Some New Fractional Estimates of Inequalities for LR-p -Convex Interval-Valued Functions by Means of Pseudo Order Relation

: It is a familiar fact that interval analysis provides tools to deal with data uncertainty. In general, interval analysis is typically used to deal with the models whose data are composed of inac-curacies that may occur from certain kinds of measurements. In interval analysis, both the inclusion relation ( ⊆ ) and pseudo order relation (cid:0) ≤ p (cid:1) are two different concepts. In this article, by using pseudo order relation, we introduce the new class of nonconvex functions known as LR-p -convex interval-valued functions (LR-p -convex-IVFs). With the help of this relation, we establish a strong relationship between LR-p -convex-IVFs and Hermite-Hadamard type inequalities ( HH -type inequalities) via Katugampola fractional integral operator. Moreover, we have shown that our results include a wide class of new and known inequalities for LR-p -convex-IVFs and their variant forms as special cases. Useful examples that demonstrate the applicability of the theory proposed in this study are given. The concepts and techniques of this paper may be a starting point for further research in this area.


Introduction
Hermite [1] and Hadamard [2] derived the familiar inequality known as Hermite-Hadamard inequality (HH inequality).This inequality establishes a strong relationship with a convex function such that: Let f : I → R be a convex function defined on an interval I ⊆ R and u, ν ∈ I such that ν > u.Then If f is a concave function, then both inequalities are reversed.We note that HH-inequality may be regarded as a refinement of the concept of convexity and it follows easily from Jensen's inequality.In the last few decades, HH-inequality has attracted many authors to devote themselves to this field.Therefore, many authors have proposed different varieties of convexities to introduce HH-type inequalities such as harmonic convexity [3], quasi convexity [4], Schur convexity [5,6], strong convexity [7,8], h-convexity [9], p-convexity [10], fuzzy convexity [11,12], fuzzy pre-invexity [13] and generalized convexity [14], P-convexity [15], etc. Fejér [16] considered the major generalization of HH-inequality which is known as HH-Fejér inequality.It can be expressed as follows: Let f : [u, ν] → R be a convex function on an interval [u, ν] with u ≤ ν , and let W : [u, ν] ⊂ R → R with W ≥ 0 be an integrable and symmetric function with respect to u+ν 2 .Then, we have the following inequality: If f is concave, then the double inequality (2) is reversed.If W (x) = 1, then we obtain (1) from (2).With the assistance of inequality (2), several classical inequalities can be obtained through special convex functions.In addition, these inequalities have a very significant role for convex functions in both pure and applied mathematics.We urge the readers for a further analysis of the literature on the applications and properties of generalized convex functions and HH-integral inequalities, see [17][18][19] and the references therein.
On the other hand, it is a well-known fact that the interval-valued analysis was introduced as an attempt to overcome interval uncertainty, which occurs in the computer or mathematical models of some deterministic real-word phenomena.A classic example of an interval closure is Archimedes' technique, which is associated with the computation of the circumference of a circle.In 1966, Moore [20] gave the concept of interval analysis in his book and discussed its applications in computational Mathematics.
After that, several authors have developed a strong relationship between inequalities and IVFs by means of inclusion relation via different integral operators, as one can see by Costa [21], Costa and Roman-Flores [22], Roman-Flores et al. [23,24], and Chalco-Cano et al. [25,26], but also to more general set-valued maps by Nikodem et al. [27], and Matkowski and Nikodem [28].In particular, Zhang et al. [29] derived the new version of Jensen's inequalities for set-valued and fuzzy set-valued functions by means of a pseudo order relation and proved that these Jensen's inequalities generalized a form of Costa Jensen's inequalities [21].
In the last two decades, in the development of pure and applied mathematics, fractional calculus has played a key role.Yet, it attains magnificent deliberation in the ongoing research work, which is due to its application in various directions such as image processing, signal processing, physics, biology, control theory, computer networking, and fluid dynamics [30][31][32][33].
As a further extension, several authors have introduced the refinements of classical inequalities through fractional integrals and discussed their applications, such as Budak et al. [34], who established a strong relationship between fractional interval HHinequality and convex-IVF.
Inspired by the ongoing research work, we generalize the class of p-convex function known as LR-p-convex-IVF, and establish the relationship between HH-type inequalities and LR-p-convex-IVF via Katugampola fractional integral.

