functions. Numerous scholars have explored second-order differential superordination and subordination [6,7]. To investigate the characteristics of subordination and superordination, Ibrahim et al. [8,9], in 2015, introduced a novel operator by employing a convolution technique between the Carlson–Shaffer operator and a fractional integral operator. In 2021, Lupas and Oros [10] examined the concept of subordination and its characteristics by utilizing the fractional integral of the confluent Hypergeometric function. The subsequent year witnessed the publication of many papers investigating the features of subordination and subordination (such as [11,12]). Renowned mathematicians, such as Zayed and Bulboacă [13], Attiy et al. [14], Oros and Oros [15], Reem and Kassim [16], Abdulnabi et al. [17], and others have recently carried out considerable advanced investigations based on subordinate techniques (see further details in [9,18,19,20,21,22,23,24,25]).
The family denotes the class of all analytic functions in the open unit disk
and is the subclass of which consists of the form functions
Let be the class of all multivalent in open unit disk functions of the form
Furthermore, we denote by the class of analytic functions in and normalized with , . Also, consider to be the class of univalent function in . Let and be the subclasses of such that
If
Then is starlike function of order .
If
Then is convex function of order .
If
Then is close-to-convex function of order .
Particularly in complex analysis and geometric function theory, symmetry refers to a function’s property of remaining invariant when its variables are substituted with an equal or balanced number [2]. In complex functions, symmetry is when is a complex function, it may be said to be symmetric if and only if ), . Stated otherwise, the function’s values at and are identical. The function is symmetric around the origin in the complex plane because of this characteristic.
Conversely, the symmetry derivatives for the function may be altered by this feature when and are symmetric. While may not change, it is common to see that changes in sign.
Here, we review the subordination principles between the two analytic functions in ,(), and (). If there is an analytic function ) in , with and , , such that () = (()), then is subordinate to written , . Furthermore, if is univalent in , then is equivalent to and () ⸦ ).
The convolution operation (also known as Hadamard product) is a famous mathematical procedure credited to Hadamard and represented by the symbol *. This concept describes an intriguing new way to develop convolution operators and special functions. The formulation is as follows:
For , where is defined by (2) and is given by
the convolution (Hadamard product) of the function and , written as , yields a new analytic function stated as [2]
For and , Goyal et al. [26] introduced the following differential operator:
In general,
Among the fundamental principles and typical applications of fractional calculus (see for examples [27,28]), the Riemann–Liouville fractional integral operator of order is a highly utilized operator. It is defined as follows:
utilizing the well-known Gamma function (Euler’s). As an intriguing substitute for the Riemann–Liouville operator , consider the Erdelyi–Kober fractional integral operator of order which is defined as follows:
where .
This corresponds roughly to (4) when since
Here, we examine [29] the integral operator , primarily inspired by the particular situation of the expression (5) when , and and .
where and
Applying the Eulerian Beta-function integral to evaluate (Euler’s) Gamma function as follows:
Ekram et al. [30] introduced the differintegral operator defined by
where and
If implies that
Definition 1.
Suppose
and we definition the new operator
where
It is readily verified from (6) that
Remark 1.
Special cases of operator are indicated below.
- 1.
- When the operator reduce to that introduced by Al-Oboudi [31].
- 2.
- When the operator reduce to that introduced by Salagean operator [32].
- 3.
- When the operator reduce to that introduced by Ekram et al. [30].
- 4.
- When the operator reduce to that introduced by Goyal et al. [26].
- 5.
- When , the operator reduce to that introduced by Ŕand and Sharma [33].
- 6.
- When and , the operator reduce to that introduced by Saitoh et al. [34].
- 7.
- When and , the operator reduce to that introduced by Aouf et al. [35].
- 8.
- When and , the operator reduce to that introduced by Liu and Owa [36].
- 9.
- When and , the operator reduce to that introduced by Jung et al. [37].
- 10.
- When and , the operator reduce to that introduced by Carlson and Shaffer [38].
- 11.
- When and , the operator reduce to that introduced by Choi et al. [39].
- 12.
- When and , the operator reduce to that introduced by Ruscheweyh [40].
- 13.
- When and , the operator reduce to that introduced by Noor [41].
- 14.
- When and , the operator reduce to that introduced by Bernadi [42].
- 15.
- When and , the operator reduce to that introduced by Libera [43].
Definition 2.
[44] Let :, and ( be univalent in
. If () is analytic in that fulfill the second-order differential subordination
then is a solution of differential subordination in (8).
Definition 3.
[44] Let ( be univalent in
and
:. If () and are univalent in
and that fulfill the second-order differential superordination
then is a solution of differential superordination in (9).
Definition 4.
[44] Let be the families of functions
which are injective and analytic on, when , and for
Lemma 1.
[4] Let and be holomorphic in a domain
and let be univalent function in
,
(
with when (). Set
and . Assume that
is starlike in .
, . If
is holomorphic in
with
,( and
then
Lemma 2
[44] Let be convex in
and with If is holomorphic in
and
then
Lemma 3.
[4] Let be convex univalent in
and let and let
and be holomorphic in a domain
, ( Suppose that
is starlike univalent in
,
If , with(, is univalent in and
then
Lemma 4.
[4] Let be convex in
and If ,
is univalent in
and
then .
The new operator, which is symmetric in the unit disk , is used in this article. We use the results of multivalent functions applying operator to derive many differential subordinations and superordinations. Following that, a few sandwich-type outcomes are also provided.
2. Subordination Results
In this section, we use the differential subordination process to study several convexity criteria of the new operator.
Theorem 1.
Let be convex univalent in
, with , and suppose the symmetry condition
for all Assume the function
satisfies the condition
where
and
If
, satisfies the subordination
then
Proof.
then
Consider
We have
By using (5), we get
And
By using the hypothesis, and apply Lemma 2, when and , then
By using the symmetry condition for all , and the subordination principle, we get
Thus
□
Corollary 1.
Let be convex univalent in
, with , and suppose the symmetry condition
for all Assume the function
satisfies the condition
where
and
If
, satisfies the subordination
then
Theorem 2.
Let be convex univalent in
, with , and suppose the symmetry condition
for all Assume the function
satisfies the condition
where and
If , satisfies the subordination
then
Proof.
Consider
then
Thus,
Applying the hypothesis, we get
Hence,
By using the condition of subordination, we obtain
Now, applying the convexity condition, we get
By using the symmetry condition for all , and the subordination principle, and applying Lemma 2, when and , we conclude that,
then
□
Corollary 2.
Let be convex univalent in , with , and suppose
If , satisfies the subordination
Then the special case in the following are holds.
Example 1.
If we choose and , then the condition clarify to
In a special case, we use the above conditions to get
Proof.
Consider the transformed of this function becomes
Now we will compare this simplified form:
Putting
We derive both sides with respect to we get
Therefore,
To put it simply,
Thus,
Hence,
□
Theorem 3.
Let be convex univalent in
, and for each and assume that satisfies
where and
Suppose that is starlike univalent in
If , satisfies the subordination
where
then
Proof.
Let and , when and are analytic in . Then, we get
and
Since starlike. Then is starlike in and
Also, consider
then
we get
Since
that
From (10) we get
by Lemma 1, we obtain □
Corollary 3.
Let be convex univalent in , and for each and assume that satisfies
where and
Suppose that is starlike univalent in If , satisfies the subordination
then
Theorem 4.
Let be convex univalent in , and for each and assume that satisfies
where and
Suppose that is starlike univalent in If , satisfies the subordination
where
then
Proof.
Let and , when and are analytic in . Then, we get
and
Since is starlike. Then is starlike in and
Also, we defined
Now, taking the derivative of the function getting
Thus, we get
Since
that
From (12) we get
by Lemma 1, we obtain
□
3. Superordinations Results
In this section, we use the differential superordination process to study several convexity criteria of the new operator.
Theorem 5.
Let be convex in , with , , If ,
and let
be univalent in and satisfies the superordination.
then
Proof.
Consider
then
We have
with the same steps of Theorem 1, and using the hypothesis, we get
Applying Lemma 4, we get
□
Corollary 4.
Let be convex in , with , ,
If ,
and let
be univalent in and satisfies the superordination.
then
Theorem 6.
Let be convex univalent in , with , . If , satisfies the superordination
and
be univalent in and satisfies the superordination
then
Proof.
We defined the function as the following:
we derive the above function, we get
Thus,
with the same steps of Theorem 2 and using the hypothesis, we get
applying Lemma 4, when and , we conclude that,
then
□
Corollary 5.