Preliminaries
Let R be the set of real numbers and R I be the collection of all closed and bounded intervals of R that is R I = ξ, ξ : ξ, ξ ∈ R and ξ ≤ ξ .If ξ ≥ 0, then ξ, ξ is called positive interval.The set of all positive intervals is denoted by R + I and defined as Let ∈ R and ξ be defined as Then, the addition ξ 1 + ξ 2 and Minkowski difference ξ 1 − ξ 2 for ξ 1 , ξ 2 ∈ R I are defined by and respectively.The inclusion relation "⊇" means that (ii) It can be easily seen that "≤ p " looks similar to "left and right" on the real line R, so we call "≤ p " is "left and right" (or "LR" order, in short).
The concept of Riemann integral for IVF first introduced by Moore [20] is defined as follows: is Riemann integrable over [u, ν] if and only if, f and f both are Riemann integrable over [u, ν] such that Now, we discuss the concept of Katugampola fractional integral operator for IVF.Let q ≥ 1, c ∈ R and x q c (u, ν) be the set of all complex-valued Lebesgue integrable IVFs f on [u, ν] for which the norm f X q c is defined by Katugampola [35] presented a new fractional integral to generalize the Riemann Liouville and Hadamard fractional integrals under certain conditions.
Let p, α > 0 and f ∈ L [u,ν] be the collection of all complex-valued Lebesgue integrable IVFs on [u, ν].Then, the interval left and right Katugampola fractional integrals of f ∈ L [u,ν] with order are defined by and respectively, where The concept of p-convex functions were established by Zhang and Wang [10], and a number of properties of the functions were introduced.

Definition 1. ([54]
).Let p ∈ R with p = 0.Then, the interval I is said to be p-convex if for all x, y ∈ I, ∈ [0, 1], where p = 2n + 1 and n ∈ N or p is an odd number.

LR-p-Convex Interval-Valued Functions
Now, we introduce LR-p-convex interval-valued functions.
If p = −1, then we obtain the class of harmonically convex functions, which is also a new one.
The next Theorem 2 establishes the relationship between Definition 3 and end point functions of IVFs.
From Definition 3 and order relation ≤ p , we have Then, for all x, y ∈ [u, ν] and ∈ [0, 1], we have Hence, the result follows.
If f (x) = f (x) with γ = 1 and p = 1, then p-convex-IVF reduces to the classical convex function.

Fractional Hermite-Hadamard Type Inequalities
In this section, we will prove some new Hermite-Hadamard type inequalities for LR-p-convex-IVFs by means of the pseudo order relation via Katugampola fractional integral operator.
Then, by hypothesis, we have Multiplying both sides (17) by α−1 and integrating the obtained result with respect to over (0, 1), we have From ( 18), we get and and Adding ( 21) and ( 22), we get Multiplying both sides (23) by α−1 and integrating both sides of the obtained result with respect to over (0, 1), we get From ( 20) and ( 24), (19) becomes and the theorem has been proved.

Remark 4.
Let p = 1.Then, Theorem 3 reduces to the result for LR-convex-IVF, which is also a new one: If α = 1, then Theorem 3 reduces to the result for LR-p-convex-IVF, which is also a new one: Let p = α = 1.Then, Theorem 3 reduces to the result for LR-p-convex-IVF, which is also a new one: If f = f , then we get inequality (13) from Theorem 3.
If p = 1 and f = f , then from Theorem 3, we obtain fractional HH-inequality for convex function, see [41]: If α = 1, and f = f , then Theorem 3 reduces to the result for LR-p-convex-IVF, see [10]: If α = p = 1 and f = f , then we obtain the classical inequality (1) from Theorem 3.
Example 2. Let p be an odd number, .
Then, we clearly see that . Now, we compute the following: Note that and Theorem 3 is verified.
The next Theorem 4 gives the HH-Fejér type inequality for LR-p-convex-IVFs.
R + I , p , then we have the HH-Fejér type inequality as follows: , then multiplying both sides of ( 27) by , and integrating it with respect to over [0, 1], we have Therefore, we have Now taking the multiplication of (23 , and integrating it with respect to over [0, 1], we get 1 0 Therefore, we have Combining ( 20) and ( 21), we get and the theorem has been proved.
Remark 5. Let p = 1.Then, Theorem 4 reduces to the result for LR-convex-IVF, which is also a new one: Let α = 1.Then, Theorem 4 reduces to the result for LR-p-convex-IVF, which is also a new one: Then, Theorem 4 reduces to the result for LR-convex-IVF, which is also a new one: If f = f and α = 1, then from Theorem 4, we get Theorem 5 of [39].
If W (x) = 1, then from Theorem 4, we get Theorem 3. where and From the definition of p-convex-IVFs, it follows that 0 ≤ p f (x) and 0 ≤ p g(x), then we have Similarly, we have Adding (32) and (33), we get Multiplying both sides of (34) by α−1 and integrating the obtained result with respect to over (0,1), we have Form (35), we have and From ( 36) and (37), we have and the required result has been obtained.

Example 3. Let p be an odd number
Therefore, we have and Theorem 5 has been illustrated.
where M(u, ν) and N(u, ν) are given in Theorem 5. (40) Taking both multiplications of (40) with α−1 and integrating the result with respect to over (0,1), we have  On the other hand, from (42) and taking x p = u p + (1 − )ν p and y p = (1 − )u p + ν p , we get