Let be convex univalent in , with , and suppose
If , satisfies the superordination
Then the special case in the following are holds.
Example 2.
If we choose and , then the condition clarify to
In a special case, we use the above conditions to get
Proof.
Consider the transformed of this function becomes
Now we will compare this simplified form:
with the same steps of Corollary 2 and using the hypothesis, we get
□
Theorem 7.
Let be convex univalent in
, and for each and assume that satisfies
where , and is starlike univalent in
If , satisfies the condition
and
is univalent in
If then
Proof.
Let and , when is analytic in and is analytic in . Then we get
Since starlike, then is starlike in and
Now let
From (10) we get
By Lemma 3 we get □
Corollary 6.
Let be convex univalent in , and for each and assume that satisfies
where , and is starlike univalent in
If , satisfies the condition
and
is univalent in .
If then
Theorem 8.
Let be convex univalent in
, and for each and assume that satisfies
where and
Suppose that is starlike univalent in If , satisfies the condition
and is univalent in If
then
Proof.
Let and , when and are analytic in . Then, we get
and
Since is starlike. Then is starlike in and
Also, we defined
From (14) we get
by Lemma 3, we obtain
□
4. Sandwich Results
The two sandwich theorems that follow are obtained by merging the aforementioned ideas.
Theorem 9.
Let be convex univalent in , with , and
where . If
and
and
is univalent in satisfies
then
Theorem 10.
Let be convex univalent in , with , and let , satisfies the condition:
and
is univalent in
If
then
5. Conclusions
In this article, we applied higher-order derivatives we uncovered (derived) in significant relationships between differential subordination and superordination for the new operator of multivalent functions that are analytic in . Following the theoretical analysis, particular cases have been evaluated to demonstrate the outcomes of differential subordination. A sandwich-type approach was utilized to achieve differential outcomes. The novel results have the potential to assist mathematicians in exploring further specific outcomes in the geometric function theory domain. Accordingly, our results represent a significant contribution to this field. Furthermore, investigating the symmetry properties of the functions could lead to deriving solutions with certain characteristics for an equation or inequality. By examining inequalities in the context of differential subordination and superordination, exploring the symmetry features of new operator might provide intriguing outcomes. As a part of our future work, we will further investigate the symmetry properties of various functions within the framework of differential subordination and superordination. This investigation could include different types of holomorphic functions, such as harmonic and meromorphic functions, and extend their application to fuzzy differential subordination and superordination.
Author Contributions
The idea was proposed by N.H.S. and improved by N.H.S., A.R.S.J., D.B., L.-I.C., M.D. and A.D. The author, N.H.S., wrote and completed all the calculations. The authors, A.R.S.J., D.B., L.-I.C., M.D. and A.D., checked all the results. All authors have read and agreed to the published version of the manuscript.
Funding
This research received no external funding.
Data Availability Statement
Data is contained within the article.
Conflicts of Interest
The authors declare no conflicts of interest.
References
- Koebe, P. Über die Uniformisierung beliebiger analytischer Kurven. Nachrichten Von Der Ges. Der Wiss. Zu Göttingen Math.-Phys. Kl. 1907, 1907, 191–210. [Google Scholar]
- Duren, P. Univalent Functions. In Grundlehren der Mathematischen Wissenschaften, 259; Springer: New York, NY, USA, 1983. [Google Scholar]
- Miller, S.S.; Mocanu, P.T. Differential Subordinations: Theory and Applications; CRC Press: Boca Raton, FL, USA, 2000. [Google Scholar]
- Miller, S.S.; Mocanu, P.T. Subordinants of differential superordinations. Complex Var. 2003, 48, 815–826. [Google Scholar] [CrossRef]
- Jeyaraman, M.; Suresh, T. Strong differential subordination and superordination of analytic functions. J. Math. Anal. Appl. 2012, 385, 854–864. [Google Scholar] [CrossRef][Green Version]
- Ali, R.M.; Ravichandran, V.; Seenivasagan, N. Differential subordination and superordination of analytic functions defined by the multiplier transformation. Math. Inequal. Appl. 2009, 12, 123–139. [Google Scholar] [CrossRef]
- AL-Ameedee, S.A.; Atshan, W.G.; Ali AL-Maamori, F. On sandwich results of univalent functions defined by a linear operator. J. Interdiscip. Math. 2020, 23, 803–809. [Google Scholar] [CrossRef]
- Ibrahim, R.W.; Ahmad, M.Z.; Al-Janaby, H.F. Third-order differential subordination and superordination involving a fractional operator. Open Math. 2015, 13, 000010151520150068. [Google Scholar] [CrossRef]
- Ali, E.E.; Srivastava, H.M.; El-Ashwah, R.M.; Albalahi, A.M. Differential subordination and differential superordination for classes of admissible multivalent functions associated with a linear operator. Mathematics 2022, 10, 4690. [Google Scholar] [CrossRef]
- Lupaş, A.A.; Oros, G.I. Differential subordination and superordination results using fractional integral of confluent hypergeometric function. Symmetry 2021, 13, 327. [Google Scholar] [CrossRef]
- Mahmood, Z.H.; Jassim, K.A.; Shihab, B.N. Differential Subordination and Superordination for Multivalent Functions Associated with Generalized Fox-Wright Functions. Iraqi J. Sci. 2022, 63, 675–682. [Google Scholar] [CrossRef]
- Hadi, S.H.; Darus, M. Differential subordination and superordination of a q-derivative operator connected with the q-exponential function. Int. J. Nonlinear Anal. Appl. 2022, 13, 2795–2806. [Google Scholar]
- Zayed, H.; Bulboacă, T. Sandwich results for higher order fractional derivative operators. Mat. Stud. 2018, 49, 52–66. [Google Scholar] [CrossRef]
- Attiya, A.A.; Aouf, M.K.; Ali, E.E.; Yassen, M.F. Differential subordination and superordination results associated with Mittag–Leffler function. Mathematics 2021, 9, 226. [Google Scholar] [CrossRef]
- Oros, G.I. Strong differential superordination. Acta Univ. Apulensis. Math.-Inform. 2009, 19, 101–106. [Google Scholar]
- Rasheed, R.O.; Jassim, K.A. A Study of a Certain Family of Multivalent Functions Associated with Subordination. Iraqi J. Sci. 2021, 62, 3009–3019. [Google Scholar] [CrossRef]
- Abdulnabi, F.F.; Al-Janaby, H.F.; Ghanim, F.; Alb Lupaș, A. Some Results on Third-Order Differential Subordination and Differential Superordination for Analytic Functions Using a Fractional Differential Operator. Mathematics 2023, 11, 4021. [Google Scholar] [CrossRef]
- Duren, P.L. Univalent Functions; Springer Science & Business Media: Berlin/Heidelberg, Germany, 2001; Volume 259. [Google Scholar]
- El-Ashwah, R.M.; Kota, W.Y.; Bulboaca, T. Inclusion and subordination properties for classes of multivalent functions involving differ-integral operator. Inf. Sci. Lett. 2022, 11, 47–60. [Google Scholar]
- Miller, S.S.; Mocanu, P.T. Briot–Bouquet differential superordinations and sandwich theorems. J. Math. Anal. Appl. 2007, 329, 327–335. [Google Scholar] [CrossRef][Green Version]
- Zayed, H.M.; Kamal Aouf, M.; Mostafa, A.O. Subordination properties for multivalent functions associated with a generalized fractional differintegral operator. Axioms 2018, 7, 27. [Google Scholar] [CrossRef]
- Shehab, N.H.; Juma, A.R.S. Quasi subordination of bi-univalent functions involving convolution operator. In Proceedings of the AIP Conference Proceedings, 7th International Symposium on Current Progress in Mathematics and Sciences 2021, Depok, Indonesia, 6–7 October 2021; p. 060062. [Google Scholar]
- Shehab, N.H.; Juma, A.R.S. Application of Quasi Subordination Associated with Generalized Sakaguchi Type Functions. Iraqi J. Sci. 2021, 62, 4885–4891. [Google Scholar] [CrossRef]
- Cotîrlă, L.-I.; Juma, A.R.S. Properties of differential subordination and superordination for multivalent functions associated with the convolution operators. Axioms 2023, 12, 169. [Google Scholar] [CrossRef]
- Lupaş, A.A.; Ghanim, F. Strong differential subordination and superordination results for extended q-analogue of multiplier transformation. Symmetry 2023, 15, 713. [Google Scholar] [CrossRef]
- Goyal, S.; Singh, O.; Goswami, P. Some relations between certain classes of analytic multivalent functions involving generalized salagean operator. Sohag J. Math. 2014, 1, 27–32. [Google Scholar]
- Kiryakova, V.S. Generalized Fractional Calculus and Applications; CRC Press: Boca Raton, FL, USA, 1993. [Google Scholar]
- Kilbas, A.A.; Srivastava, H.M.; Trujillo, J.J. Theory and Applications of Fractional Differential Equations; Elsevier: Amsterdam, The Netherlands, 2006; Volume 204. [Google Scholar]
- El-Ashwah, R.; Drbuk, M. Subordination properties of p-valent functions defined by linear operators. Br. J. Math. Comput. Sci. 2014, 4, 3000. [Google Scholar] [CrossRef]
- Ali, E.E.; El-Ashwah, R.M.; Sidaoui, R. Application of subordination and superordination for multivalent analytic functions associated with differintegral operator. AIMS Math. 2023, 8, 11440–11459. [Google Scholar] [CrossRef]
- Al-Oboudi, F.M. On univalent functions defined by a generalized Slgean operator. Int. J. Math. Math. Sci. 2004, 2004, 1429–1436. [Google Scholar] [CrossRef]
- Salagean, G.S. Subclasses of univalent functions. In Proceedings of the Complex Analysis—Fifth Romanian-Finnish Seminar: Part 1 Proceedings of the Seminar, Bucharest, Romania, 28 June–3 July 1981; pp. 362–372. [Google Scholar]
- Sharma, P.; Raina, R.K. Subordination preserving properties associated with a class of operators. Le Mat. 2013, 68, 217–228. [Google Scholar]
- Saitoh, H.; Owa, S.; Sekine, T.; Nunokawa, M.; Yamakawa, R. An application of certain integral operator. Appl. Math. Lett. 1992, 5, 21–24. [Google Scholar] [CrossRef]
- Aouf, M.; El-Ashwah, R.; Abd-Eltawab, A.M. Some Inclusion Relationships of Certain Subclasses of p-Valent Functions Associated with a Family of Integral Operators. Int. Sch. Res. Not. 2013, 2013, 384170. [Google Scholar] [CrossRef]
- Liu, J.-L.; Owa, S. PROPERTIES OF CERTAIN INTEGRAL OPERATOR (Study on Differential Operators and Integral Operators in Univalent Function Theory). Res. Inst. Math. Sci. Kokyuroku 2003, 1341, 45–51. [Google Scholar]
- Jung, I.B.; Kim, Y.C.; Srivastava, H. The Hardy space of analytic functions associated with certain one-parameter families of integral operators. J. Math. Anal. Appl. 1993, 176, 138–147. [Google Scholar] [CrossRef]
- Carlson, B.; Shaffer, D.B. Starlike and prestarlike hypergeometric functions. SIAM J. Math. Anal. 1984, 15, 737–745. [Google Scholar] [CrossRef]
- Choi, J.H.; Saigo, M.; Srivastava, H. Some inclusion properties of a certain family of integral operators. J. Math. Anal. Appl. 2002, 276, 432–445. [Google Scholar] [CrossRef]
- Ruscheweyh, S. New criteria for univalent functions. Proc. Am. Math. Soc. 1975, 49, 109–115. [Google Scholar] [CrossRef]
- Noor, K.I. On new classes of integral operators. J. Nat. Geom. 1999, 16, 71–80. [Google Scholar]
- Bernardi, S. Convex and starlike univalent functions. Trans. Am. Math. Soc. 1969, 135, 429–446. [Google Scholar] [CrossRef]
- Libera, R. Some classes of regular univalent functions. Proc. Am. Math. Soc. 1965, 16, 755–758. [Google Scholar] [CrossRef]
- Shanmugam, T.; Sivasubramanian, S.; Srivastava, H. Differential sandwich theorems for certain subclasses of analytic functions involving multiplier transformations. Integral Transform. Spec. Funct. 2006, 17, 889–899. [Google Scholar] [CrossRef]
Disclaimer/Publisher’s Note: The statements, opinions and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s). MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions or products referred to in the content. |
© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).